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Document and Entity Information Document (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Feb. 17, 2015
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Jun. 30, 2014
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| Document Information [Line Items] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | Dec. 31, 2014 | ||
| Document Fiscal Year Focus | 2014 | ||
| Document Fiscal Period Focus | Q4 | ||
| Trading Symbol | wr | ||
| Entity Registrant Name | WESTAR ENERGY INC /KS | ||
| Entity Central Index Key | 0000054507 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Common Stock, Shares Outstanding | 132,137,563 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Public Float | $ 4,936,929,569 |
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- Definition
If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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- Definition
End date of current fiscal year in the format --MM-DD. No definition available.
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- Definition
This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. No definition available.
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- Definition
This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. No definition available.
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- Details
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- Definition
The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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- Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". No definition available.
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- Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. No definition available.
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- Definition
Indicate "Yes" or "No" whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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- Definition
Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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- Definition
State aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to price at which the common equity was last sold, or average bid and asked price of such common equity, as of the last business day of registrant's most recently completed second fiscal quarter. The public float should be reported on the cover page of the registrants form 10K. No definition available.
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- Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Indicate "Yes" or "No" if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. No definition available.
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- Definition
Indicate "Yes" or "No" if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A. No definition available.
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- Definition
Trading symbol of an instrument as listed on an exchange. No definition available.
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of obligation due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The noncurrent liability recognized in the balance sheet associated with defined benefit pension plans, other post-retirement benefit plans and other general benefit plans. No definition available.
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- Definition
Total Other Assets No definition available.
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Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Allowance for doubtful accounts receivable | $ 5,309 | $ 4,596 |
| Common stock, par value | $ 5 | $ 5 |
| Common stock, shares authorized | 275,000,000 | 275,000,000 |
| Common stock, shares issued | 131,687,454 | 128,254,229 |
| Common stock, shares outstanding | 131,687,454 | 128,254,229 |
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Consolidated Statements Of Income (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| REVENUES | $ 2,601,703 | $ 2,370,654 | $ 2,261,470 |
| OPERATING EXPENSES: | |||
| Fuel and purchased power | 705,450 | 634,797 | 589,990 |
| Network Transmission Cost | 218,924 | 178,604 | 166,547 |
| Operating and maintenance | 367,188 | 359,060 | 342,055 |
| Depreciation and amortization | 286,442 | 272,593 | 270,464 |
| Selling, general and administrative | 250,439 | 224,133 | 226,012 |
| Taxes, Miscellaneous | 140,302 | 122,282 | 104,269 |
| Total Operating Expenses | 1,968,745 | 1,791,469 | 1,699,337 |
| INCOME FROM OPERATIONS | 632,958 | 579,185 | 562,133 |
| OTHER INCOME (EXPENSE): | |||
| Investment earnings | 10,622 | 10,056 | 7,411 |
| Other income | 31,522 | 35,609 | 35,378 |
| Other expense | (18,389) | (18,099) | (19,987) |
| Total Other Income (Expense) | 23,755 | 27,566 | 22,802 |
| Interest expense | 183,118 | 182,167 | 176,337 |
| INCOME BEFORE INCOME TAXES | 473,595 | 424,584 | 408,598 |
| Income tax expense | 151,270 | 123,721 | 126,136 |
| NET INCOME | 322,325 | 300,863 | 282,462 |
| Less: Net income attributable to noncontrolling interests | 9,066 | 8,343 | 7,316 |
| NET INCOME ATTRIBUTABLE TO WESTAR ENERGY | 313,259 | 292,520 | 275,146 |
| Preferred dividends | 0 | 0 | 1,616 |
| NET INCOME ATTRIBUTABLE TO COMMON STOCK | $ 313,259 | $ 292,520 | $ 273,530 |
| Basic earnings per common share | $ 2.40 | $ 2.29 | $ 2.15 |
| Diluted earnings per common share | $ 2.35 | $ 2.27 | $ 2.15 |
| AVERAGE EQUIVALENT COMMON SHARES OUTSTANDING | 130,014,941 | 127,462,994 | 126,711,869 |
| DIVIDENDS DECLARED PER COMMON SHARE | $ 1.40 | $ 1.36 | $ 1.32 |
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- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total costs of sales and operating expenses for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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| X | ||||||||||
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- Definition
The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fuel and purchased power expense incurred that are directly related to goods produced and sold. No definition available.
|
| X | ||||||||||
|
- Definition
Network Transmission Cost No definition available.
|
|
Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | |||
| Net income | $ 322,325 | $ 300,863 | $ 282,462 |
| Adjustments to reconcile net income to net cash provided by operating activities: | |||
| Depreciation and amortization | 286,442 | 272,593 | 270,464 |
| Amortization of nuclear fuel | 26,051 | 22,690 | 24,369 |
| Amortization of deferred regulatory gain from sale-leaseback | (5,495) | (5,495) | (5,495) |
| Amortization of corporate-owned life insurance | 20,202 | 15,149 | 28,792 |
| Non-cash compensation | 7,280 | 8,188 | 7,255 |
| Net deferred income taxes and credits | 151,451 | 123,307 | 126,248 |
| Stock-based compensation excess tax benefits | (875) | (576) | (1,698) |
| Allowance for equity funds used during construction | (17,029) | (14,143) | (11,706) |
| Changes in working capital items: | |||
| Accounts receivable | (17,291) | (24,649) | 2,408 |
| Fuel inventory and supplies | (8,773) | 10,124 | (19,227) |
| Prepaid expenses and other | 36,717 | (12,316) | (3,630) |
| Accounts payable | 6,189 | 7,856 | (19,161) |
| Accrued taxes | 6,596 | 14,218 | 11,937 |
| Other current liabilities | (31,624) | (52,829) | (105,169) |
| Changes in other assets | 6,378 | (4,167) | 13,015 |
| Changes in other liabilities | 35,811 | 41,990 | (1,758) |
| Cash Flows from Operating Activities | 824,355 | 702,803 | 599,106 |
| CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: | |||
| Additions to property, plant and equipment | (852,052) | (780,098) | (810,209) |
| Purchase of securities within trusts | (9,075) | (66,668) | (20,473) |
| Sale of securities within trusts | 11,125 | 81,994 | 21,604 |
| Investment in corporate-owned life insurance | (16,250) | (17,724) | (18,404) |
| Proceeds from investment in corporate-owned life insurance | 43,234 | 147,658 | 33,542 |
| Proceeds from federal grant | 0 | 876 | 4,775 |
| Investment in affiliated company | (8,000) | (4,947) | (8,669) |
| Other investing activities | (7,730) | (2,992) | 497 |
| Cash Flows used in Investing Activities | (838,748) | (641,901) | (797,337) |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | |||
| Short-term debt, net | 122,406 | (205,241) | 52,900 |
| Proceeds from long-term debt | 417,943 | 492,347 | 541,374 |
| Retirements of long-term debt | (427,500) | (100,000) | (220,563) |
| Repayment of capital leases | (3,340) | (2,995) | (2,679) |
| Borrowings against cash surrender value of corporate-owned life insurance | 59,766 | 59,565 | 67,791 |
| Repayment of borrowings against cash surrender value of corporate-owned life insurance | (41,249) | (145,418) | (34,838) |
| Stock-based compensation excess tax benefits | 875 | 576 | 1,698 |
| Preferred stock redemption | 0 | 0 | (22,567) |
| Issuance of common stock | 87,669 | 32,906 | 6,996 |
| Distributions to shareholders of noncontrolling interests | (1,030) | (2,419) | (3,295) |
| Cash dividends paid | (171,507) | (162,904) | (158,182) |
| Proceeds from (Payments for) Other Financing Activities | (2,092) | (2,719) | 0 |
| Cash Flows from (used in) Financing Activities | 14,462 | (62,244) | 200,521 |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 69 | (1,342) | 2,290 |
| CASH AND CASH EQUIVALENTS: | |||
| Beginning of period | 4,487 | 5,829 | 3,539 |
| End of period | 4,556 | 4,487 | 5,829 |
|
Variable Interest Entity [Member]
|
|||
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | |||
| Retirements of long-term debt | $ (27,479) | $ (25,942) | $ (28,114) |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred income tax expense (benefit) and income tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes. No definition available.
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other current operating liabilities not separately disclosed in the statement of cash flows. No definition available.
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the deferred gain that was recognized in the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amortization of various items related to corporate-owned life insurance policies. No definition available.
|
| X | ||||||||||
|
- Definition
The current period expense charged against earnings for the amortization of capitalized nuclear fuel used to generate electricity. No definition available.
|
| X | ||||||||||
|
- Definition
Payment of dividends or other distributions to noncontrolling interest holders. No definition available.
|
| X | ||||||||||
|
- Definition
The cash inflow from borrowings against the cash surrender value of corporate-owned life insurance polices. No definition available.
|
| X | ||||||||||
|
- Definition
The cash inflow associated with non-repayable money awarded to an entity to carry out a specific project. No definition available.
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the repayment of borrowings against the cash surrender value of corporate-owned life insurance polices. No definition available.
|
|
Consolidated Statements Of Changes In Equity (USD $)
In Thousands, except Share data |
Total
|
Cumulative Preferred Stock [Member]
|
Common Stock [Member]
|
Paid-In Capital [Member]
|
Retained Earnings [Member]
|
Noncontrolling Interests [Member]
|
|---|---|---|---|---|---|---|
| Beginning balance at Dec. 31, 2011 | $ 2,800,741 | $ 21,436 | $ 628,492 | $ 1,639,503 | $ 501,216 | $ 10,094 |
| Beginning balance, shares at Dec. 31, 2011 | 214,363 | 125,698,396 | ||||
| Net income | 282,462 | 0 | 0 | 0 | 275,146 | 7,316 |
| Issuance of stock, value | 6,996 | 0 | 1,212 | 5,784 | 0 | 0 |
| Issuance of stock, shares | 0 | 242,463 | ||||
| Issuance Of Stock For Comprensation And Reinvested Dividends, Shares | 562,889 | |||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 9,089 | 2,815 | 6,274 | |||
| Adjustments Related to Tax Withholding for Share-based Compensation | (3,490) | (3,490) | ||||
| Stock redemption, shares | (214,363) | |||||
| Stock redemption, value | (21,436) | (21,436) | ||||
| Preferred dividends | (1,616) | 0 | 0 | 0 | (1,616) | 0 |
| Dividends on common stock | (168,097) | 0 | 0 | (168,097) | 0 | |
| Amortization of restricted stock | 7,203 | 0 | 0 | 7,203 | ||
| Stock compensation and tax benefit | 1,698 | 0 | 0 | 1,698 | 0 | 0 |
| Distributions to shareholders of noncontrolling interests | (3,295) | (3,295) | ||||
| Ending balance at Dec. 31, 2012 | 2,910,255 | 0 | 632,519 | 1,656,972 | 606,649 | 14,115 |
| Ending balance, shares at Dec. 31, 2012 | 0 | 126,503,748 | ||||
| Net income | 300,863 | 0 | 0 | 292,520 | 8,343 | |
| Issuance of stock, value | 32,906 | 0 | 6,282 | 26,624 | 0 | 0 |
| Issuance of stock, shares | 0 | 1,256,391 | ||||
| Issuance Of Stock For Comprensation And Reinvested Dividends, Shares | 494,090 | |||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 9,641 | 2,470 | 7,171 | |||
| Adjustments Related to Tax Withholding for Share-based Compensation | (2,719) | (2,719) | ||||
| Preferred dividends | 0 | |||||
| Dividends on common stock | (174,393) | 0 | 0 | 0 | (174,393) | 0 |
| Amortization of restricted stock | 8,103 | 8,103 | ||||
| Stock compensation and tax benefit | 576 | (576) | ||||
| Noncontrolling Interest, Decrease from Deconsolidation | (14,282) | (14,282) | ||||
| Distributions to shareholders of noncontrolling interests | (2,419) | (2,419) | ||||
| Ending balance at Dec. 31, 2013 | 3,068,531 | 0 | 641,271 | 1,696,727 | 724,776 | 5,757 |
| Ending balance, shares at Dec. 31, 2013 | 0 | 128,254,229 | ||||
| Net income | 322,325 | 0 | 0 | 313,259 | 9,066 | |
| Issuance of stock, value | 87,669 | 0 | 15,131 | 72,538 | 0 | 0 |
| Issuance of stock, shares | 0 | 3,026,239 | ||||
| Issuance Of Stock For Comprensation And Reinvested Dividends, Shares | 406,986 | |||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 9,155 | 2,035 | 7,120 | |||
| Adjustments Related to Tax Withholding for Share-based Compensation | (2,092) | (2,092) | ||||
| Preferred dividends | 0 | |||||
| Dividends on common stock | (182,736) | 0 | 0 | 0 | (182,736) | 0 |
| Amortization of restricted stock | 7,193 | 7,193 | ||||
| Stock compensation and tax benefit | 875 | (875) | ||||
| Noncontrolling Interest, Decrease from Deconsolidation | (7,342) | (7,342) | ||||
| Distributions to shareholders of noncontrolling interests | (1,030) | (1,030) | ||||
| Stockholders' Equity, Other | (1,241) | |||||
| Ending balance at Dec. 31, 2014 | $ 3,301,307 | $ 0 | $ 658,437 | $ 1,781,120 | $ 855,299 | $ 6,451 |
| Ending balance, shares at Dec. 31, 2014 | 0 | 131,687,454 |
| X | ||||||||||
|
- Definition
The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. No definition available.
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of shares issued which are neither cancelled nor held in the treasury. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. No definition available.
|
| X | ||||||||||
|
- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Issuance Of Stock For Compensation And Reinvested Dividends No definition available.
|
| X | ||||||||||
|
- Definition
Issuance Of Stock For Comprensation And Reinvested Dividends, Shares No definition available.
|
| X | ||||||||||
|
- Definition
This element represents (i) the amount of share-based compensation recognized during the period, that is, the amount recognized as expense in the income statement, (ii) treasury stock reissued upon exercise of stock options and (iii) tax effect on stock compensation. No definition available.
|
|
Consolidated Statements Of Changes in Equity Parenthetical (Parentheticals) (USD $)
|
3 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|||||||||||
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 1.40 | $ 1.36 | $ 1.32 | ||
|
|||||||||||||||||||||
| X | ||||||||||
|
- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Description Of Business
|
12 Months Ended |
|---|---|
|
Dec. 31, 2014
|
|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Description Of Business | DESCRIPTION OF BUSINESS We are the largest electric utility in Kansas. Unless the context otherwise indicates, all references in this Annual Report on Form 10-K to "the company," "we," "us," "our" and similar words are to Westar Energy, Inc. and its consolidated subsidiaries. The term "Westar Energy" refers to Westar Energy, Inc., a Kansas corporation incorporated in 1924, alone and not together with its consolidated subsidiaries. We provide electric generation, transmission and distribution services to approximately 698,000 |
| X | ||||||||||
|
- Definition
The entire disclosure for the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Summary Of Significant Accounting Policies
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary Of Significant Accounting Policies | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation We prepare our consolidated financial statements in accordance with generally accepted accounting principles (GAAP) for the United States of America. Our consolidated financial statements include all operating divisions, majority owned subsidiaries and variable interest entities (VIEs) of which we maintain a controlling interest or are the primary beneficiary reported as a single reportable segment. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany accounts and transactions have been eliminated in consolidation. Use of Management's Estimates When we prepare our consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities, at the date of our consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. We evaluate our estimates on an ongoing basis, including those related to depreciation, unbilled revenue, valuation of investments, forecasted fuel costs included in our retail energy cost adjustment (RECA) billed to customers, income taxes, pension and post-retirement benefits, our asset retirement obligations (AROs) including the decommissioning of Wolf Creek Generating Station (Wolf Creek), environmental issues, VIEs, contingencies and litigation. Actual results may differ from those estimates under different assumptions or conditions. Regulatory Accounting We apply accounting standards that recognize the economic effects of rate regulation. Accordingly, we have recorded regulatory assets and liabilities when required by a regulatory order or based on regulatory precedent. See Note 3, "Rate Matters and Regulation," for additional information regarding our regulatory assets and liabilities. Cash and Cash Equivalents We consider investments that are highly liquid and have maturities of three months or less when purchased to be cash equivalents. Fuel Inventory and Supplies We state fuel inventory and supplies at average cost. Following are the balances for fuel inventory and supplies stated separately.
Property, Plant and Equipment We record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. We compute AFUDC by applying a composite rate to qualified construction work in progress. We credit other income (for equity funds) and interest expense (for borrowed funds) for the amount of AFUDC capitalized as construction cost on the accompanying consolidated statements of income as follows:
We charge maintenance costs and replacements of minor items of property to expense as incurred, except for maintenance costs incurred for our planned refueling and maintenance outages at Wolf Creek. As authorized by regulators, we defer and amortize to expense ratably over the period between planned outages incremental maintenance costs incurred for such outages. When a unit of depreciable property is retired, we charge to accumulated depreciation the original cost less salvage value. Depreciation We depreciate utility plant using a straight-line method. The depreciation rates are based on an average annual composite basis using group rates that approximated 2.4% in 2014, 2.5% in 2013 and 2.6% in 2012. Depreciable lives of property, plant and equipment are as follows.
Nuclear Fuel We record as property, plant and equipment our share of the cost of nuclear fuel used in the process of refinement, conversion, enrichment and fabrication. We reflect this at original cost and amortize such amounts to fuel expense based on the quantity of heat consumed during the generation of electricity as measured in millions of British thermal units (MMBtu). The accumulated amortization of nuclear fuel in the reactor was $72.3 million as of December 31, 2014, and $46.2 million as of December 31, 2013. The cost of nuclear fuel charged to fuel and purchased power expense was $27.3 million in 2014, $26.5 million in 2013 and $28.3 million in 2012. Cash Surrender Value of Life Insurance We recorded on our consolidated balance sheets in other long-term assets the following amounts related to corporate-owned life insurance (COLI) policies.
We record as income increases in cash surrender value and death benefits. We offset against policy income the interest expense that we incur on policy loans. Income from death benefits is highly variable from period to period. Revenue Recognition We record revenue at the time we deliver electricity to customers. We determine the amounts delivered to individual customers through systematic monthly readings of customer meters. At the end of each month, we estimate how much electricity we have delivered since the prior meter reading and record the corresponding unbilled revenue. Our unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. We recorded estimated unbilled revenue of $61.0 million as of December 31, 2014, and $60.1 million as of December 31, 2013. Allowance for Doubtful Accounts We determine our allowance for doubtful accounts based on the age of our receivables. We charge receivables off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment. Income Taxes We use the asset and liability method of accounting for income taxes. Under this method, we recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. We recognize the future tax benefits to the extent that realization of such benefits is more likely than not. We amortize deferred investment tax credits over the lives of the related properties as required by tax laws and regulatory practices. We recognize production tax credits in the year that electricity is generated to the extent that realization of such benefits is more likely than not. We record deferred tax assets to the extent capital losses, operating losses, or tax credits will be carried forward to future periods. However, when we believe based on available evidence that we do not, or will not, have sufficient future capital gains or taxable income in the appropriate taxing jurisdiction to realize the entire benefit during the applicable carryforward period, we record a valuation allowance against the deferred tax asset. The application of income tax law is complex. Laws and regulations in this area are voluminous and often ambiguous. Accordingly, we must make judgments regarding income tax exposure. Interpretations of and guidance surrounding income tax laws and regulations change over time. As a result, changes in our judgments can materially affect amounts we recognize in our consolidated financial statements. See Note 10, "Taxes," for additional detail on our accounting for income taxes. Sales Tax We account for the collection and remittance of sales tax on a net basis. As a result, we do not reflect sales tax in our consolidated statements of income. Earnings Per Share We have participating securities in the form of unvested restricted share units (RSUs) with nonforfeitable rights to dividend equivalents that receive dividends on an equal basis with dividends declared on common shares. As a result, we apply the two-class method of computing basic and diluted earnings per share (EPS). To compute basic EPS, we divide the earnings allocated to common stock by the weighted average number of common shares outstanding. Diluted EPS includes the effect of potential issuances of common shares resulting from our forward sale agreements and RSUs with forfeitable rights to dividend equivalents. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. The following table reconciles our basic and diluted EPS from net income.
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Supplemental Cash Flow Information
New Accounting Pronouncements We prepare our consolidated financial statements in accordance with GAAP for the United States of America. To address current issues in accounting, regulatory bodies have issued the following new accounting pronouncements that may affect our accounting and/or disclosure. Extraordinary and Unusual Items In January 2015, the Financial Accounting Standards Board (FASB) issued guidance that eliminates the accounting concept of extraordinary items. The objective of the new guidance is to reduce complexity in accounting standards while maintaining or improving the usefulness of information provided. The guidance is effective for fiscal years beginning after December 15, 2015, with early adoption permitted. We have elected to adopt effective January 1, 2015, without a material impact to our financial statements. Revenue Recognition In May 2014, the FASB issued guidance that addresses revenue from contracts with customers. The objective of the new guidance is to establish principles to report useful information to users of financial statements about the nature, amount, timing and uncertainty of revenue from contracts with customers. This guidance is effective for fiscal years beginning after December 15, 2016. Early application of the standard is not permitted. The standard permits the use of either the retrospective application or cumulative effect transition method. We have not yet selected a transition method or determined the impact on our consolidated financial statements but we do not expect it to be material. |
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The entire disclosure for all significant accounting policies of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Rate Matters And Regulation
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| Regulated Operations [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Rate Matters And Regulation | RATE MATTERS AND REGULATION Regulatory Assets and Regulatory Liabilities Regulatory assets represent incurred costs that have been deferred because they are probable of future recovery in customer prices. Regulatory liabilities represent probable future reductions in revenue or refunds to customers through the price setting process. Regulatory assets and liabilities reflected on our consolidated balance sheets are as follows.
Below we summarize the nature and period of recovery for each of the regulatory assets listed in the table above.
Below we summarize the nature and period of amortization for each of the regulatory liabilities listed in the table above.
KCC Proceedings General and Abbreviated Rate Reviews We, staff of the Kansas Corporation Commission (KCC) and a consumer advocate joined in a request filed with the KCC to defer depreciation expense and carrying costs related to our capital investment associated with environmental upgrades at La Cygne until new retail prices become effective following a general rate case expected to be filed in March 2015. We estimate our share of these deferred costs will be approximately $20.0 million and we expect to begin deferring these costs in March 2015. In September 2014, the KCC issued an order approving the joint application that will allow us to include these deferred costs in our next general rate case, which is expected to increase our annual revenues by approximately $4.0 million. In November 2013, the KCC issued an order allowing us to adjust our prices to include the additional investment in the La Cygne environmental upgrades, as discussed below, and to reflect cost reductions elsewhere. The new prices were expected to increase our annual retail revenues by approximately $30.7 million. In April 2012, the KCC issued an order expected to increase our annual retail revenues by approximately $50.0 million. In addition, we revised our depreciation rates to reflect changes in the estimated useful lives of some of our depreciable assets. The change in estimate decreased annual depreciation expense by $43.6 million. The new prices were effective shortly after having received the order. Environmental Costs In August 2011, the KCC issued an order ruling that Kansas City Power & Light Company's (KCPL) decision to make environmental upgrades at La Cygne to comply with environmental regulations is prudent and the $1.2 billion project cost estimate is reasonable. We have a 50% interest in La Cygne and intervened in the proceeding. The KCC denied our request to collect our approximately $610.0 million share of the capital investment for the environmental upgrades through our environmental cost recovery rider (ECRR). However, as noted above, we received an order regarding an abbreviated rate review to update our prices to include a portion of the capital costs associated with the project. We will request to collect our remaining investment in La Cygne environmental upgrades as part of a general rate case expected to be filed in March 2015. We also make annual filings with the KCC to adjust our prices to include costs associated with investments in air quality equipment made during the prior year. In the most recent three years, the KCC issued orders related to such filings allowing us to increase our annual retail revenues by approximately:
Transmission Costs We make annual filings with the KCC to adjust our prices to include updated transmission costs as reflected in our transmission formula rate discussed below. In the most recent three years, the KCC issued orders related to such filings allowing us to increase our annual retail revenues by approximately:
Energy Efficiency We make annual filings with the KCC to adjust our prices to include previously deferred amounts associated with various energy efficiency programs. In the most recent three years, the KCC issued orders related to such filings authorizing us to adjust our annual retail revenues by approximately:
Property Tax Surcharge We make annual filings with the KCC to adjust our prices to include the cost incurred for property taxes. In the most recent three years, the KCC issued orders related to such filings allowing us to increase our annual retail revenues by approximately:
FERC Proceedings In October of each year, we post an updated transmission formula rate that includes projected transmission capital expenditures and operating costs for the following year. This rate provides the basis for our annual request with the KCC to adjust our retail prices to include updated transmission costs as noted above. In the most recent three years, we posted our transmission formula rate which was expected to increase our annual transmission revenues by approximately:
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| Financial And Derivative Instruments and Trading Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management | FINANCIAL INSTRUMENTS AND TRADING SECURITIES Values of Financial and Derivative Instruments GAAP establishes a hierarchical framework for disclosing the transparency of the inputs utilized in measuring assets and liabilities at fair value. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy levels. The three levels of the hierarchy and examples are as follows:
We record cash and cash equivalents, short-term borrowings and variable rate debt on our consolidated balance sheets at cost, which approximates fair value. We measure the fair value of fixed rate debt, a level 2 measurement, based on quoted market prices for the same or similar issues or on the current rates offered for instruments of the same remaining maturities and redemption provisions. The recorded amount of accounts receivable and other current financial instruments approximates fair value. All of our level 2 investments are held in investment funds that are measured at fair value using daily net asset values. In addition, we maintain certain level 3 investments in private equity, alternative investments and real estate securities that are also measured at fair value using net asset value, but require significant unobservable market information to measure the fair value of the underlying investments. The underlying investments in private equity are measured at fair value utilizing both market- and income-based models, public company comparables, investment cost or the value derived from subsequent financings. Adjustments are made when actual performance differs from expected performance; when market, economic or company-specific conditions change; and when other news or events have a material impact on the security. The underlying alternative investments include collateralized debt obligations, mezzanine debt and a variety of other investments. The fair value of these investments is measured using a variety of primarily market-based models utilizing inputs such as security prices, maturity, call features, ratings and other developments related to specific securities. The underlying real estate investments are measured at fair value using a combination of market- and income-based models utilizing market discount rates, projected cash flows and the estimated value into perpetuity. We measure fair value based on information available as of the measurement date. The following table provides the carrying values and measured fair values of our fixed-rate debt.
Recurring Fair Value Measurements The following table provides the amounts and their corresponding level of hierarchy for our assets that are measured at fair value.
The following table provides reconciliations of assets held in the NDT measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
Portions of the gains and losses contributing to changes in net assets in the above table are unrealized. The following table summarizes the unrealized gains and losses we recorded to regulatory liabilities on our consolidated financial statements during the years ended December 31, 2014 and 2013, attributed to level 3 assets and liabilities.
Some of our investments in the NDT and our trading securities portfolio are measured at net asset value, do not have readily determinable fair values and are either with investment companies or companies that follow accounting guidance consistent with investment companies. In certain situations these investments may have redemption restrictions. The following table provides additional information on these investments.
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Derivative Instruments Cash Flow Hedges In 2011, we entered into treasury yield hedge transactions to hedge our interest rate risk associated with a $125.0 million portion of a forecasted issuance of fixed rate debt. These transactions were designated and qualified as cash flow hedges and measured at fair value by estimating the net present value of a series of payments using market-based models with observable inputs such as the spread between the 30-year U.S Treasury bill yield and the contracted, fixed yield. As a result of regulatory accounting treatment, we report the effective portion of the gains or losses on these derivative instruments as a regulatory liability or regulatory asset and amortize such amounts to interest expense over the term of the related debt. In 2012, we settled the treasury yield hedge transactions for a cost of $29.7 million, which will be amortized to interest expense over the 30-year term of the debt issued in March 2012. See Note 9, "Long-Term Debt" for additional information regarding the debt issuance. As of December 31, 2014 and 2013, we had recorded $26.6 million and $27.6 million, respectively, as a regulatory asset. Price Risk We use various types of fuel, including coal, natural gas, uranium and diesel to operate our plants and also purchase power to meet customer demand. Our prices and consolidated financial results are exposed to market risks from commodity price changes for electricity and other energy-related products as well as from interest rates. Volatility in these markets impacts our costs of purchased power, costs of fuel for our generating plants and our participation in energy markets. We strive to manage our customers' and our exposure to these market risks through regulatory, operating and financing activities and, when we deem appropriate, we economically hedge a portion of these risks through the use of derivative financial instruments for non-trading purposes. Interest Rate Risk We have entered into numerous fixed and variable rate debt obligations. For details, see Note 9, "Long-Term Debt." We manage our interest rate risk related to these debt obligations by limiting our exposure to variable interest rate debt, diversifying maturity dates and entering into treasury yield hedge transactions. We may also use other financial derivative instruments such as interest rate swaps. |
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| Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Investments | FINANCIAL INVESTMENTS We report our investments in equity and debt securities at fair value and use the specific identification method to determine their realized gains and losses. We classify these investments as either trading securities or available-for-sale securities as described below. Trading Securities We hold equity and debt investments which we classify as trading securities in a trust used to fund certain retirement benefit obligations. These obligations totaled $29.8 million and $27.0 million as of December 31, 2014 and 2013, respectively. For additional information on our benefit obligations, see Note 11, "Employee Benefit Plans." As of December 31, 2014 and 2013, we measured the fair value of trust assets at $35.5 million and $34.9 million, respectively. We include unrealized gains or losses on these securities in investment earnings on our consolidated statements of income. For the years ended December 31, 2014, 2013 and 2012, we recorded unrealized gains of $2.6 million, $6.7 million and $4.1 million, respectively. Available-for-Sale Securities We hold investments in a trust for the purpose of funding the decommissioning of Wolf Creek. We have classified these investments as available-for-sale and have recorded all such investments at their fair market value as of December 31, 2014 and 2013. Using the specific identification method to determine cost, we realized gains on our available-for-sale securities of $0.1 million in 2014, $5.3 million in 2013 and $0.6 million in 2012. We record net realized and unrealized gains and losses in regulatory liabilities on our consolidated balance sheets. This reporting is consistent with the method we use to account for the decommissioning costs we recover in our prices. Gains or losses on assets in the trust fund are recorded as increases or decreases, respectively, to regulatory liabilities and could result in lower or higher funding requirements for decommissioning costs, which we believe would be reflected in the prices paid by our customers. The following table presents the cost, gross unrealized gains and losses, fair value and allocation of investments in the NDT fund as of December 31, 2014 and 2013.
The following table presents the fair value and the gross unrealized losses of the available-for-sale securities held in the NDT fund aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2014 and 2013.
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Disclosure related to investments in certain debt and equity securities classified as either trading securities or available-for-sale securities. No definition available.
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Property, Plant And Equipment
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| Public Utilities, Property, Plant and Equipment [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, Plant and Equipment | PROPERTY, PLANT AND EQUIPMENT The following is a summary of our property, plant and equipment balance.
The following is a summary of property, plant and equipment of VIEs.
We revised our depreciation rates to reflect changes in the estimated useful lives of some of our assets in 2012. We recorded depreciation expense on property, plant and equipment of $263.8 million in 2014, $249.9 million in 2013 and $247.8 million in 2012. Approximately $9.7 million, $9.7 million and $9.8 million of depreciation expense in 2014, 2013 and 2012, respectively, was attributable to property, plant and equipment of VIEs. |
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The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Joint Ownership of Utility Plants
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| Joint Ownership of Utility Plants | JOINT OWNERSHIP OF UTILITY PLANTS Under joint ownership agreements with other utilities, we have undivided ownership interests in four electric generating stations. Energy generated and operating expenses are divided on the same basis as ownership with each owner reflecting its respective costs in its statements of income and each owner responsible for its own financing. Information relative to our ownership interests in these facilities as of December 31, 2014, is shown in the table below.
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(c) Jointly owned with Empire District Electric Company. We include in operating expenses on our consolidated statements of income our share of operating expenses of the above plants. Our share of fuel expense for the above plants is generally based on the amount of power we take from the respective plants. Our share of other transactions associated with the plants is included in the appropriate classification on our consolidated financial statements. In addition, we also consolidate a VIE that holds our 50% leasehold interest in La Cygne unit 2, which represents 341 MW of net capacity. The VIE's investment in the 50% interest was $392.1 million and accumulated depreciation was $194.5 million as of December 31, 2014. We include these amounts in property, plant and equipment of VIEs, net on our consolidated balance sheets. See Note 17, "Variable Interest Entities," for additional information about VIEs. |
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- Definition
Joint Ownership Of Utility Plants [Text Block] No definition available.
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Short-Term Debt
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Dec. 31, 2014
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| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Short-Term Debt | SHORT-TERM DEBT In September 2014, Westar Energy extended the term of its $730.0 million revolving credit facility to terminate in September 2018, $81.4 million of which will expire in September 2017. As long as there is no default under the facility, Westar Energy may extend the facility up to an additional two years and may increase the aggregate amount of borrowings under the facility to $1.0 billion, both subject to lender participation. All borrowings under the facility are secured by KGE first mortgage bonds. As of December 31, 2014, no amounts had been borrowed and $15.6 million of letters of credit had been issued under this revolving credit facility. As of December 31, 2013, no amounts had been borrowed and $18.4 million of letters of credit had been issued under this revolving credit facility. In 2011, Westar Energy entered into a revolving credit facility with a syndicate of banks for $270.0 million. In February 2014, Westar Energy extended the term of the $270.0 million revolving credit facility to February 2017, of which $20.0 million of this facility will terminate in February 2016. So long as there is no default under the facility, Westar Energy may increase the aggregate amount of borrowings under the facility to $400.0 million, subject to lender participation. All borrowings under the facility are secured by KGE first mortgage bonds. As of December 31, 2014 and 2013, Westar Energy had no borrowed amounts or letters of credit outstanding under this revolving credit facility. Westar Energy maintains a commercial paper program pursuant to which it may issue commercial paper up to a maximum aggregate amount outstanding at any one time of $1.0 billion. This program is supported by Westar Energy's revolving credit facilities. Maturities of commercial paper issuances may not exceed 365 days from the date of issuance and proceeds from such issuances will be used to temporarily fund capital expenditures, to redeem debt on an interim basis, for working capital and/or for other general corporate purposes. Westar Energy had $257.6 million and $134.6 million of commercial paper issued and outstanding as of December 31, 2014 and 2013, respectively. In addition, total combined borrowings under Westar Energy's commercial paper program and revolving credit facilities may not exceed $1.0 billion at any given time. The weighted average interest rate on short-term borrowings outstanding as of December 31, 2014 and 2013, was 0.52% and 0.28%, respectively. Additional information regarding our short-term debt is as follows.
Our interest expense on short-term debt was $2.0 million in 2014, $2.4 million in 2013 and $3.2 million in 2012. |
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The entire disclosure for short-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt
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Dec. 31, 2014
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| Long-term Debt, Unclassified [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt | LONG-TERM DEBT Outstanding Debt The following table summarizes our long-term debt outstanding.
_______________ (a) We amortize debt discounts and premiums to interest expense over the term of the respective issues. (b) Portions of our payments related to this debt reduce the principal balances each year until maturity. The Westar Energy and KGE mortgages each contain provisions restricting the amount of first mortgage bonds that could be issued by each entity. We must comply with such restrictions prior to the issuance of additional first mortgage bonds or other secured indebtedness. The amount of Westar Energy first mortgage bonds authorized by its Mortgage and Deed of Trust, dated July 1, 1939, as supplemented, is subject to certain limitations as described below. The amount of KGE first mortgage bonds authorized by the KGE Mortgage and Deed of Trust, dated April 1, 1940, as supplemented and amended, is limited to a maximum of $3.5 billion, unless amended further. First mortgage bonds are secured by utility assets. Amounts of additional bonds that may be issued are subject to property, earnings and certain restrictive provisions, except in connection with certain refundings, of each mortgage. As of December 31, 2014, approximately $743.2 million principal amount of additional first mortgage bonds could be issued under the most restrictive provisions in Westar Energy's mortgage. As of December 31, 2014, approximately $1.3 billion principal amount of additional KGE first mortgage bonds could be issued under the most restrictive provisions in KGE's mortgage. As of December 31, 2014, we had $121.9 million of variable rate, tax-exempt bonds. While the interest rates for these bonds have been extremely low, we continue to monitor the credit markets and evaluate our options with respect to these bonds. In January 2015, Westar Energy redeemed $125.0 million in principal amount of first mortgage bonds bearing stated interest at 5.95% and maturing January 2035. In July 2014, KGE issued $250.0 million in principal amount of first mortgage bonds bearing stated interest at 4.30% and maturing July 2044, the proceeds of which were used to retire Westar Energy first mortgage bonds in a principal amount of $250.0 million with a stated interest of 6.00% maturing in July 2014. In May 2014, Westar Energy issued $180.0 million in principal amount of first mortgage bonds bearing stated interest at 4.10% and maturing April 2043. These bonds constitute a further issuance of a series of bonds initially issued in March 2013 in a principal amount of $250.0 million. Proceeds from the May 2014 issuance were used in June 2014 to redeem three KGE pollution control bond series totaling $177.5 million principal amount at stated interest rates between 5.00% and 5.30%. In August 2013, Westar Energy issued $250.0 million principal amount of first mortgage bonds bearing stated interest at 4.625% and maturing September 2043. In June 2013, KGE redeemed two pollution control bond series with a principal amount of $100.0 million and stated interest rates at 5.60% and 6.00%. In March 2013, Westar Energy issued $250.0 million principal amount of first mortgage bonds bearing stated interest at 4.10% and maturing April 2043. Proceeds from issuances were used to repay short-term debt, which was used to purchase capital equipment, to redeem bonds and for working capital and general corporate purposes. Maturities The principal amounts of our long-term debt maturities as of December 31, 2014, are as follows.
Interest expense on long-term debt was $158.8 million in 2014, $154.9 million in 2013 and $145.6 million in 2012. Interest expense on long-term debt of VIEs was $11.4 million in 2014, $13.0 million in 2013 and $15.1 million in 2012. |
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The entire disclosure for long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes
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Dec. 31, 2014
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Taxes | TAXES Income tax expense is comprised of the following components.
Deferred tax assets and liabilities are reflected on our consolidated balance sheets as follows.
The tax effect of the temporary differences and carryforwards that comprise our deferred tax assets and deferred tax liabilities are summarized in the following table.
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In accordance with various orders, we have reduced our prices to reflect the income tax benefits associated with certain accelerated income tax deductions. We believe it is probable that the net future increases in income taxes payable will be recovered from customers when these temporary income tax benefits reverse. We have recorded a regulatory asset for these amounts. We also have recorded a regulatory liability for our obligation to reduce the prices charged to customers for deferred income taxes recovered from customers at corporate income tax rates higher than current income tax rates. The price reduction will occur as the temporary differences resulting in the excess deferred income tax liabilities reverse. The income tax-related regulatory assets and liabilities as well as unamortized investment tax credits are also temporary differences for which deferred income taxes have been provided. The net deferred income tax liability related to these temporary differences is classified above as amounts due from customers for future income taxes, net. Our effective income tax rates are computed by dividing total federal and state income taxes by the sum of such taxes and net income. The difference between the effective income tax rates and the federal statutory income tax rates are as follows.
We file income tax returns in the U.S. federal jurisdiction as well as various state and foreign jurisdictions. The income tax returns we file will likely be audited by the Internal Revenue Service (IRS) or other tax authorities. With few exceptions, the statute of limitations with respect to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities remains open for tax year 2011 and forward. Effective January 1, 2014, we adopted new regulations released by the IRS and United States Treasury Department regarding the deduction and capitalization of expenditures related to tangible property, including the tax treatment of, among other things, materials and supplies and the determination of whether expenditures with respect to tangible property are a deductible repair or must be capitalized, and regulations regarding dispositions of property under the Modified Accelerated Cost Recovery System. The adoption of these regulations did not have a material impact on our consolidated financial results. Additionally, also effective January 1, 2014, we implemented new FASB accounting guidance regarding the presentation of an unrecognized tax benefit. An unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, similar tax loss, or a tax credit carryforward. To the extent such tax assets are not available to settle any additional income taxes that would result from the disallowance of a tax position at the reporting date, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. We adopted this guidance with retrospective application to prior periods and it did not have a material impact on our consolidated financial statements. The unrecognized income tax benefits increased from $1.7 million at December 31, 2013, to $3.2 million at December 31, 2014. The increase for unrecognized income tax benefits was largely attributable to tax positions taken with respect to research and experimental tax credits. We do not expect significant changes in the unrecognized income tax benefits in the next 12 months. A reconciliation of the beginning and ending amounts of unrecognized income tax benefits is as follows:
The amounts of unrecognized income tax benefits that, if recognized, would favorably impact our effective income tax rate, were $3.2 million, $2.4 million and $2.0 million (net of tax) as of December 31, 2014, 2013 and 2012, respectively. Interest related to income tax uncertainties is classified as interest expense and accrued interest liability. As of December 31, 2014, we had no amounts accrued for interest related to unrecognized income tax benefits, compared to $0.2 million as of December 31, 2013. We accrued no penalties at either December 31, 2014 or 2013. As of December 31, 2014 and 2013, we had recorded $1.5 million for probable assessments of taxes other than income taxes. |
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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Compensation and Retirement Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Employee Benefit Plans | EMPLOYEE BENEFIT PLANS Pension and Post-Retirement Benefit Plans We maintain a qualified non-contributory defined benefit pension plan covering substantially all of our employees. For the majority of our employees, pension benefits are based on years of service and an employee's compensation during the 60 highest paid consecutive months out of 120 before retirement. Non-union employees hired after December 31, 2001, and union employees hired after December 31, 2011, are covered by the same defined benefit pension plan; however, their benefits are derived from a cash balance account formula. We also maintain a non-qualified Executive Salary Continuation Plan for the benefit of certain retired executive officers. We have discontinued accruing any future benefits under this non-qualified plan. The amount we contribute to our pension plan for future periods is not yet known, however, we expect to fund our pension plan each year at least to a level equal to current year pension expense. We must also meet minimum funding requirements under the Employee Retirement Income Security Act, as amended by the Pension Protection Act. We may contribute additional amounts from time to time as deemed appropriate. In addition to providing pension benefits, we provide certain post-retirement health care and life insurance benefits for substantially all retired employees. We accrue and recover in our prices the costs of post-retirement benefits during an employee's years of service. In 2014 and prior years, our retirees were covered under a health insurance policy. In January 2015, we began giving our retirees a fixed annual allowance, which provides them the flexibility to obtain health coverage in the marketplace that is tailored to their needs. As a co-owner of Wolf Creek, KGE is indirectly responsible for 47% of the liabilities and expenses associated with the Wolf Creek pension and post-retirement benefit plans. See Note 12, "Wolf Creek Employee Benefit Plans," for information about Wolf Creek's benefit plans. The following tables summarize the status of our pension and post-retirement benefit plans.
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We use a measurement date of December 31 for our pension and post-retirement benefit plans. The discount rate used to determine the current year pension obligation and the following year's pension expense is based on a bond selection-settlement portfolio approach. This approach develops a discount rate by selecting a portfolio of high quality, non-callable corporate bonds that generate sufficient cash flow to provide for the projected benefit payments of the plan. After the bond portfolio is selected, a single interest rate is determined that equates the present value of the plan's projected benefit payments discounted at this rate with the market value of the bonds selected. The decrease in the discount rates used as of December 31, 2014, increased the pension and post-retirement benefit obligations by approximately $123.5 million and $11.2 million, respectively. We utilize actuarial assumptions about mortality to calculate the pension and post-retirement benefit obligations. In 2014, revised mortality tables were published which reflect improved life expectancies based on past experience and future projections. We adopted the revised mortality tables as of December 31, 2014, resulting in an increase to the pension and post-retirement benefit obligations by approximately $58.6 million and $5.9 million, respectively. We amortize prior service cost on a straight-line basis over the average future service of the active employees (plan participants) benefiting under the plan at the time of the amendment. We amortize the net actuarial gain or loss on a straight-line basis over the average future service of active plan participants benefiting under the plan without application of an amortization corridor. The KCC allows us to record a regulatory asset or liability to track the cumulative difference between current year pension and post-retirement benefits expense and the amount of such expense recognized in setting our prices. We accumulate such regulatory asset or liability between general rate reviews and amortize the accumulated amount as part of resetting our base prices. Following is additional information regarding our pension and post-retirement benefit plans.
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We estimate that we will amortize the following amounts from regulatory assets into net periodic cost in 2015.
We base the expected long-term rate of return on plan assets on historical and projected rates of return for current and planned asset classes in the plans' investment portfolios. We select assumed projected rates of return for each asset class after analyzing long-term historical experience and future expectations of the volatility of the various asset classes. Based on target asset allocations for each asset class, we develop an overall expected rate of return for the portfolios, adjusted for historical and expected experience of active portfolio management results compared to benchmark returns and for the effect of expenses paid from plan assets. For measurement purposes, the assumed annual health care cost growth rates were as follows.
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The health care cost trend rate affects the projected benefit obligation. A 1% change in assumed health care cost growth rates would have effects shown in the following table.
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Plan Assets We believe we manage pension and post-retirement benefit plan assets in a prudent manner with regard to preserving principal while providing reasonable returns. We have adopted a long-term investment horizon such that the chances and duration of investment losses are weighed against the long-term potential for appreciation of assets. Part of our strategy includes managing interest rate sensitivity of plan assets relative to the associated liabilities. The primary objective of the pension plan is to provide a source of retirement income for its participants and beneficiaries, and the primary financial objective of the plan is to improve its funded status. The primary objective of the post-retirement benefit plan is growth in assets and preservation of principal, while minimizing interim volatility, to meet anticipated claims of plan participants. We delegate the management of our pension and post-retirement benefit plan assets to independent investment advisors who hire and dismiss investment managers based upon various factors. The investment advisors are instructed to diversify investments across asset classes, sectors and manager styles to minimize the risk of large losses, based upon objectives and risk tolerance specified by management, which include allowable and/or prohibited investment types. We measure and monitor investment risk on an ongoing basis through quarterly investment portfolio reviews and annual liability measurements. We have established certain prohibited investments for our pension and post-retirement benefit plans. Such prohibited investments include loans to the company or its officers and directors as well as investments in the company's debt or equity securities, except as may occur indirectly through investments in diversified mutual funds. In addition, to reduce concentration of risk, the pension plan will not invest in any fund that holds more than 25% of its total assets to be invested in the securities of one or more issuers conducting their principal business activities in the same industry. This restriction does not apply to investments in securities issued or guaranteed by the U.S. government or its agencies. Target allocations for our pension plan assets are approximately 39% to debt securities, 39% to equity securities, 12% to alternative investments such as real estate securities, hedge funds and private equity investments, and the remaining 10% to a fund which provides tactical portfolio overlay by investing in debt and equity securities. Our investments in equity include investment funds with underlying investments in domestic and foreign large-, mid- and small-cap companies, derivatives related to such holdings, private equity investments including late-stage venture investments and other investments. Our investments in debt include core and high-yield bonds. Core bonds are comprised of investment funds with underlying investments in investment grade debt securities of corporate entities, obligations of U.S. and foreign governments and their agencies and other debt securities. High-yield bonds include investment funds with underlying investments in non-investment grade debt securities of corporate entities, obligations of foreign governments and their agencies, private debt securities and other debt securities. Real estate securities consist primarily of funds invested in core real estate throughout the U.S. while alternative funds invest in wide ranging investments including equity and debt securities of domestic and foreign corporations, debt securities issued by U.S. and foreign governments and their agencies, structured debt, warrants, exchange-traded funds, derivative instruments, private investment funds and other investments. Target allocations for our post-retirement benefit plan assets are 65% to equity securities and 35% to debt securities. Our investments in equity securities include investment funds with underlying investments primarily in domestic and foreign large-, mid- and small-cap companies. Our investments in debt securities include a core bond fund with underlying investments in investment grade debt securities of domestic and foreign corporate entities, obligations of U.S. and foreign governments and their agencies, private placement securities and other investments. Similar to other assets measured at fair value, GAAP establishes a hierarchal framework for disclosing the transparency of the inputs utilized in measuring pension and post-retirement benefit plan assets at fair value. From time to time, the pension and post-retirement benefits trusts may buy and sell investments resulting in changes within the hierarchy. See Note 4, "Financial Instruments and Trading Securities," for a description of the hierarchal framework. All level 2 pension investments are held in investment funds that are measured at fair value using daily net asset values as reported by the trustee, except for $59.0 million as of December 31, 2014, invested directly in long-term U.S. Treasury securities. We also maintain certain level 3 investments in private equity, alternative investments and real estate securities that are also measured at fair value using net asset value, but require significant unobservable market information to measure the fair value of the underlying investments. The underlying investments in private equity are measured at fair value utilizing both market- and income-based models, public company comparables, investment cost or the value derived from subsequent financings. Adjustments are made when actual performance differs from expected performance; when market, economic or company-specific conditions change; and when other news or events have a material impact on the security. The underlying alternative investments include collateralized debt obligations, mezzanine debt and a variety of other investments. The fair value of these investments is measured using a variety of primarily market-based models utilizing inputs such as security prices, maturity, call features, ratings and other developments related to specific securities. The underlying real estate investments are measured at fair value using a combination of market- and income-based models utilizing market discount rates, projected cash flows and the estimated value into perpetuity. The following table provides the fair value of our pension plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
The following table provides a reconciliation of pension plan assets measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
The following table provides the fair value of our post-retirement benefit plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
Cash Flows The following table shows the expected cash flows for our pension and post-retirement benefit plans for future years.
Savings Plans We maintain a qualified 401(k) savings plan in which most of our employees participate. We match employees' contributions in cash up to specified maximum limits. Our contributions to the plan are deposited with a trustee and invested at the direction of plan participants into one or more of the investment alternatives we provide under the plan. Our contributions totaled $7.0 million in 2014, $6.9 million in 2013 and $7.1 million in 2012. Stock-Based Compensation Plans We have a long-term incentive and share award plan (LTISA Plan), which is a stock-based compensation plan in which employees and directors are eligible for awards. The LTISA Plan was implemented as a means to attract, retain and motivate employees and directors. Under the LTISA Plan, we may grant awards in the form of stock options, dividend equivalents, share appreciation rights, RSUs, performance shares and performance share units to plan participants. Up to 8.25 million shares of common stock may be granted under the LTISA Plan. As of December 31, 2014, awards of approximately 5.0 million shares of common stock had been made under the plan. All stock-based compensation is measured at the grant date based on the fair value of the award and is recognized as an expense in the consolidated statement of income over the requisite service period. The requisite service periods range from one to ten years. The table below shows compensation expense and income tax benefits related to stock-based compensation arrangements that are included in our net income.
We use RSU awards for our stock-based compensation awards. RSU awards are grants that entitle the holder to receive shares of common stock as the awards vest. These RSU awards are defined as nonvested shares and do not include restrictions once the awards have vested. RSU awards with only service requirements vest solely upon the passage of time. We measure the fair value of these RSU awards based on the market price of the underlying common stock as of the grant date. RSU awards with only service conditions that have a graded vesting schedule are recognized as an expense in the consolidated statement of income on a straight-line basis over the requisite service period for the entire award. Nonforfeitable dividend equivalents, or the rights to receive cash equal to the value of dividends paid on Westar Energy's common stock, are paid on these RSUs during the vesting period. RSU awards with performance measures vest upon expiration of the award term. The number of shares of common stock awarded upon vesting will vary from 0% to 200% of the RSU award, with performance tied to our total shareholder return relative to the total shareholder return of our peer group. We measure the fair value of these RSU awards using a Monte Carlo simulation technique that uses the closing stock price at the valuation date and incorporates assumptions for inputs of the expected volatility and risk-free interest rates. Expected volatility is based on historical volatility over three years using daily stock price observations. The risk-free interest rate is based on treasury constant maturity yields as reported by the Federal Reserve and the length of the performance period. For the 2014 valuation, inputs for expected volatility ranged from 15.2% to 23.3% and the risk-free interest rate was approximately 0.3%. For the 2013 valuation, inputs for expected volatility ranged from 15.0% to 23.5% and the risk-free interest rate was approximately 0.3%. For these RSU awards, dividend equivalents accumulate over the vesting period and are paid in cash based on the number of shares of common stock awarded upon vesting. During the years ended December 31, 2014, 2013 and 2012, our RSU activity for awards with only service requirements was as follows.
Total unrecognized compensation cost related to RSU awards with only service requirements was $4.4 million and $4.4 million as of December 31, 2014 and 2013, respectively. We expect to recognize these costs over a remaining weighted-average period of 1.9 years. The total fair value of RSUs with only service requirements that vested during the years ended December 31, 2014, 2013 and 2012, was $3.9 million, $3.7 million and $3.7 million, respectively. During the years ended December 31, 2014, 2013 and 2012, our RSU activity for awards with performance measures was as follows.
As of December 31, 2014 and 2013, total unrecognized compensation cost related to RSU awards with performance measures was $3.8 million and $4.0 million, respectively. We expect to recognize these costs over a remaining weighted-average period of 1.7 years. The total fair value of RSUs with performance measures that vested during the years ended December 31, 2014, 2013 and 2012, was $0.5 million, $2.3 million and $3.6 million, respectively. Another component of the LTISA Plan is the Executive Stock for Compensation program under which, in the past, eligible employees were entitled to receive deferred common stock in lieu of current cash compensation. Although this plan was discontinued in 2001, dividends will continue to be paid to plan participants on their outstanding plan balance until distribution. Plan participants were awarded 403 shares of common stock for dividends in 2014, 551 shares in 2013 and 666 shares in 2012. Participants received common stock distributions of 1,944 shares in 2014, 3,456 shares in 2013 and 1,461 shares in 2012. Income tax benefits resulting from income tax deductions in excess of the related compensation cost recognized in the financial statements is classified as cash flows from financing activities in the consolidated statements of cash flows. |
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The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Wolf Creek Employee Benefit Plans
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Wolf Creek Employee Benefit Plans | WOLF CREEK EMPLOYEE BENEFIT PLANS Pension and Post-retirement Benefit Plans As a co-owner of Wolf Creek, KGE is indirectly responsible for 47% of the liabilities and expenses associated with the Wolf Creek pension and post-retirement benefit plans. KGE accrues its 47% share of Wolf Creek's cost of pension and post-retirement benefits during the years an employee provides service. The following tables summarize the status of KGE's 47% share of the Wolf Creek pension and post-retirement benefit plans.
Wolf Creek uses a measurement date of December 31 for its pension and post-retirement benefit plans. The discount rate used to determine the current year pension obligation and the following year's pension expense is based on a bond selection-settlement portfolio approach. This approach develops a discount rate by selecting a portfolio of high quality, non-callable corporate bonds that generate sufficient cash flow to provide for the projected benefit payments of the plan. After the bond portfolio is selected, a single interest rate is determined that equates the present value of the plan's projected benefit payments discounted at this rate with the market value of the bonds selected. The decrease in the discount rates used as of December 31, 2014, increased Wolf Creek's pension and post-retirement benefit obligations by approximately $26.9 million and $0.6 million, respectively. Wolf Creek utilizes actuarial assumptions about mortality to calculate the pension and post-retirement benefit obligations. In 2014, revised mortality tables were published which reflect improved life expectancies based on past experience and future projections. Wolf Creek adopted the revised mortality tables as of December 31, 2014, resulting in an increase to the pension and post-retirement benefit obligations by approximately $11.3 million and $0.2 million, respectively. The prior service cost (benefit) is amortized on a straight-line basis over the average future service of the active employees (plan participants) benefiting under the plan at the time of the amendment. The net actuarial gain or loss is amortized on a straight-line basis over the average future service of active plan participants benefiting under the plan without application of an amortization corridor. Following is additional information regarding KGE's 47% share of the Wolf Creek pension and other post-retirement benefit plans.
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We estimate that we will amortize the following amounts from regulatory assets into net periodic cost in 2015.
The expected long-term rate of return on plan assets is based on historical and projected rates of return for current and planned asset classes in the plans' investment portfolios. Assumed projected rates of return for each asset class were selected after analyzing long-term historical experience and future expectations of the volatility of the various asset classes. Based on target asset allocations for each asset class, the overall expected rate of return for the portfolios was developed, adjusted for historical and expected experience of active portfolio management results compared to benchmark returns and for the effect of expenses paid from plan assets. For measurement purposes, the assumed annual health care cost growth rates were as follows.
The health care cost trend rate affects the projected benefit obligation. A 1% change in assumed health care cost growth rates would have effects shown in the following table.
Plan Assets Wolf Creek's pension and post-retirement plan investment strategy is to manage assets in a prudent manner with regard to preserving principal while providing reasonable returns. It has adopted a long-term investment horizon such that the chances and duration of investment losses are weighed against the long-term potential for appreciation of assets. Part of its strategy includes managing interest rate sensitivity of plan assets relative to the associated liabilities. The primary objective of the pension plan is to provide a source of retirement income for its participants and beneficiaries, and the primary financial objective of the plan is to improve its funded status. The primary objective of the post-retirement benefit plan is growth in assets and preservation of principal, while minimizing interim volatility, to meet anticipated claims of plan participants. Wolf Creek delegates the management of its pension and post-retirement benefit plan assets to independent investment advisors who hire and dismiss investment managers based upon various factors. The investment advisors are instructed to diversify investments across asset classes, sectors and manager styles to minimize the risk of large losses, based upon objectives and risk tolerance specified by Wolf Creek, which include allowable and/or prohibited investment types. It measures and monitors investment risk on an ongoing basis through quarterly investment portfolio reviews and annual liability measurements. The target allocations for Wolf Creek's pension plan assets are 31% to international equity securities, 25% to domestic equity securities, 25% to debt securities, 10% to real estate securities, 5% to commodity investments and 4% to other investments. The investments in both international and domestic equity include investments in large-, mid- and small-cap companies, private equity funds and investment funds with underlying investments similar to those previously mentioned. The investments in debt include core and high-yield bonds. Core bonds include funds invested in investment grade debt securities of corporate entities, obligations of U.S. and foreign governments and their agencies and private debt securities. High-yield bonds include a fund with underlying investments in non-investment grade debt securities of corporate entities, private placements and bank debt. Real estate securities include funds invested in commercial and residential real estate properties while commodity investments include funds invested in commodity-related instruments. All of Wolf Creek's pension plan assets are recorded at fair value using daily net asset values as reported by the trustee. However, level 3 investments in real estate funds and alternative funds are invested in underlying investments that are illiquid and require significant judgment when measuring them at fair value using market- and income-based models. Significant unobservable inputs for underlying real estate investments include estimated market discount rates, projected cash flows and estimated value into perpetuity. Alternative funds invest in a wide range of investments typically with low correlations to traditional investments. Similar to other assets measured at fair value, GAAP establishes a hierarchal framework for disclosing the transparency of the inputs utilized in measuring pension and post-retirement benefit plan assets at fair value. From time to time, the Wolf Creek pension trust may buy and sell investments resulting in changes within the hierarchy. See Note 4, "Financial Instruments and Trading Securities," for a description of the hierarchal framework. The following table provides the fair value of KGE's 47% share of Wolf Creek's pension plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
The following table provides a reconciliation of KGE's 47% share of Wolf Creek's pension plan assets measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
Cash Flows The following table shows our expected cash flows for KGE's 47% share of Wolf Creek's pension and post-retirement benefit plans for future years.
Savings Plan Wolf Creek maintains a qualified 401(k) savings plan in which most of its employees participate. Wolf Creek matches employees' contributions in cash up to specified maximum limits. Wolf Creek's contributions to the plan are deposited with a trustee and invested at the direction of plan participants into one or more of the investment alternatives provided under the plan. KGE's portion of the expense associated with Wolf Creek's matching contributions was $1.4 million in 2014, $1.4 million in 2013 and $1.3 million in 2012. |
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Includes disclosure of the entity's share of an affiliate's pension and other post-retirement benefits. No definition available.
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Commitments And Contingencies
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||
| Commitments And Contingencies | COMMITMENTS AND CONTINGENCIES Purchase Orders and Contracts As part of our ongoing operations and capital expenditure program, we have purchase orders and contracts, excluding fuel and transmission, which are discussed below under "—Fuel, Purchased Power and Transmission Commitments." These commitments relate to purchase obligations issued and outstanding at year-end. The yearly detail of the aggregate amount of required payments as of December 31, 2014, was as follows.
Environmental Matters Air Emissions We must comply with the federal Clean Air Act, state laws and implementing federal and state regulations that impose, among other things, limitations on emissions generated from our operations, including sulfur dioxide (SO2), particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), mercury and acid gases. Emissions from our generating facilities, including PM, SO2 and NOx, have been determined by regulation to reduce visibility by causing or contributing to regional haze. Under federal laws, such as the Clean Air Visibility Rule, and pursuant to an agreement with the Kansas Department of Health and Environment (KDHE) and the Environmental Protection Agency (EPA), we are required to install, operate and maintain controls to reduce emissions found to cause or contribute to regional haze. Sulfur Dioxide and Nitrogen Oxide Through the combustion of fossil fuels at our generating facilities, we emit SO2 and NOx. Federal and state laws and regulations, including those noted above, and permits issued to us limit the amount of these substances we can emit. If we exceed these limits, we could be subject to fines and penalties. In order to meet SO2 and NOx regulations applicable to our generating facilities, we use low-sulfur coal and natural gas and have equipped the majority of our fossil fuel generating facilities with equipment to control such emissions. We are subject to the SO2 allowance and trading program under the federal Clean Air Act Acid Rain Program. Under this program, each unit must have enough allowances to cover its SO2 emissions for that year. In 2014, we had adequate SO2 allowances to meet planned generation and we expect to have enough to cover emissions under this program in 2015. Cross-State Air Pollution Rule In 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) requiring 28 states, including Kansas, Missouri and Oklahoma, to further reduce emissions of SO2, NOx and fine PM. In April 2014, the U.S. Supreme Court reversed a 2012 decision by the U.S. Court of Appeals for the District of Columbia Circuit that had vacated CSAPR and remanded CSAPR back to the U.S. Court of Appeals for further proceedings consistent with the U.S. Supreme Court decision. In June 2014, the U.S. Department of Justice, on behalf of the EPA, filed a motion to lift the CSAPR stay. In October 2014, the U.S. Court of Appeals granted the motion to lift the CSAPR stay and established a schedule to hear arguments on the remaining outstanding issues beginning in March 2015. During the CSAPR stay, we installed various emission controls at our generation facilities and have projects for additional controls in progress or planned that will reduce the impact of CSAPR. We are unable to determine the full impact of reinstatement of CSAPR until the U.S. Court of Appeals and the EPA take further action, however, we are prepared to comply with CSAPR in its current form. National Ambient Air Quality Standards Under the federal Clean Air Act, the EPA sets National Ambient Air Quality Standards (NAAQS) for certain emissions considered harmful to public health and the environment, including two classes of PM, NOx (a precursor to ozone), CO and SO2, which result from fossil fuel combustion. Areas meeting the NAAQS are designated attainment areas while those that do not meet the NAAQS are considered nonattainment areas. Each state must develop a plan to bring nonattainment areas into compliance with the NAAQS. NAAQS must be reviewed by the EPA at five-year intervals. KDHE, our state environmental regulatory agency, proposed to designate portions of the Kansas City area nonattainment for the eight-hour ozone standard. The EPA has not acted on KDHE's proposed designation of the Kansas City area and it is uncertain when, or if, such a designation might occur. The Wichita area also exceeded the eight-hour ozone standard and could be designated nonattainment in the future potentially impacting our operations. Nonattainment designations on areas that impact our operations could have a material impact on our consolidated financial results. In 2010, the EPA strengthened the NAAQS for both NOx and SO2. We continue to communicate with our regulators regarding these standards and are currently evaluating what impact this could have on our operations and consolidated financial results. If we are required to install additional equipment to control emissions at our facilities, the revised NAAQS could have a material impact on our operations and consolidated financial results. In December 2014, the EPA published a proposed rule revising NAAQS for ozone and to make certain other changes, including extending the ozone monitoring season by at least one month. The EPA intends to issue a final rule regarding the ozone NAAQS by October 2015 and make attainment/nonattainment designations for any revised standards by October 2017. We are currently reviewing this proposed new standard and cannot at this time predict the impact it may have on our operations, but it could be material. In December 2012, the EPA strengthened an existing NAAQS for one class of PM. In December 2014, the EPA designated the entire state of Kansas as unclassifiable/in attainment with the standard. We cannot at this time predict the impact this designation may have on our operations or consolidated financial results, but it could be material. Mercury and Air Toxics Standards The operation of power plants results in emissions of mercury, acid gases and other air toxics. In 2012, the EPA's Mercury and Air Toxics Standards (MATS) for power plants became effective, replacing the prior federal Clean Air Mercury Rule and requiring significant reductions in mercury, acid gases and other emissions. Several lawsuits challenging MATS have been filed by other parties and consolidated into a single proceeding before the U.S. Court of Appeals for the District of Columbia Circuit. In April 2014, the U.S. Court of Appeals issued an opinion upholding MATS. In July 2014, numerous states and two trade groups petitioned the U.S. Supreme Court to review this opinion, and in November 2014, the U.S. Supreme Court agreed to such review. The U.S. Supreme Court is expected to rule by June 2015; however, we currently cannot predict the outcome of this litigation, or its impact, if any, on our MATS compliance planning. Nonetheless, we expect to be compliant with the MATS in its current form by April 2016 as currently approved by KDHE. We currently believe that our related investment, based on MATS in its current form, will not be significant. Greenhouse Gases Byproducts of burning coal and other fossil fuels include carbon dioxide (CO2) and other gases referred to as greenhouse gases (GHGs), which are believed by many to contribute to climate change. The EPA is currently, and has further proposed, using the federal Clean Air Act to limit CO2 and other GHG emissions, and other measures are being imposed or offered by individual states, municipalities and regional agreements with the goal of reducing GHG emissions. In January 2014, the EPA re-proposed a New Source Performance Standard that would limit CO2 emissions for new coal and natural gas fueled electric generating units. The re-proposal would limit CO2 emissions to 1,000 lbs per Megawatt hour (MWh) generated for larger natural gas units and 1,100 lbs per MWh generated for smaller natural gas units and coal units. The EPA issued proposed standards addressing CO2 emissions for modified, reconstructed and existing power plants in June 2014. The standards for existing plants is known as the Clean Power Plan. The EPA anticipates issuing final rules for new, modified, reconstructed and existing power plants by summer 2015 and requiring states to submit their implementation state plans to the EPA by no later than summer 2016. The EPA is expected to propose in summer 2015 a federal plan that will implement the Clean Power Plan to be used for states that fail to submit adequate state plans, with such federal plan expected to be finalized by summer 2016. While the Clean Power Plan is not yet final, various legal and judicial challenges to it have been filed. We cannot at this time determine the impact of such proposals on our operations or consolidated financial results, but we believe the costs to comply could be material. Under regulations formerly known as the Tailoring Rule, the EPA regulates GHG emissions from certain stationary sources. The regulations are implemented pursuant to two federal Clean Air Act programs, the Prevention of Significant Deterioration (PSD) and Title V Operating Permit Programs, that impose recordkeeping and monitoring requirements and also mandate the implementation of best available control technology (BACT) for projects that cause a significant increase in GHG emissions (currently defined to be more than 75,000 tons or more per year or 100,000 tons or more per year, depending on various factors). In June 2014, the U.S. Supreme Court ruled that the EPA had exceeded its statutory authority in issuing the Tailoring Rule by regulating under the PSD program sources based solely on their GHG emissions. However, the U.S. Supreme Court also held that the EPA could impose GHG BACT requirements for sources already required to implement PSD for other pollutants. Therefore, if future modifications to our sources require PSD review for other pollutants, it may also trigger GHG BACT requirements. The EPA has issued guidance on what BACT entails for the control of GHGs and individual states are now required to determine what controls are required for facilities within their jurisdiction on a case-by-case basis. We cannot at this time determine the impact of these regulations on our future operations or consolidated financial results as the rule has not been finalized, but we believe the cost of compliance with the regulations could be material. Water We discharge some of the water used in our operations. This water may contain substances deemed to be pollutants. Revised rules governing such discharges from coal-fired power plants are expected to be issued by the EPA by the end of September 2015. Although we cannot at this time determine the timing or impact of compliance with any new regulations, more stringent regulations could have a material impact on our operations or consolidated financial results. In October 2014, the EPA’s final standards for cooling intake structures at power plants to protect aquatic life took effect. The standards, based on Section 316(b) of the federal Clean Water Act (CWA), require subject facilities to choose among seven Best Technology Available options to reduce fish impingement. In addition, some facilities must conduct studies to assist permitting authorities to determine whether and what site-specific controls, if any, would be required to reduce entrainment of aquatic organisms. Our current analysis indicates this rule will not have a significant impact on our coal plants that employ cooling towers. Biological monitoring may be required for LaCygne and Wolf Creek. We are currently evaluating the rule's impact on those two plants and cannot predict the resulting impact on our operations or consolidated financial results, but we do not expect it to be material. In April 2014, the EPA along with the U.S. Army Corps of Engineers issued a proposed rule defining the Waters of the United States for purposes of the CWA. This rulemaking has the potential to impact all programs under the CWA. Expansion of regulated waterways is possible under the proposal, which could impact several permitting programs. Although we cannot at this time determine the timing or impact of compliance with any new regulations, more stringent regulations could have a material impact on our operations or consolidated financial results. Regulation of Coal Combustion Byproducts In the course of operating our coal generation plants, we produce coal combustion byproducts (CCBs), including fly ash, gypsum and bottom ash. We recycle some of our ash production, principally by selling to the aggregate industry. In 2010, the EPA proposed a rule to regulate CCB by the federal government. The EPA released a pre-publication version of the rule in December 2014, which we believe will require additional CCB handling, processing and storage equipment and potential closure of certain ash disposal areas, but it has not yet published the final rule. While we cannot at this time estimate the impact and costs associated with future regulations of CCB, we believe the impact on our operations or consolidated financial results could be material. Environmental Projects We will continue to make significant capital and operating expenditures at our power plants to reduce regulated emissions. The amount of these expenditures could change materially depending on the timing and nature of required investments, the specific outcomes resulting from existing regulations, new regulations, legislation and the manner in which we operate the plants. In addition to the capital investment, in the event we install new equipment, such equipment may cause us to incur significant increases in annual operating and maintenance expense and may reduce the net production, reliability and availability of the plants. The degree to which we will need to reduce emissions and the timing of when such emissions controls may be required is uncertain. Additionally, our ability to access capital markets and the availability of materials, equipment and contractors may affect the timing and ultimate amount of such capital investments. We are currently permitted to recover certain of these costs through the ECRR, which, in comparison to a general rate review, reduces the amount of time it takes to begin collecting in retail prices the costs associated with capital expenditures for qualifying environmental improvements. We are not allowed to use the ECRR to collect approximately $610.0 million of the projected capital investment associated with the environmental upgrades at La Cygne. In November 2013, the KCC issued an order allowing us to adjust our prices to include the additional investment in the La Cygne environmental upgrades and to reflect cost reductions elsewhere. The new prices are expected to increase our annual retail revenues by approximately $30.7 million. To change our prices to collect increased operating and maintenance costs, we must file a general rate review with the KCC. We intend to file our next general rate review in March 2015. In addition, the installation of new equipment may cause us to reduce the net production, reliability and availability of our plants. Furthermore, enhancements to our power plants, even if they result in greater efficiency, can trigger a regulatory review, which could result in increased costs or other operational requirements. For additional information regarding our abbreviated rate review, see Note 3, "Rate Matters and Regulation." EPA Consent Decree As part of a 2010 settlement of a lawsuit filed by the U.S. Department of Justice on behalf of the EPA, we completed installation of selective catalytic reduction equipment on one of our three JEC coal units in December 2014, at a cost of approximately $225.0 million. We also completed installation of less expensive NOx reduction equipment on the other two units to satisfy other terms of the settlement. We plan to recover the costs of installing these systems through our ECRR, but such recovery remains subject to the approval of our regulators. Renewable Energy Standard Kansas law mandates that we maintain a minimum amount of renewable energy sources. Through 2015, net renewable generation capacity must be 10% of the average peak retail demand for the three prior years, subject to limited exceptions. This requirement increases to 15% for years 2016 through 2019 and 20% for 2020 and thereafter. With our existing wind generation facilities, supply contracts and renewable energy credits, we are able to satisfy the net renewable generation requirement through 2015. With our agreements to purchase an additional 400 MW of installed design capacity from wind generation facilities beginning in 2015 through 2016, we expect to meet the increased requirements for 2020 and thereafter. If we are unable to meet future requirements, our operations and consolidated financial results could be adversely impacted. Nuclear Decommissioning Nuclear decommissioning is a nuclear industry term for the permanent shutdown of a nuclear power plant and the removal of radioactive components in accordance with Nuclear Regulatory Commission (NRC) requirements. The NRC will terminate a plant's license and release the property for unrestricted use when a company has reduced the residual radioactivity of a nuclear plant to a level mandated by the NRC. The NRC requires companies with nuclear plants to prepare formal financial plans to fund nuclear decommissioning. These plans are designed so that sufficient funds required for nuclear decommissioning will be accumulated prior to the expiration of the license of the related nuclear power plant. Wolf Creek files a nuclear decommissioning site study with the KCC every three years. The KCC reviews nuclear decommissioning plans in two phases. Phase one is the approval of the updated nuclear decommissioning study including the estimated costs to decommission the plant. Phase two involves the review and approval of a funding schedule prepared by the owner of the plant detailing how it plans to fund the future-year dollar amount of its pro rata share of the decommissioning costs. In 2014, Wolf Creek updated the nuclear decommissioning cost study. Based on the study, our share of decommissioning costs, including decontamination, dismantling and site restoration, is estimated to be approximately $360.0 million. This amount compares to the prior site study estimate of $296.2 million. The site study cost estimate represents the estimate to decommission Wolf Creek as of the site study year. The actual nuclear decommissioning costs may vary from the estimates because of changes in regulations and technologies as well as changes in costs for labor, materials and equipment. We are allowed to recover nuclear decommissioning costs in our prices over a period equal to the operating license of Wolf Creek, which is through 2045. The NRC requires that funds sufficient to meet nuclear decommissioning obligations be held in a trust. We believe that the KCC approved funding level will also be sufficient to meet the NRC requirement. Our consolidated financial results would be materially affected if we were not allowed to recover in our prices the full amount of the funding requirement. We recovered in our prices and deposited in an external trust fund for nuclear decommissioning approximately $2.8 million in 2014, $2.9 million in 2013 and $3.2 million in 2012. We record our investment in the NDT fund at fair value, which approximated $185.0 million and $175.6 million as of December 31, 2014 and 2013, respectively. Storage of Spent Nuclear Fuel Under the Nuclear Waste Policy Act of 1982, the Department of Energy (DOE) is responsible for the permanent disposal of spent nuclear fuel. Wolf Creek paid into a federal Nuclear Waste Fund administered by the DOE a quarterly fee for the future disposal of spent nuclear fuel. In November 2013, a federal court of appeals ruled that the DOE must stop collecting this fee effective May 2014. Our share of the fee, calculated as one tenth of a cent for each kilowatt-hour of net nuclear generation delivered to customers, was $0.8 million in 2014, $3.0 million in 2013 and $3.6 million in 2012. We include these costs in fuel and purchased power expense on our consolidated statements of income. In 2010, the DOE filed a motion with the NRC to withdraw its then pending application to construct a national repository for the disposal of spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. An NRC board denied the DOE's motion to withdraw its application and the DOE appealed that decision to the full NRC. In 2011, the NRC issued an evenly split decision on the appeal and also ordered the licensing board to close out its work on the DOE's application by the end of 2011 due to a lack of funding. These agency actions prompted the States of Washington and South Carolina, and a county in South Carolina, to file a lawsuit in a federal Court of Appeals asking the court to compel the NRC to resume its license review and to issue a decision on the license application. In August 2013, the court ordered the NRC to resume its review of the DOE's application. Wolf Creek has an on-site storage facility designed to hold all spent fuel generated at the plant through 2025 and believes it will be able to expand on-site storage as needed past 2025. We cannot predict when, or if, an alternative disposal site will be available to receive Wolf Creek's spent nuclear fuel and will continue to monitor this activity. Wolf Creek disposes of most of its low-level radioactive waste at an existing third-party repository in Utah, which we expect will remain available to Wolf Creek. Wolf Creek also contracts with a waste processor to process, take title and dispose in another state most of the remainder of Wolf Creek's low-level radioactive waste. Should on-site waste storage be needed in the future, Wolf Creek has storage capacity on site adequate for approximately four years of plant operations and believes it would be able to expand that storage capacity if needed. Nuclear Insurance We maintain nuclear liability, property and business interruption insurance for Wolf Creek. These policies contain certain industry standard terms, conditions and exclusions, including, but not limited to, ordinary wear and tear and war. An industry aggregate limit of $3.2 billion plus any reinsurance, indemnity or any other source recoverable by Nuclear Electric Insurance Limited (NEIL), our property and business interruption insurance provider, exists for acts of terrorism affecting Wolf Creek or any other NEIL insured plant within 12 months from the date of the first act. In addition, we may be required to participate in industry-wide retrospective assessment programs as discussed below. Nuclear Liability Insurance Pursuant to the Price-Anderson Act, which has been reauthorized through December 2025 by the Energy Policy Act of 2005, we are required to insure against public liability claims resulting from nuclear incidents to the current limit of public liability, which is approximately $13.6 billion. This limit of liability consists of the maximum available commercial insurance of $375.0 million and the remaining $13.2 billion is provided through mandatory participation in an industry-wide retrospective assessment program. In addition, Congress could impose additional revenue-raising measures to pay claims. Under this retrospective assessment program, the owners of Wolf Creek are jointly and severally subject to an assessment of up to $127.3 million (our share is $59.8 million), payable at no more than $19.0 million (our share is $8.9 million) per incident per year per reactor. Both the total and yearly assessment is subject to an inflationary adjustment every five years with the next adjustment in 2018. Nuclear Property and Business Interruption Insurance The owners of Wolf Creek carry decontamination liability, premature nuclear decommissioning liability and property damage insurance for Wolf Creek totaling approximately $2.8 billion. In the event of an accident, insurance proceeds must first be used for reactor stabilization and site decontamination in accordance with a plan mandated by the NRC. Our share of any remaining proceeds can be used to pay for property damage or, if certain requirements are met, including decommissioning the plant, toward a shortfall in the NDT fund. The owners also carry additional insurance with NEIL to cover costs of replacement power and other extra expenses incurred during a prolonged outage resulting from accidental property damage at Wolf Creek. If significant losses were incurred at any of the nuclear plants insured under the NEIL policies, we may be subject to retrospective assessments under the current policies of approximately $39.5 million (our share is $18.6 million). Accidental Nuclear Outage Insurance Although we maintain various insurance policies to provide coverage for potential losses and liabilities resulting from an accident or an extended outage, our insurance coverage may not be adequate to cover the costs that could result from a catastrophic accident or extended outage at Wolf Creek. Any substantial losses not covered by insurance, to the extent not recoverable in our prices, would have a material effect on our consolidated financial results. Fuel, Purchased Power and Transmission Commitments To supply a portion of the fuel requirements for our power plants, the owners of Wolf Creek have entered into various contracts to obtain nuclear fuel and we have entered into various contracts to obtain coal and natural gas. Some of these contracts contain provisions for price escalation and minimum purchase commitments. As of December 31, 2014, our share of Wolf Creek's nuclear fuel commitments was approximately $27.1 million for uranium concentrates expiring in 2017, $4.1 million for conversion expiring in 2017, $93.3 million for enrichment expiring in 2025 and $33.3 million for fabrication expiring in 2023. As of December 31, 2014, our coal and coal transportation contract commitments under the remaining terms of the contracts were approximately $1.1 billion. The contracts are for plants that we operate and expire at various times through 2020. As of December 31, 2014, our natural gas transportation contract commitments under the remaining terms of the contracts were approximately $118.5 million. The natural gas transportation contracts provide firm service to several of our natural gas burning facilities and expire at various times through 2030. We have power purchase agreements with the owners of six separate wind generation facilities with installed design capacities of 915 MW expiring in 2028 through 2036. Of the 915 MW under contract, 400 MW are associated with agreements pursuant to which generation providers are scheduled to deliver power beginning in 2015 and 2016. Each of the agreements provide for our receipt and purchase of energy produced at a fixed price per unit of output. We estimate that our annual cost of energy purchased from these wind generation facilities will be approximately $68.2 million in 2015 and approximately $110.0 million for the next several years thereafter. We have acquired rights to transmit a total of 306 MW. Agreements providing transmission capacity for approximately 200 MW expire in 2016 while the remaining 106 MW expire in 2022. As of December 31, 2014, we are committed to spend approximately $34.0 million over the remaining terms of these agreements. |
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Asset Retirement Obligations
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Dec. 31, 2014
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| Asset Retirement Obligation [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Asset Retirement Obligations | ASSET RETIREMENT OBLIGATIONS Legal Liability We have recognized legal obligations associated with the disposal of long-lived assets that result from the acquisition, construction, development or normal operation of such assets. The recording of AROs for regulated operations has no income statement impact due to the deferral of the adjustments through the establishment of a regulatory asset or an offset to a regulatory liability. We initially recorded AROs at fair value for the estimated cost to decommission Wolf Creek (KGE's 47% share), dispose of asbestos insulating material at our power plants, remediate ash disposal ponds and dispose of polychlorinated biphenyl (PCB)-contaminated oil. The following table summarizes our legal AROs included on our consolidated balance sheets in long-term liabilities.
Wolf Creek filed a nuclear decommissioning cost study with the KCC in 2014. As a result of the study, we recorded a $50.7 million increase in our ARO to reflect revisions to the estimated costs to decommission Wolf Creek. Conditional ARO refers to a legal obligation to perform an asset retirement activity in which the timing and/or method of settlement are conditional on a future event that may or may not be within the control of the entity. We determined that our conditional AROs include the retirement of our wind generation facilities, disposal of asbestos insulating material at our power plants, the remediation of ash disposal ponds and the disposal of PCB-contaminated oil. We have an obligation to retire our wind generation facilities and remove the foundations. The ARO related to our wind generation facilities was determined based upon the date each wind generation facility was placed into service. The amount of the retirement obligation related to asbestos disposal was recorded as of 1990, the date when the EPA published the "National Emission Standards for Hazardous Air Pollutants: Asbestos NESHAP Revision; Final Rule." We operate, as permitted by the state of Kansas, ash landfills at several of our power plants. The retirement obligation for the ash landfills was determined based upon the date each landfill was originally placed in service. PCB-contaminated oil is contained within company electrical equipment, primarily transformers. The PCB retirement obligation was determined based upon the PCB regulations that originally became effective in 1978. Non-Legal Liability - Cost of Removal We collect in our prices the costs to dispose of plant assets that do not represent legal retirement obligations. As of December 31, 2014 and 2013, we had $88.2 million and $114.1 million, respectively, in amounts collected, but not yet spent, for removal costs classified as a regulatory liability. |
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The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Legal Proceedings
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Dec. 31, 2014
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| Legal Proceedings [Abstract] | |
| Legal Proceedings | LEGAL PROCEEDINGS We and our subsidiaries are involved in various legal, environmental and regulatory proceedings. We believe that adequate provisions have been made and accordingly believe that the ultimate disposition of such matters will not have a material effect on our consolidated financial results. See Note 3, "Rate Matters and Regulation," and Note 13, "Commitments and Contingencies," for additional information. |
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Open legal proceedings in the normal course of business, including product liability and other litigation and contingencies. No definition available.
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Common and Preferred Stock
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Dec. 31, 2014
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| Common and Preferred Stock | COMMON AND PREFERRED STOCK Common Stock General In 2011, Westar Energy shareholders approved an amendment to its Restated Articles of Incorporation to increase the number of shares of common stock authorized to be issued from 150.0 million to 275.0 million. As of December 31, 2014 and 2013, Westar Energy had issued 131.7 million shares and 128.3 million shares, respectively. Westar Energy has a direct stock purchase plan (DSPP). Shares of common stock sold pursuant to the DSPP may be either original issue shares or shares purchased in the open market. During 2014 and 2013, Westar Energy issued 0.5 million shares and 0.7 million shares, respectively, through the DSPP and other stock-based plans operated under the LTISA Plan. As of December 31, 2014 and 2013, a total of 1.6 million shares and 2.0 million shares, respectively, were available under the DSPP registration statement. Issuances In September 2013, Westar Energy entered into two forward sale agreements with two banks. Under the terms of the agreements, the banks, as forward sellers, borrowed 8.0 million shares of Westar Energy's common stock from third parties and sold them to a group of underwriters for $31.15 per share. Pursuant to over-allotment options granted to the underwriters, the underwriters purchased in October 2013 an additional 0.9 million shares from the banks as forward sellers, increasing the total number of shares under the forward sale agreements to approximately 8.9 million. The underwriters received a commission equal to 3.5% of the sales price of all shares sold under each agreement. Westar Energy must settle such transactions within 24 months of the applicable agreement. In March 2013, Westar Energy entered into a three-year sales agency financing agreement and master forward sale agreement with a bank. The maximum amount that Westar Energy may offer and sell under the March 2013 master agreements is the lesser of an aggregate of $500.0 million or approximately 25.0 million shares, subject to adjustment for share splits, share combinations and share dividends. Under the terms of the sales agency financing agreement, Westar Energy may offer and sell shares of its common stock from time to time. In addition, under the terms of the sales agency financing agreement and master forward sale confirmation, Westar Energy may from time to time enter into one or more forward sale transactions with the bank, as forward purchaser and the bank will borrow shares of Westar Energy's common stock from third parties and sell them through its agent. The agent receives a commission equal to 1% of the sales price of all shares sold under the agreements. Westar Energy must settle the forward sale transactions within 18 months of the date each transaction is entered. In April 2010, Westar Energy entered into a three-year sales agency financing agreement and master forward sale agreement with a bank that was terminated in March 2013. The maximum amount that Westar Energy could offer and sell under the agreements was the lesser of an aggregate of $500.0 million or approximately 22.0 million shares, subject to adjustment for share splits, share combinations and share dividends. Terms under these agreements were generally similar to the March 2013 agreements described above. The following table summarizes our common stock activity pursuant to the three forward sale agreements.
The forward sale transactions are entered into at market prices; therefore, the forward sale agreements have no initial fair value. Westar Energy does not receive any proceeds from the sale of common stock under the forward sale agreements until transactions are settled. Upon settlement, Westar Energy will record the forward sale agreements within equity. Except in specified circumstances or events that would require physical share settlement, Westar Energy is able to elect to settle any forward sale transactions by means of physical share, cash or net share settlement, and is also able to elect to settle the forward sale transactions in whole, or in part, earlier than the stated maturity dates. Currently, Westar Energy anticipates settling the forward sale transactions through physical share settlement. The shares under the forward sale agreements are initially priced when the transactions are entered into and are subject to certain fixed pricing adjustments during the term of the agreements. Accordingly, assuming physical share settlement, Westar Energy's net proceeds from the forward sale transactions will represent the prices established by the forward sale agreements applicable to the time periods in which physical settlement occurs. Westar Energy used the proceeds from the transactions described above to repay short-term borrowings, with such borrowed amounts principally used for investments in capital equipment, as well as for working capital and general corporate purposes. Preferred Stock Redemption In May 2012, Westar Energy provided an irrevocable notice of redemption to holders of all of Westar Energy's preferred shares. Accordingly, we reduced preferred equity to zero, recognized the obligation to redeem the preferred shares as a liability and recognized the redemption premium as a preferred stock dividend. Payment was due to holders of the preferred shares effective July 1, 2012. The table below shows the redemption amounts for all series of preferred stock.
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Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Variable Interest Entities
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Dec. 31, 2014
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| Variable Interest Entities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Variable Interest Entities Disclosure [Text Block] | VARIABLE INTEREST ENTITIES In determining the primary beneficiary of a VIE, we assess the entity's purpose and design, including the nature of the entity's activities and the risks that the entity was designed to create and pass through to its variable interest holders. A reporting enterprise is deemed to be the primary beneficiary of a VIE if it has (a) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE. Accounting guidance effective in 2010 requires the primary beneficiary of a VIE to consolidate the VIE. The trusts holding our 8% interest in JEC and our 50% interest in La Cygne unit 2 are VIEs of which we are the primary beneficiary. We assess all entities with which we become involved to determine whether such entities are VIEs and, if so, whether or not we are the primary beneficiary of the entities. We also continuously assess whether we are the primary beneficiary of the VIEs with which we are involved. Prospective changes in facts and circumstances may cause us to reconsider our determination as it relates to the identification of the primary beneficiary. 8% Interest in Jeffrey Energy Center Under an agreement that expires in January 2019, we lease an 8% interest in JEC from a trust. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 8% interest in JEC and lease it to a third party, and does not hold any other assets. We meet the requirements to be considered the primary beneficiary of the trust. In determining the primary beneficiary of the trust, we concluded that the activities of the trust that most significantly impact its economic performance and that we have the power to direct include (1) the operation and maintenance of the 8% interest in JEC, (2) our ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount and (3) our option to require refinancing of the trust's debt. We have the potential to receive benefits from the trust that could potentially be significant if the fair value of the 8% interest in JEC at the end of the agreement is greater than the fixed amount. The possibility of lower interest rates upon refinancing the debt also creates the potential for us to receive significant benefits. 50% Interest in La Cygne Unit 2 Under an agreement that expires in September 2029, KGE entered into a sale-leaseback transaction with a trust under which the trust purchased KGE's 50% interest in La Cygne unit 2 and subsequently leased it back to KGE. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 50% interest in La Cygne unit 2 and lease it back to KGE, and does not hold any other assets. We meet the requirements to be considered the primary beneficiary of the trust. In determining the primary beneficiary of the trust, we concluded that the activities of the trust that most significantly impact its economic performance and that we have the power to direct include (1) the operation and maintenance of the 50% interest in La Cygne unit 2, (2) our ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount and (3) our option to require refinancing of the trust's debt. We have the potential to receive benefits from the trust that could potentially be significant if the fair value of the 50% interest in La Cygne unit 2 at the end of the agreement is greater than the fixed amount. The possibility of lower interest rates upon refinancing the debt also creates the potential for us to receive significant benefits. Railcars Under two separate agreements, we leased railcars from unrelated trusts to transport coal to some of our power plants. We consolidated the trusts as a VIEs until the agreements expired in May 2013 and November 2014. As a result of deconsolidating the trusts, property, plant and equipment of VIEs, net and noncontrolling interests decreased $14.3 million in 2013 and $7.3 million in 2014. Financial Statement Impact We have recorded the following assets and liabilities on our consolidated balance sheets related to the VIEs described above.
_______________ (a) Included in long-term regulatory assets on our consolidated balance sheets. (b) Included in accrued interest on our consolidated balance sheets. All of the liabilities noted in the table above relate to the purchase of the property, plant and equipment. The assets of the VIEs can be used only to settle obligations of the VIEs and the VIEs' debt holders have no recourse to our general credit. We have not provided financial or other support to the VIEs and are not required to provide such support. We did not record any gain or loss upon initial consolidation of the VIEs. |
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Leases
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Dec. 31, 2014
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| Leases | LEASES Operating Leases We lease office buildings, computer equipment, vehicles, railcars and other property and equipment. These leases have various terms and expiration dates ranging from one to 20 years. In determining lease expense, we recognize the effects of scheduled rent increases on a straight-line basis over the minimum lease term. Rental expense and estimated future commitments under operating leases are as follows.
Capital Leases We identify capital leases based on defined criteria. For both vehicles and computer equipment, new leases are signed each month based on the terms of master lease agreements. The lease term for vehicles is from two to eight years depending on the type of vehicle. Computer equipment has a lease term of three to five years. Assets recorded under capital leases are listed below.
Capital leases are treated as operating leases for rate making purposes. Minimum annual rental payments, excluding administrative costs such as property taxes, insurance and maintenance, under capital leases are listed below.
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The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Dec. 31, 2014
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly Results (Unaudited) | QUARTERLY RESULTS (UNAUDITED) Our business is seasonal in nature and, in our opinion, comparisons between the quarters of a year do not give a true indication of overall trends and changes in operations.
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The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Valuation and Qualifying Accounts
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Valuation and Qualifying Accounts [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valuation and Qualifying Accounts | WESTAR ENERGY, INC. SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
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The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary Of Significant Accounting Policies (Policy)
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Dec. 31, 2014
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Principles Of Consolidation | Principles of Consolidation We prepare our consolidated financial statements in accordance with generally accepted accounting principles (GAAP) for the United States of America. Our consolidated financial statements include all operating divisions, majority owned subsidiaries and variable interest entities (VIEs) of which we maintain a controlling interest or are the primary beneficiary reported as a single reportable segment. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany accounts and transactions have been eliminated in consolidation. |
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| Use Of Management's Estimates | Use of Management's Estimates When we prepare our consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities, at the date of our consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. We evaluate our estimates on an ongoing basis, including those related to depreciation, unbilled revenue, valuation of investments, forecasted fuel costs included in our retail energy cost adjustment (RECA) billed to customers, income taxes, pension and post-retirement benefits, our asset retirement obligations (AROs) including the decommissioning of Wolf Creek Generating Station (Wolf Creek), environmental issues, VIEs, contingencies and litigation. Actual results may differ from those estimates under different assumptions or conditions. |
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| Regulatory Accounting | Regulatory Accounting We apply accounting standards that recognize the economic effects of rate regulation. Accordingly, we have recorded regulatory assets and liabilities when required by a regulatory order or based on regulatory precedent. See Note 3, "Rate Matters and Regulation," for additional information regarding our regulatory assets and liabilities. |
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| Cash And Cash Equivalents | Cash and Cash Equivalents We consider investments that are highly liquid and have maturities of three months or less when purchased to be cash equivalents. |
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| Fuel Inventory And Supplies | Fuel Inventory and Supplies We state fuel inventory and supplies at average cost. |
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| Property, Plant And Equipment | Property, Plant and Equipment We record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. We compute AFUDC by applying a composite rate to qualified construction work in progress. We credit other income (for equity funds) and interest expense (for borrowed funds) for the amount of AFUDC capitalized as construction cost on the accompanying consolidated statements of income as follows:
We charge maintenance costs and replacements of minor items of property to expense as incurred, except for maintenance costs incurred for our planned refueling and maintenance outages at Wolf Creek. As authorized by regulators, we defer and amortize to expense ratably over the period between planned outages incremental maintenance costs incurred for such outages. When a unit of depreciable property is retired, we charge to accumulated depreciation the original cost less salvage value. |
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| Allowance For Funds Used During Construction | AFUDC represents the allowed cost of capital used to finance utility construction activity. We compute AFUDC by applying a composite rate to qualified construction work in progress. We credit other income (for equity funds) and interest expense (for borrowed funds) for the amount of AFUDC capitalized as construction cost on the accompanying consolidated statements of income |
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| Depreciation | Depreciation We depreciate utility plant using a straight-line method. The depreciation rates are based on an average annual composite basis using group rates that approximated 2.4% in 2014, 2.5% in 2013 and 2.6% in 2012. Depreciable lives of property, plant and equipment are as follows.
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| Nuclear Fuel | Nuclear Fuel We record as property, plant and equipment our share of the cost of nuclear fuel used in the process of refinement, conversion, enrichment and fabrication. We reflect this at original cost and amortize such amounts to fuel expense based on the quantity of heat consumed during the generation of electricity as measured in millions of British thermal units (MMBtu). |
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| Cash Surrender Value of Life Insurance | Cash Surrender Value of Life Insurance We recorded on our consolidated balance sheets in other long-term assets the following amounts related to corporate-owned life insurance (COLI) policies.
We record as income increases in cash surrender value and death benefits. We offset against policy income the interest expense that we incur on policy loans. Income from death benefits is highly variable from period to period. |
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| Revenue Recognition | Revenue Recognition We record revenue at the time we deliver electricity to customers. We determine the amounts delivered to individual customers through systematic monthly readings of customer meters. At the end of each month, we estimate how much electricity we have delivered since the prior meter reading and record the corresponding unbilled revenue. Our unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. We recorded estimated unbilled revenue of $61.0 million as of December 31, 2014, and $60.1 million as of December 31, 2013. |
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| Allowance For Doubtful Accounts | Allowance for Doubtful Accounts We determine our allowance for doubtful accounts based on the age of our receivables. We charge receivables off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment. |
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| Income Taxes | Income Taxes We use the asset and liability method of accounting for income taxes. Under this method, we recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. We recognize the future tax benefits to the extent that realization of such benefits is more likely than not. We amortize deferred investment tax credits over the lives of the related properties as required by tax laws and regulatory practices. We recognize production tax credits in the year that electricity is generated to the extent that realization of such benefits is more likely than not. We record deferred tax assets to the extent capital losses, operating losses, or tax credits will be carried forward to future periods. However, when we believe based on available evidence that we do not, or will not, have sufficient future capital gains or taxable income in the appropriate taxing jurisdiction to realize the entire benefit during the applicable carryforward period, we record a valuation allowance against the deferred tax asset. The application of income tax law is complex. Laws and regulations in this area are voluminous and often ambiguous. Accordingly, we must make judgments regarding income tax exposure. Interpretations of and guidance surrounding income tax laws and regulations change over time. As a result, changes in our judgments can materially affect amounts we recognize in our consolidated financial statements. See Note 10, "Taxes," for additional detail on our accounting for income taxes. |
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| Sales Tax | Sales Tax We account for the collection and remittance of sales tax on a net basis. As a result, we do not reflect sales tax in our consolidated statements of income. |
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| Earnings Per Share | Earnings Per Share We have participating securities in the form of unvested restricted share units (RSUs) with nonforfeitable rights to dividend equivalents that receive dividends on an equal basis with dividends declared on common shares. As a result, we apply the two-class method of computing basic and diluted earnings per share (EPS). To compute basic EPS, we divide the earnings allocated to common stock by the weighted average number of common shares outstanding. Diluted EPS includes the effect of potential issuances of common shares resulting from our forward sale agreements and RSUs with forfeitable rights to dividend equivalents. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. The following table reconciles our basic and diluted EPS from net income.
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| Supplemental Cash Flow Information |
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Disclosure of accounting policy for AFUDC (for example, component of PPE, credit to income statement), information regarding the inclusion in rates (only capitalized if its inclusion in rates is probable) and description of AFUDC (for example, represents the cost of capital used during construction). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for fuel costs amortized and recorded and recovered through rates, such as under a fuel adjustment clause or other tracking arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for systematically allocating capitalized costs to periods that benefit from the use thereof. Includes, but is not limited to, methods used, such as composite depreciation, descriptions of regulatory treatment for estimated removal and disposal costs, and description of amortization of plant-related regulatory assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for trade and other accounts receivables. This disclosure may include the basis at which such receivables are carried in the entity's statements of financial position (for example, net realizable value), how the entity determines the level of its allowance for doubtful accounts, when impairments, charge-offs or recoveries are recognized, and the entity's income recognition policies for such receivables, including its treatment of related fees and costs, its treatment of premiums, discounts or unearned income, when accrual of interest is discontinued, how the entity records payments received on nonaccrual receivables and its policy for resuming accrual of interest on such receivables. If the enterprise holds a large number of similar loans, disclosure may include the accounting policy for the anticipation of prepayments and significant assumptions underlying prepayment estimates for amortization of premiums, discounts, and nonrefundable fees and costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Disclosure of policy for accounting for corporate owned life insurance. No definition available.
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| X | ||||||||||
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- Definition
Regulatory Accounting [Policy Text Block] No definition available.
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| X | ||||||||||
|
- Definition
Sales Tax [Policy Text Block] No definition available.
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Summary Of Significant Accounting Policies (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fuel Inventory and Supplies | Following are the balances for fuel inventory and supplies stated separately.
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| Allowance For Funds Used During Construction | We credit other income (for equity funds) and interest expense (for borrowed funds) for the amount of AFUDC capitalized as construction cost on the accompanying consolidated statements of income as follows:
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| Depreciable Lives of Property, Plant and Equipment | Depreciable lives of property, plant and equipment are as follows.
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| Cash Surrender Value of Life Insurance | We recorded on our consolidated balance sheets in other long-term assets the following amounts related to corporate-owned life insurance (COLI) policies.
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| Reconciliation Of Basic And Diluted Earnings Per Share | The following table reconciles our basic and diluted EPS from net income.
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| Supplemental Cash Flow Information |
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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| X | ||||||||||
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- Definition
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of all information related to inventories for utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of an entity's allowance for funds used during construction. No definition available.
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Rate Matters And Regulation (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Regulated Operations [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Regulatory Assets And Liabilities [Table Text Block] | Regulatory assets and liabilities reflected on our consolidated balance sheets are as follows.
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- Details
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| X | ||||||||||
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- Definition
Schedule Of Regulatory Assets And Liabilities [Table Text Block] No definition available.
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Financial Instruments and Trading Securities (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Financial And Derivative Instruments and Trading Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Carrying Values And Fair Values Of Financial Instruments | The following table provides the carrying values and measured fair values of our fixed-rate debt.
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| Fair Value Of Assets And Liabilities | The following table provides the amounts and their corresponding level of hierarchy for our assets that are measured at fair value.
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| Reconciliations Of Assets And Liabilities At Fair Value | The following table provides reconciliations of assets held in the NDT measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
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| Unrealized Gains And Losses On Financial Statements | The following table summarizes the unrealized gains and losses we recorded to regulatory liabilities on our consolidated financial statements during the years ended December 31, 2014 and 2013, attributed to level 3 assets and liabilities.
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| Investments In Financial Instruments | The following table provides additional information on these investments.
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| X | ||||||||||
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- Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
This item represents the disclosure regarding the investments in certain entities that calculate net asset value per share that enables users to understand the nature and risks of the investments and whether the investments are probable of being sold at amounts different from net asset value per share. Such disclosure may include (1) the fair value of the investments in the major category, and a description of the significant investment strategies of the investee(s) in the major category; (2) for each major category of investment that includes investments that can never be redeemed with the investees, but the reporting entity receives distributions through the liquidation of the underlying assets of the investees, the reporting entity's estimate of the period of time over which the underlying assets are expected to be liquidated by the investees; (3) the amount of the entity's unfunded commitments related to investments in the major category; (4) a general description of the terms and conditions upon which the investor may redeem investments in the major category; (5) the circumstances in which an otherwise redeemable investment in the major category might not be redeemable; (6) for those otherwise redeemable investments that are restricted from redemption as of the reporting entity's measurement date, the entity's best estimate of when the restriction from redemption might lapse; if an estimate cannot be made, the entity shall disclose that fact and how long the restriction has been in effect; (7) any other significant restriction on the ability to sell investments in the major category at the measurement date; (8) total fair value of held for sale investments and any remaining actions required to complete the sale when the reporting entity determines that it is probable that it will sell the investments for an amount different from net asset value per share; and (9) disclosure of an entity's plans to sell and any remaining actions required to complete the sale when the entity intends to sell a group of investments, but the individual investments to be sold have not been identified. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Schedule of Carrying Value and Fair Values of Financial Instruments. No definition available.
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| X | ||||||||||
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- Definition
Schedule of unrealized gains and losses recorded for assets and liabilities measured at fair value on a recurring basis using unobservable inputs. No definition available.
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Financial Investments (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cost And Fair Value Of Available-For-Sale Securities | The following table presents the cost, gross unrealized gains and losses, fair value and allocation of investments in the NDT fund as of December 31, 2014 and 2013.
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| Fair Value And Gross Unrealized Losses Of Available-For-Sale Securities | The following table presents the fair value and the gross unrealized losses of the available-for-sale securities held in the NDT fund aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2014 and 2013.
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. No definition available.
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| X | ||||||||||
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- Definition
Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Property, Plant And Equipment (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Public Utility, Property, Plant and Equipment [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Public Utility Property, Plant, and Equipment | The following is a summary of our property, plant and equipment balance.
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Variable Interest Entity [Member]
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| Public Utility, Property, Plant and Equipment [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Public Utility Property, Plant, and Equipment | The following is a summary of property, plant and equipment of VIEs.
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- Details
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- Definition
Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Joint Ownership of Utility Plants Joint Ownership of Utility Plants (Tables)
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12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Jointly Owned Utility Plant, Net Ownership Amount [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Jointly Owned Utility Plants | Information relative to our ownership interests in these facilities as of December 31, 2014, is shown in the table below.
_______________
(c) Jointly owned with Empire District Electric Company. |
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- Details
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- Definition
Tabular disclosure of proportionate interests in jointly owned utility plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of plants under construction, and the proportionate share. The amounts presented may be further subdivided to show amounts applicable to plant subcategories (for example, production, transmission, distribution). Includes statements that the amounts represent the utility's share in each joint plant and that it must provide its own financing. Information concerning two or more generating plants on the same site may be combined. States that the utility's share of direct expenses of the joint plants is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance of plant, other operating expense). If the share of direct expenses is charged to purchased power, then disclose the amount so charged and the proportionate amounts charged to specific operating expenses on the records maintained for the joint plants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Short-Term Debt (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Debt Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Short-term Debt Additional Information | Additional information regarding our short-term debt is as follows.
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- Details
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- Definition
Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Long-term Debt, Unclassified [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt Outstanding | The following table summarizes our long-term debt outstanding.
_______________ (a) We amortize debt discounts and premiums to interest expense over the term of the respective issues. (b) Portions of our payments related to this debt reduce the principal balances each year until maturity. |
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| Schedule of Maturities of Long-term Debt | The principal amounts of our long-term debt maturities as of December 31, 2014, are as follows.
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes (Tables)
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Dec. 31, 2014
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| Income Tax Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Income Tax Expense Components | Income tax expense is comprised of the following components.
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| Deferred Tax Assets and Liabilities | Deferred tax assets and liabilities are reflected on our consolidated balance sheets as follows.
The tax effect of the temporary differences and carryforwards that comprise our deferred tax assets and deferred tax liabilities are summarized in the following table.
_______________
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| Effective Income Tax Rate Reconciliation | The difference between the effective income tax rates and the federal statutory income tax rates are as follows.
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| Unrecognized Income Tax Benefits Reconciliation | A reconciliation of the beginning and ending amounts of unrecognized income tax benefits is as follows:
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- Details
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- Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans (Tables)
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12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Benefit Obligation Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet | The following tables summarize the status of our pension and post-retirement benefit plans.
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| Schedule Of Benefit Obligations In Excess Of Fair Value Of Plan Assets And Assumptions Used For Benefit Obligation |
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| Schedule Of Net Benefit Costs And Assumptions Used For Net Periodic Cost | Following is additional information regarding our pension and post-retirement benefit plans.
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| Schedule Of Amounts To Be Amortized From Regulatory Assets To Net Periodic Cost | We estimate that we will amortize the following amounts from regulatory assets into net periodic cost in 2015.
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| Schedule of Health Care Cost Trend Rates | For measurement purposes, the assumed annual health care cost growth rates were as follows.
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| Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | The health care cost trend rate affects the projected benefit obligation. A 1% change in assumed health care cost growth rates would have effects shown in the following table.
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| Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets | The following table provides a reconciliation of pension plan assets measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
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| Schedule of Expected Benefit Payments | Cash Flows The following table shows the expected cash flows for our pension and post-retirement benefit plans for future years.
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| Schedule of Compensation Expense and Income Tax Benefits Related to Stock Compensation Arrangements | The table below shows compensation expense and income tax benefits related to stock-based compensation arrangements that are included in our net income.
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Other Postretirement Benefit Plans, Defined Benefit [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Allocation of Plan Assets | The following table provides the fair value of our post-retirement benefit plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
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Pension Benefits [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Allocation of Plan Assets | The following table provides the fair value of our pension plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
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RSU Awards With Performance Measures [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Restricted Stock Units Award Activity | During the years ended December 31, 2014, 2013 and 2012, our RSU activity for awards with performance measures was as follows.
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RSU Awards With Only Service Requirements [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Restricted Stock Units Award Activity | During the years ended December 31, 2014, 2013 and 2012, our RSU activity for awards with only service requirements was as follows.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the changes in outstanding nonvested shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Schedule Of Amounts To Be Amortized From Regulatory Assets To Net Periodic Cost [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Benefit Obligation Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Benefit Obligations In Excess Of Fair Value Of Plan Assets And Assumptions Used For Benefit Obligation [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Net Benefit Costs And Assumptions Used For Net Periodic Cost [Table Text Block] No definition available.
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Wolf Creek Employee Benefit Plans (Tables)
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12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Wolf Creek Interim Pension And Post-Retirement Benefit Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Benefit Obligation Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet | The following tables summarize the status of our pension and post-retirement benefit plans.
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| Schedule Of Benefit Obligations In Excess Of Fair Value Of Plan Assets And Assumptions Used For Benefit Obligation |
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| Schedule Of Net Benefit Costs And Assumptions Used For Net Periodic Cost | Following is additional information regarding our pension and post-retirement benefit plans.
_______________
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| Schedule Of Amounts To Be Amortized From Regulatory Assets To Net Periodic Cost | We estimate that we will amortize the following amounts from regulatory assets into net periodic cost in 2015.
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| Schedule of Health Care Cost Trend Rates | For measurement purposes, the assumed annual health care cost growth rates were as follows.
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| Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | The health care cost trend rate affects the projected benefit obligation. A 1% change in assumed health care cost growth rates would have effects shown in the following table.
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| Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets | The following table provides a reconciliation of pension plan assets measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
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| Schedule of Expected Benefit Payments | Cash Flows The following table shows the expected cash flows for our pension and post-retirement benefit plans for future years.
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Wolf Creek [Member]
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| Wolf Creek Interim Pension And Post-Retirement Benefit Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule Of Benefit Obligation Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet | The following tables summarize the status of KGE's 47% share of the Wolf Creek pension and post-retirement benefit plans.
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| Schedule Of Benefit Obligations In Excess Of Fair Value Of Plan Assets And Assumptions Used For Benefit Obligation |
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| Schedule Of Net Benefit Costs And Assumptions Used For Net Periodic Cost | Following is additional information regarding KGE's 47% share of the Wolf Creek pension and other post-retirement benefit plans.
_______________
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| Schedule Of Amounts To Be Amortized From Regulatory Assets To Net Periodic Cost | We estimate that we will amortize the following amounts from regulatory assets into net periodic cost in 2015.
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| Schedule of Health Care Cost Trend Rates | For measurement purposes, the assumed annual health care cost growth rates were as follows.
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| Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | The health care cost trend rate affects the projected benefit obligation. A 1% change in assumed health care cost growth rates would have effects shown in the following table.
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| Schedule of Allocation of Plan Assets | The following table provides the fair value of KGE's 47% share of Wolf Creek's pension plan assets and the corresponding level of hierarchy as of December 31, 2014 and 2013.
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| Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets | The following table provides a reconciliation of KGE's 47% share of Wolf Creek's pension plan assets measured at fair value using significant level 3 inputs for the years ended December 31, 2014 and 2013.
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| Schedule of Expected Benefit Payments | The following table shows our expected cash flows for KGE's 47% share of Wolf Creek's pension and post-retirement benefit plans for future years.
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| X | ||||||||||
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- Definition
Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Schedule Of Amounts To Be Amortized From Regulatory Assets To Net Periodic Cost [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Benefit Obligation Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Benefit Obligations In Excess Of Fair Value Of Plan Assets And Assumptions Used For Benefit Obligation [Table Text Block] No definition available.
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| X | ||||||||||
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- Definition
Schedule Of Net Benefit Costs And Assumptions Used For Net Periodic Cost [Table Text Block] No definition available.
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| X | ||||||||||
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- Details
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Commitments And Contingencies (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||
| Committed Purchase Obligations Disclosure | The yearly detail of the aggregate amount of required payments as of December 31, 2014, was as follows.
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- Details
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| X | ||||||||||
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- Definition
Committed Purchase Obligations [Table Text Block] No definition available.
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Asset Retirement Obligations (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Asset Retirement Obligation [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Asset Retirement Obligations [Table Text Block] | The following table summarizes our legal AROs included on our consolidated balance sheets in long-term liabilities.
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the carrying amount of a liability for asset retirement obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Common and Preferred Stock (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Schedule of Forward Contracts Indexed to Issuer's Equity [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Instruments Not Subject to Mandatory Redemption Disclosure [Table Text Block] | The table below shows the redemption amounts for all series of preferred stock.
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| Schedule of Forward Contracts Indexed to Issuer's Equity [Table Text Block] | The following table summarizes our common stock activity pursuant to the three forward sale agreements.
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| X | ||||||||||
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- Definition
Tabular disclosure of freestanding forward contracts issued by an entity that are indexed to, and potentially settled in an entity's own stock. The disclosure may include, but not be limited to: (i) the forward rate and the number of shares to which the contract is indexed, (ii) the settlement date or dates of the contract, (iii) the issuer's accounting for the contract, (iv) settlement alternatives (if applicable) including who controls the settlement alternatives and the maximum number of shares that could be required to be issued to net share settle the contract (if applicable), (v) the fact that a potentially infinite number of shares may be required to be issued to settle the contract, if a contract does not have a stated fixed or determinable maximum number of shares, and (vi) the contract's current fair value for each settlement alternative and how changes in the price of the issuer's equity instruments affect those settlement amounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Financial Instruments Not Subject to Mandatory Redemption Disclosure [Table Text Block] No definition available.
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| X | ||||||||||
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- Details
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Variable Interest Entities (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Variable Interest Entities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets And Liabilities In Relation To VIEs | We have recorded the following assets and liabilities on our consolidated balance sheets related to the VIEs described above.
_______________ (a) Included in long-term regulatory assets on our consolidated balance sheets. (b) Included in accrued interest on our consolidated balance sheets. |
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| X | ||||||||||
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- Definition
Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Leases (Tables)
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12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Leases [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating Leases, Minimum Annual Rental Payments | Rental expense and estimated future commitments under operating leases are as follows.
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| Assets Recorded Under Capital Leases | Assets recorded under capital leases are listed below.
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| Capital Leases, Minimum Annual Rental Payments | Minimum annual rental payments, excluding administrative costs such as property taxes, insurance and maintenance, under capital leases are listed below.
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- Details
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- Definition
Tabular disclosure of long-lived, depreciable assets that are subject to a lease meeting the criteria for capitalization and are used in the normal conduct of business to produce goods and services. Examples may include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Quarterly Results (Unaudited) (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Quarterly Financial Information | Our business is seasonal in nature and, in our opinion, comparisons between the quarters of a year do not give a true indication of overall trends and changes in operations.
_______________
_______________
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Description Of Business (Details)
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12 Months Ended |
|---|---|
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Dec. 31, 2014
Customers
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of customers in Kansas | 698,000 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number Of Customers Getting Electric Generation, Transmission And Distribution Services No definition available.
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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Nov. 01, 2013
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Oct. 31, 2012
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Oct. 27, 2011
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| Property, Plant and Equipment [Line Items] | ||||||
| Estimated Increase In Annual Retail Revenues For Energy Efficiency Costs | $ 5.0 | $ 1.3 | $ 1.1 | |||
| Average annual composite basis group depreciation rates | 2.40% | 2.50% | 2.60% | |||
| Unbilled revenue | 61.0 | 60.1 | ||||
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Nuclear Fuel [Member]
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| Property, Plant and Equipment [Line Items] | ||||||
| Accumulated amortization | 72.3 | 46.2 | ||||
| Nuclear fuel charged to fuel and purchased power expense | $ 27.3 | $ 26.5 | $ 28.3 | |||
| X | ||||||||||
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- Definition
Accumulated amortization of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs, deferred acquisition costs of insurance companies, or deferred leasing costs for real estate operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Composite depreciation rate for public utility plants in service. No definition available.
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| X | ||||||||||
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- Definition
Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. No definition available.
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| X | ||||||||||
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- Definition
Amount of operating expense for fuel used by regulated operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Estimated Increase In Annual Retail Revenues For Energy Efficiency Costs No definition available.
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Summary Of Significant Accounting Policies (Fuel Inventory And Supplies) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Public Utilities, Inventory [Line Items] | ||
| Total | $ 247,406 | $ 239,511 |
|
Fuel Inventory [Member]
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| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | 70,416 | 78,368 |
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Supplies [Member]
|
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| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | $ 176,990 | $ 161,143 |
| X | ||||||||||
|
- Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The period end amount for a type of inventory held by the utility in a schedule of inventories. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Summary Of Significant Accounting Policies (Allowance For Funds Used During Construction) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
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Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Accounting Policies [Abstract] | |||
| Public Utilities, Allowance for Funds Used During Construction, Additions | $ 29,073 | $ 25,849 | $ 22,105 |
| Allowance for Funds Used During Construction, Capitalized Interest | $ 12,044 | $ 11,706 | $ 10,399 |
| Average AFUDC rates | 6.70% | 4.80% | 5.00% |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount capitalized of allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Effective rate, including composite rate, of cost of financing additions to qualifying regulated assets, commonly called allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary Of Significant Accounting Policies (Depreciable Lives of PP&E) (Details)
|
12 Months Ended |
|---|---|
|
Dec. 31, 2014
|
|
|
Minimum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Transmission facilities, estimated useful life | 15 years |
| Distribution facilities, estimated useful life | 22 years |
| Other property, plant and equipment, estimated useful life | 5 years |
|
Maximum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Transmission facilities, estimated useful life | 75 years |
| Distribution facilities, estimated useful life | 68 years |
| Other property, plant and equipment, estimated useful life | 30 years |
|
Fossil Fuel Plant [Member] | Minimum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 6 years |
|
Fossil Fuel Plant [Member] | Maximum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 78 years |
|
Nuclear Plant [Member] | Minimum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 55 years |
|
Nuclear Plant [Member] | Maximum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 71 years |
|
Other Plant in Service [Member] | Minimum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 19 years |
|
Other Plant in Service [Member] | Maximum [Member]
|
|
| Depreciable Lives [Line Items] | |
| Generating facilities, estimated useful life | 20 years |
| X | ||||||||||
|
- Definition
Useful life of utility distribution assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
|
- Definition
Useful life of utility generation assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
|
- Definition
Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
|
- Definition
Useful life of utility transmission equipment owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
|
| X | ||||||||||
|
- Details
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|
Summary Of Significant Accounting Policies (Cash Surrender Value of Life Insurance) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Accounting Policies [Abstract] | ||
| Cash surrender value of policies | $ 1,306,777 | $ 1,289,457 |
| Borrowings against policies | (1,173,956) | (1,156,341) |
| Corporate-owned life insurance, net | $ 132,821 | $ 133,116 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Corporate Owned Life Insurance, Borrowings No definition available.
|
|
Summary Of Significant Accounting Policies (Reconciliation Of Basic And Diluted EPS) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
||||||||||||||||
| Accounting Policies [Abstract] | ||||||||||||||||||||||||||
| Net income | $ 322,325 | $ 300,863 | $ 282,462 | |||||||||||||||||||||||
| Less: Net income attributable to noncontrolling interests | 9,066 | 8,343 | 7,316 | |||||||||||||||||||||||
| Net income attributable to Westar Energy, Inc. | 313,259 | 292,520 | 275,146 | |||||||||||||||||||||||
| Less: Preferred dividends | 0 | 0 | 1,616 | |||||||||||||||||||||||
| Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted | 790 | 810 | 778 | |||||||||||||||||||||||
| Net income allocated to common stock | $ 312,469 | $ 291,710 | $ 272,752 | |||||||||||||||||||||||
| Weighted average equivalent common shares outstanding - basic | 130,014,941 | 127,462,994 | 126,711,869 | |||||||||||||||||||||||
| RSUs | 181,397 | 17,195 | 97,757 | |||||||||||||||||||||||
| Forward sale agreements | 2,628,187 | 818,505 | 89,160 | |||||||||||||||||||||||
| Weighted average equivalent common shares outstanding - diluted | 132,824,525 | [1] | 128,298,694 | [1] | 126,898,786 | [1] | ||||||||||||||||||||
| Basic earnings per common share | $ 0.33 | [2] | $ 1.13 | [2] | $ 0.41 | [2] | $ 0.53 | [2] | $ 0.32 | [2] | $ 1.04 | [2] | $ 0.53 | [2] | $ 0.40 | [2] | $ 2.40 | $ 2.29 | $ 2.15 | |||||||
| Diluted earnings per common share | $ 0.32 | [2] | $ 1.10 | [2] | $ 0.40 | [2] | $ 0.52 | [2] | $ 0.32 | [2] | $ 1.04 | [2] | $ 0.52 | [2] | $ 0.40 | [2] | $ 2.35 | $ 2.27 | $ 2.15 | |||||||
| Antidilutive shares | 0 | 0 | 0 | |||||||||||||||||||||||
|
||||||||||||||||||||||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Earnings distributed and earnings allocated to common stock under the two-class method. No definition available.
|
| X | ||||||||||
|
- Definition
Additional common shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward sale agreements using the treasury stock method. No definition available.
|
|
Summary Of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Cash Paid For (Received From) | |||
| Interest on financing activities | $ 160,292 | $ 148,691 | $ 143,564 |
| Income taxes, net of refunds | 458 | (11) | (4,378) |
| Noncash Investing and Financing Transactions | |||
| Property, plant and equipment additions | 143,192 | 127,544 | 89,354 |
| Issuance of common stock for reinvested dividends and compensation plans | 9,155 | 9,641 | 9,089 |
| Assets acquired through capital leases | 8,717 | 334 | 10,683 |
|
Variable Interest Entity, Primary Beneficiary [Member]
|
|||
| Cash Paid For (Received From) | |||
| Interest on financing activities | 12,183 | 13,892 | 16,214 |
| Noncash Investing and Financing Transactions | |||
| Property, plant and equipment additions | (7,342) | (14,282) | 0 |
| Debt of VIEs | $ (7,342) | $ (14,282) | $ 0 |
| X | ||||||||||
|
- Definition
The increase during the period in capital lease obligations due to entering into new capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value of stock issued in noncash financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Rate Matters And Regulation (Regulatory Assets and Liabilities) (Details) (USD $)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | $ 859,778,000 | $ 755,414,000 |
| Regulatory Liabilities | 343,485,000 | 329,556,000 |
|
Removal Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 88,242,000 | 114,148,000 |
|
Deferred Regulatory Gain From Sale Leaseback [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 81,055,000 | 86,551,000 |
|
Nuclear Decommissioning [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 43,641,000 | 43,272,000 |
|
Retail Energy Cost Adjustment [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 33,274,000 | 15,414,000 |
|
Kansas Tax Credits [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 12,725,000 | 11,076,000 |
|
jurisdictional allowance for funds used during construction [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 33,103,000 | 7,893,000 |
|
Dismantling Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 22,918,000 | 20,505,000 |
|
Gain on Sale of Oil [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 2,337,000 | 4,278,000 |
|
Other Post-retirement Benefit Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 15,473,000 | 19,000,000 |
|
Fuel Supply and Electricity Contracts [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 1,738,000 | 2,635,000 |
|
Other Regulatory Liabilities [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Liabilities | 8,979,000 | 4,784,000 |
|
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 399,800,000 | |
|
Pension Cost [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 35,800,000 | |
| Deferred Employee Benefit Costs Amortization Expense, Next Twelve Months | 9,800,000 | |
|
Deferred Employee Benefit Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 435,590,000 | 277,122,000 |
| Deferred Employee Benefit Costs Amortization Expense, Next Twelve Months | 39,500,000 | |
|
Amounts Due From Customers For Future Income Taxes, Net [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 153,984,000 | 163,742,000 |
|
Depreciation [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 68,422,000 | 71,047,000 |
|
Debt Reacquisition Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 61,079,000 | 63,882,000 |
|
Asset Retirement Obligation [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 26,106,000 | 23,555,000 |
|
Ad Valorem Tax [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 39,428,000 | 34,492,000 |
|
Energy Efficiency Program Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 8,933,000 | 14,477,000 |
|
Disallowed Plant Costs [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 15,809,000 | 15,964,000 |
|
Cash Flow Hedging [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 27,594,000 | |
|
Retail Energy Cost Adjustment [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 0 | 22,138,000 |
|
Nuclear Refueling [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 11,165,000 | 29,026,000 |
|
Other Regulatory Assets [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | 12,648,000 | 12,375,000 |
|
Cash Flow Hedging [Member]
|
||
| Regulatory Assets and Liabilities [Line Items] | ||
| Regulatory Assets | $ 26,614,000 | $ 27,600,000 |
| X | ||||||||||
|
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Rate Matters And Regulation (Narrative) (Details) (USD $)
|
12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Nov. 01, 2013
|
Jun. 30, 2013
|
Mar. 01, 2013
|
Jan. 31, 2013
|
Oct. 31, 2012
|
Jun. 30, 2012
|
Apr. 30, 2012
|
Jan. 31, 2012
|
Oct. 27, 2011
|
Jun. 30, 2011
|
Apr. 01, 2011
|
Jan. 31, 2011
|
|
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Liabilities | $ 343,485,000 | $ 329,556,000 | |||||||||||||
| Depreciation, Amortization and Accretion, Net | 286,442,000 | 272,593,000 | 270,464,000 | ||||||||||||
| Change in Depreciation Estimate | 43,600,000 | ||||||||||||||
| Environmental Upgrades of Jointly Owned Utility Plant | 1,200,000,000 | ||||||||||||||
| Entity Share of Environmental Upgrades of Jointly Owned Plant | 610,000,000 | ||||||||||||||
| Estimated Increase In Annual Retail Revenues For Environmental Costs | 11,000,000 | 27,300,000 | 19,500,000 | ||||||||||||
| Proposed Increase In Annual Retail Revenues | 4,000,000 | 30,700,000 | 50,000,000 | ||||||||||||
| Estimated Increase In Annual Retail Revenues For Transmission Costs | 41,000,000 | 11,800,000 | 36,700,000 | ||||||||||||
| Estimated Increase In Annual Retail Revenues For Energy Efficiency Costs | 5,000,000 | 1,300,000 | 1,100,000 | ||||||||||||
| Estimated Increase In Annual Revenues For Property Tax | 12,700,000 | 15,200,000 | 5,900,000 | ||||||||||||
| Estimated Increase In Annual Transmission Revenues | 44,300,000 | 12,200,000 | 38,200,000 | ||||||||||||
|
La Cygne Generating Station [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Ownership Percentage | 50.00% | ||||||||||||||
|
Retail Energy Cost Adjustment [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Liabilities | 33,274,000 | 15,414,000 | |||||||||||||
| Regulatory Liability, Amortization Period | 1 | ||||||||||||||
|
Postretirement Benefit Costs [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Liabilities | 15,473,000 | 19,000,000 | |||||||||||||
| Regulatory Liability, Amortization Period | 5 | ||||||||||||||
|
Gain on Sale of Oil [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Liabilities | 2,337,000 | 4,278,000 | |||||||||||||
| Regulatory Liability, Amortization Period | 3 | ||||||||||||||
|
Pension Cost [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Deferred Employee Benefit Costs Amortization Expense, Next Twelve Months | 9,800,000 | ||||||||||||||
| Regulatory Asset, Amortization Period | 5 | ||||||||||||||
|
Deferred Employee Benefit Costs [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Deferred Employee Benefit Costs Amortization Expense, Next Twelve Months | 39,500,000 | ||||||||||||||
|
Ad Valorem Tax [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Asset, Amortization Period | 1 | ||||||||||||||
|
Energy Efficiency Program Costs [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Asset, Amortization Period | 1 | ||||||||||||||
|
Retail Energy Cost Adjustment [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Regulatory Asset, Amortization Period | 1 | ||||||||||||||
|
Regulatory Assets Increase [Member]
|
|||||||||||||||
| Regulatory Assets and Liabilities [Line Items] | |||||||||||||||
| Depreciation, Amortization and Accretion, Net | $ 20,000,000 | ||||||||||||||
| X | ||||||||||
|
- Definition
The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
ChangeinDepreciationEstimate No definition available.
|
| X | ||||||||||
|
- Definition
The total amount of environmental upgrades at a jointly owned utility plant. No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Energy Efficiency Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Environmental Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Transmission Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Revenues For Property Tax No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Transmission Revenues No definition available.
|
| X | ||||||||||
|
- Definition
Entity's share of the total amount of proposed environmental upgrades at a jointly owned utility plant. No definition available.
|
| X | ||||||||||
|
- Definition
Proposed Increase In Annual Retail Revenues No definition available.
|
| X | ||||||||||
|
- Definition
Regulatory Asset Amortization Period No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Regulatory Liability, Amortization Period No definition available.
|
| X | ||||||||||
|
- Definition
The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
|
|
Financial Instruments and Trading Securities (Narrative) (Details) (USD $)
|
12 Months Ended | 0 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Jan. 20, 2012
Cash Flow Hedging [Member]
|
Dec. 31, 2014
Cash Flow Hedging [Member]
|
Dec. 31, 2013
Cash Flow Hedging [Member]
|
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||
| Revised ARO estimate | $ 9,580,000 | $ 0 | ||||
| Derivative Liability, Notional Amount | 125,000,000 | |||||
| Interest rate cash flow hedge settlement cost | 29,700,000 | |||||
| Regulatory Assets | $ 859,778,000 | $ 755,414,000 | $ 26,614,000 | $ 27,600,000 | ||
| X | ||||||||||
|
- Definition
Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Nominal or face amount used to calculate payments on the derivative liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Derivative Instruments Gain Loss Recognized No definition available.
|
|
Financial Instruments and Trading Securities (Carrying Values And Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Debt Instrument [Line Items] | ||
| Carrying Value | $ 3,226,940 | $ 3,224,440 |
|
Fixed Rate Debt Member
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | 3,105,000 | 3,102,500 |
| Fair Value | 3,488,410 | 3,294,209 |
|
Fixed Rate Debt Of Variable Interest Entities [Member]
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | 194,204 | 221,682 |
| Fair Value | $ 213,579 | $ 241,241 |
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Instruments and Trading Securities (Fair Value Of Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|||
|---|---|---|---|---|---|
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | $ 185,016 | $ 175,625 | |||
| Total Trading Securities, Assets | 35,497 | [1] | 34,926 | ||
| Total Assets Measured at Fair Value | 220,513 | 210,551 | |||
|
Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 340 | 2 | |||
| Total Trading Securities, Assets | 168 | [1] | 166 | ||
| Total Assets Measured at Fair Value | 508 | 168 | |||
|
Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 152,111 | 145,620 | |||
| Total Trading Securities, Assets | 35,329 | [1] | 34,760 | ||
| Total Assets Measured at Fair Value | 187,440 | 180,380 | |||
|
Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 32,565 | 30,003 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
| Total Assets Measured at Fair Value | 32,565 | 30,003 | |||
|
Domestic Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 60,972 | 55,774 | |||
| Total Trading Securities, Assets | 18,698 | [1] | 18,075 | ||
|
Domestic Equity [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
Domestic Equity [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 54,925 | 49,957 | |||
| Total Trading Securities, Assets | 18,698 | [1] | 18,075 | ||
|
Domestic Equity [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 6,047 | 5,817 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
International Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 30,791 | 31,816 | |||
| Total Trading Securities, Assets | 4,252 | [1] | 4,519 | ||
|
International Equity [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
International Equity [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 30,791 | 31,816 | |||
| Total Trading Securities, Assets | 4,252 | [1] | 4,519 | ||
|
International Equity [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
Core Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 19,289 | 18,107 | |||
| Total Trading Securities, Assets | 12,379 | [1] | 12,166 | ||
|
Core Bonds [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
Core Bonds [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 19,289 | 18,107 | |||
| Total Trading Securities, Assets | 12,379 | [1] | 12,166 | ||
|
Core Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
High-Yield Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 13,198 | 12,902 | |||
|
High-Yield Bonds [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
High-Yield Bonds [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 13,198 | 12,902 | |||
|
High-Yield Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Emerging Market Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 10,988 | 11,055 | |||
|
Emerging Market Bonds [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | ||||
|
Emerging Market Bonds [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 10,988 | 11,055 | |||
|
Emerging Market Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | ||||
|
Other Fixed Income [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 4,779 | 4,690 | |||
|
Other Fixed Income [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Other Fixed Income [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 4,779 | 4,690 | |||
|
Other Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Combination Debt and Equity Fund [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 18,141 | 17,093 | |||
|
Combination Debt and Equity Fund [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Combination Debt and Equity Fund [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 18,141 | 17,093 | |||
|
Combination Debt and Equity Fund [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Alternative Investments [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 16,970 | 15,675 | |||
|
Alternative Investments [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Alternative Investments [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 16,970 | 15,675 | |||
|
Real Estate Securities [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 9,548 | 8,511 | |||
|
Real Estate Securities [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Real Estate Securities [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
|
Real Estate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 9,548 | 8,511 | |||
|
Cash Equivalents [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 340 | 2 | |||
| Total Trading Securities, Assets | 168 | [1] | 166 | ||
|
Cash Equivalents [Member] | Level 1 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 340 | 2 | |||
| Total Trading Securities, Assets | 168 | [1] | 166 | ||
|
Cash Equivalents [Member] | Level 2 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | 0 | [1] | 0 | ||
|
Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 0 | 0 | |||
| Total Trading Securities, Assets | $ 0 | [1] | $ 0 | ||
|
|||||
| X | ||||||||||
|
- Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Instruments and Trading Securities (Reconciliations Of Assets And Liabilities At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Balance at period start | $ 30,003 | $ 12,764 |
| Regulatory liabilities | 2,723 | 2,261 |
| Purchases | 686 | 15,628 |
| Sales | (847) | (650) |
| Balance at period end | 32,565 | 30,003 |
|
Domestic Equity [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Balance at period start | 5,817 | 4,899 |
| Regulatory liabilities | 391 | 940 |
| Purchases | 335 | 341 |
| Sales | (496) | (363) |
| Balance at period end | 6,047 | 5,817 |
|
Alternative Investments [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Balance at period start | 15,675 | 0 |
| Regulatory liabilities | 1,295 | 675 |
| Purchases | 0 | 15,000 |
| Sales | 0 | 0 |
| Balance at period end | 16,970 | 15,675 |
|
Real Estate Securities [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Balance at period start | 8,511 | 7,865 |
| Regulatory liabilities | 1,037 | 646 |
| Purchases | 351 | 287 |
| Sales | (351) | (287) |
| Balance at period end | $ 9,548 | $ 8,511 |
| X | ||||||||||
|
- Definition
Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory liabilities on the statement of financial position. No definition available.
|
|
Financial Instruments and Trading Securities (Unrealized Gains And Losses On Financial Statements) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Regulatory liabilities | $ 1,876 | $ 1,611 |
|
Domestic Equity [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Regulatory liabilities | (105) | 577 |
|
Alternative Investments [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Regulatory liabilities | 1,296 | 675 |
|
Real Estate Securities [Member]
|
||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||
| Regulatory liabilities | $ 685 | $ 359 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents total unrealized gains or losses for the period arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory liabilities on the statement of financial position. No definition available.
|
|
Financial Instruments and Trading Securities (Investments In Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||
|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction Period | 15 years | ||||
| Total Nuclear Decommissioning Trust | $ 185,016 | $ 175,625 | |||
| Total Trading Securities, Assets | 35,497 | [1] | 34,926 | ||
| Total | 220,513 | 210,551 | |||
|
Alternative Investments [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 16,970 | 15,675 | |||
|
Real Estate Securities [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 9,548 | 8,511 | |||
|
International Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 30,791 | 31,816 | |||
| Total Trading Securities, Assets | 4,252 | [1] | 4,519 | ||
|
Core Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 19,289 | 18,107 | |||
| Total Trading Securities, Assets | 12,379 | [1] | 12,166 | ||
|
Domestic Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 60,972 | 55,774 | |||
| Total Trading Securities, Assets | 18,698 | [1] | 18,075 | ||
|
Fair Value [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 32,565 | 30,003 | |||
| Total Trading Securities, Assets | 35,329 | 34,760 | |||
| Total | 67,894 | 64,763 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 2,348 | 2,683 | |||
|
Fair Value [Member] | Alternative Investments [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 16,970 | 15,675 | |||
|
Fair Value [Member] | Real Estate Securities [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 9,548 | 8,511 | |||
|
Fair Value [Member] | International Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Trading Securities, Assets | 4,252 | 4,519 | |||
|
Fair Value [Member] | Core Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Trading Securities, Assets | 12,379 | 12,166 | |||
|
Fair Value [Member] | Domestic Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Total Nuclear Decommissioning Trust | 6,047 | 5,817 | |||
| Total Trading Securities, Assets | 18,698 | 18,075 | |||
|
Decommissioning Trust Assets [Member] | Fair Value [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 2,348 | 2,683 | |||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Alternative Investments [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | quarterly | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Real Estate Securities [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | Quarterly | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 80 days | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Domestic Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 2,348 | 2,683 | |||
|
Trading Securities [Member] | Fair Value [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | |||
|
Trading Securities [Member] | Fair Value [Member] | International Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | Upon Notice | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 1 day | ||||
|
Trading Securities [Member] | Fair Value [Member] | Core Bonds [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | Upon Notice | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 1 day | ||||
|
Trading Securities [Member] | Fair Value [Member] | Domestic Equity [Member]
|
|||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 | $ 0 | |||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency | Upon Notice | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 1 day | ||||
|
|||||
| X | ||||||||||
|
- Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Remaining period of a redemption restriction related to investments for which net asset value per share is calculated, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Instruments and Trading Securities (Changes In The Fair Value Of Commodity Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Asset Retirement Obligation, Revision of Estimate | $ 9,580 | $ 0 |
| X | ||||||||||
|
- Definition
Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Investments (Narrative) (Details) (USD $)
|
12 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
||||
| Schedule of Available-for-sale Securities [Line Items] | ||||||
| Total Trading Securities, Assets | $ 35,497,000 | [1] | $ 34,926,000 | |||
| Unrealized gains (losses) on trading securities | 2,600,000 | 6,700,000 | 4,100,000 | |||
| Realized gains (losses) on available-for-sale-securities | 100,000 | 5,300,000 | 600,000 | |||
|
Supplemental Employee Retirement Plans, Defined Benefit [Member]
|
||||||
| Schedule of Available-for-sale Securities [Line Items] | ||||||
| Benefit obligation for certain retirement benefits | $ 29,800,000 | $ 27,000,000 | ||||
|
||||||
| X | ||||||||||
|
- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Financial Investments (Cost And Fair Value Of Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | $ 164,088 | $ 155,244 |
| Gross Unrealized Gain | 24,770 | 23,753 |
| Gross Unrealized Loss | 3,842 | 3,372 |
| Fair Value | 185,016 | 175,625 |
| Allocation | 100.00% | 100.00% |
|
Domestic Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 46,126 | 40,976 |
| Gross Unrealized Gain | 14,853 | 14,799 |
| Gross Unrealized Loss | 7 | 1 |
| Fair Value | 60,972 | 55,774 |
| Allocation | 33.00% | 32.00% |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 27,521 | 26,581 |
| Gross Unrealized Gain | 3,683 | 5,266 |
| Gross Unrealized Loss | 413 | 31 |
| Fair Value | 30,791 | 31,816 |
| Allocation | 17.00% | 18.00% |
|
Core Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 18,811 | 18,287 |
| Gross Unrealized Gain | 478 | 0 |
| Gross Unrealized Loss | 0 | 180 |
| Fair Value | 19,289 | 18,107 |
| Allocation | 10.00% | 10.00% |
|
High-Yield Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 13,342 | 12,275 |
| Gross Unrealized Gain | 0 | 627 |
| Gross Unrealized Loss | 144 | 0 |
| Fair Value | 13,198 | 12,902 |
| Allocation | 7.00% | 7.00% |
|
Emerging Market Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 12,556 | 12,207 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | 1,568 | 1,152 |
| Fair Value | 10,988 | 11,055 |
| Allocation | 6.00% | 6.00% |
|
Other Fixed Income [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 4,798 | 4,684 |
| Gross Unrealized Gain | 0 | 6 |
| Gross Unrealized Loss | 19 | 0 |
| Fair Value | 4,779 | 4,690 |
| Allocation | 3.00% | 3.00% |
|
Combination Debt and Equity Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 14,975 | 14,964 |
| Gross Unrealized Gain | 3,786 | 2,380 |
| Gross Unrealized Loss | 620 | 251 |
| Fair Value | 18,141 | 17,093 |
| Allocation | 10.00% | 10.00% |
|
Alternative Investments [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 15,000 | 15,000 |
| Gross Unrealized Gain | 1,970 | 675 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | 16,970 | 15,675 |
| Allocation | 9.00% | 9.00% |
|
Real Estate Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 10,619 | 10,268 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | 1,071 | 1,757 |
| Fair Value | 9,548 | 8,511 |
| Allocation | 5.00% | 5.00% |
|
Cash Equivalents [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 340 | 2 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | $ 340 | $ 2 |
| X | ||||||||||
|
- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Available-for-sale Securities, Gross Unrealized Gain1 No definition available.
|
| X | ||||||||||
|
- Definition
Available-for-sale Securities, Gross Unrealized Loss1 No definition available.
|
| X | ||||||||||
|
- Definition
Available-for-sale Securities, Security Type Allocation Percentage No definition available.
|
|
Financial Investments (Fair Value And Gross Unrealized Losses Of Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | $ 23,882 | $ 41,748 |
| Gross Unrealized Losses, Less than 12 Months | (576) | 1,615 |
| Fair Value, 12 Months or Greater | 26,691 | 8,511 |
| Gross Unrealized Losses, 12 Months or Greater | (3,266) | 1,757 |
| Fair Value, Total | 50,573 | 50,259 |
| Gross Unrealized Losses, Total | 3,842 | (3,372) |
|
Domestic Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 0 | 59 |
| Gross Unrealized Losses, Less than 12 Months | 0 | 1 |
| Fair Value, 12 Months or Greater | 263 | 0 |
| Gross Unrealized Losses, 12 Months or Greater | 7 | 0 |
| Fair Value, Total | 263 | 59 |
| Gross Unrealized Losses, Total | (7) | (1) |
|
Combination Debt Equity And Other Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 0 | 6,283 |
| Gross Unrealized Losses, Less than 12 Months | 0 | 251 |
| Fair Value, 12 Months or Greater | 5,892 | 0 |
| Gross Unrealized Losses, 12 Months or Greater | 620 | 0 |
| Fair Value, Total | 5,892 | 6,283 |
| Gross Unrealized Losses, Total | (620) | (251) |
|
Real Estate [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 0 | 0 |
| Gross Unrealized Losses, Less than 12 Months | 0 | 0 |
| Fair Value, 12 Months or Greater | 9,548 | 8,511 |
| Gross Unrealized Losses, 12 Months or Greater | 1,071 | 1,757 |
| Fair Value, Total | 9,548 | 8,511 |
| Gross Unrealized Losses, Total | (1,071) | (1,757) |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 5,905 | 6,244 |
| Gross Unrealized Losses, Less than 12 Months | 413 | 31 |
| Fair Value, 12 Months or Greater | 0 | 0 |
| Gross Unrealized Losses, 12 Months or Greater | 0 | 0 |
| Fair Value, Total | 5,905 | 6,244 |
| Gross Unrealized Losses, Total | (413) | (31) |
|
High-Yield Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 13,198 | |
| Gross Unrealized Losses, Less than 12 Months | 144 | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 13,198 | |
| Gross Unrealized Losses, Total | (144) | |
|
Core Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 18,107 | |
| Gross Unrealized Losses, Less than 12 Months | 180 | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 18,107 | |
| Gross Unrealized Losses, Total | (180) | |
|
Emerging Market Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 0 | 11,055 |
| Gross Unrealized Losses, Less than 12 Months | 0 | 1,152 |
| Fair Value, 12 Months or Greater | 10,988 | 0 |
| Gross Unrealized Losses, 12 Months or Greater | 1,568 | 0 |
| Fair Value, Total | 10,988 | 11,055 |
| Gross Unrealized Losses, Total | (1,568) | (1,152) |
|
Other Fixed Income [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 4,779 | |
| Gross Unrealized Losses, Less than 12 Months | 19 | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 4,779 | |
| Gross Unrealized Losses, Total | $ (19) | |
| X | ||||||||||
|
- Definition
Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized loss on securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Property, Plant And Equipment (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Electric plant in service | $ 10,620,292 | $ 9,753,787 |
| Electric plant acquisition adjustment | (802,318) | (802,318) |
| Accumulated depreciation | (4,112,483) | (3,971,735) |
| Electric plant, net | 7,310,127 | 6,584,370 |
| Construction work in progress | 773,144 | 904,586 |
| Nuclear fuel, net | 79,637 | 62,960 |
| Property, plant and equipment, net | 8,162,908 | 7,551,916 |
|
Variable Interest Entity [Member]
|
||
| Public Utility, Property, Plant and Equipment [Line Items] | ||
| Electric plant in service | 497,999 | 513,793 |
| Accumulated depreciation | (219,426) | (217,167) |
| Property, plant and equipment, net | $ 278,573 | $ 296,626 |
| X | ||||||||||
|
- Definition
The carrying amount as of the balance sheet of nuclear fuel held as property plant and equipment. This amount is net of amortization based on the energy produced over the life of the fuel. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities. No definition available.
|
| X | ||||||||||
|
- Definition
Period end amount of construction work in progress in public utility. No definition available.
|
| X | ||||||||||
|
- Definition
Period end amount of total gross PPE. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Property Plant And Equipment Excluding Construction Work In Progress And Net Nuclear Fuel No definition available.
|
|
Property, Plant And Equipment (Depreciation) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Public Utility, Property, Plant and Equipment [Line Items] | |||
| Depreciation | $ 263.8 | $ 249.9 | $ 247.8 |
|
Variable Interest Entity [Member]
|
|||
| Public Utility, Property, Plant and Equipment [Line Items] | |||
| Depreciation | $ 9.7 | $ 9.7 | $ 9.8 |
| X | ||||||||||
|
- Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Joint Ownership of Utility Plants Joint Ownership of Utility Plants (Details) (USD $)
|
12 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
MW
|
Dec. 31, 2013
|
Dec. 31, 2014
La Cygne unit 1 [Member]
MW
|
Dec. 31, 2014
JEC unit 1 [Member]
MW
|
Dec. 31, 2014
JEC unit 2 [Member]
MW
|
Dec. 31, 2014
JEC unit 3 [Member]
MW
|
Dec. 31, 2014
Wolf Creek [Member]
MW
|
Dec. 31, 2014
State Line [Member]
MW
|
Dec. 31, 2014
La Cygne unit 2 [Member]
MW
|
Dec. 31, 2014
La Cygne Generating Station [Member]
|
Dec. 31, 2014
Jeffrey Energy Center [Member]
|
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary [Member]
|
Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary [Member]
|
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary [Member]
La Cygne Generating Station [Member]
|
||||||||||||||
| Jointly Owned Utility Plant, Net Ownership Amount [Abstract] | |||||||||||||||||||||||||||
| Investment | $ 4,304,052,000 | $ 345,866,000 | [1] | $ 789,142,000 | [1] | $ 540,871,000 | [1] | $ 709,497,000 | [1] | $ 1,818,005,000 | [2] | $ 100,671,000 | [3] | ||||||||||||||
| Accumulated Depreciation | 1,689,781,000 | 157,550,000 | [1] | 189,973,000 | [1] | 190,769,000 | [1] | 309,540,000 | [1] | 788,602,000 | [2] | 53,347,000 | [3] | ||||||||||||||
| Construction Work in Progress | 459,385,000 | 368,445,000 | [1] | 11,150,000 | [1] | 3,189,000 | [1] | 3,246,000 | [1] | 73,333,000 | [2] | 22,000 | [3] | ||||||||||||||
| Net Capacity, in MW | 3,092 | 367 | [1] | 661 | [1] | 658 | [1] | 664 | [1] | 549 | [1] | 193 | [3] | 341 | [3] | ||||||||||||
| Ownership Percentage | 47.00% | 50.00% | [1] | 92.00% | [1] | 92.00% | [1] | 92.00% | [1] | 47.00% | [2] | 40.00% | [3] | ||||||||||||||
| Variable Interest Entity Percentage of Asset Held | 50.00% | 8.00% | |||||||||||||||||||||||||
| VIE Investment in Property, Plant and Equipment | 392,100,000 | ||||||||||||||||||||||||||
| Accumulated Depreciation on VIE Investment in Property, Plant and Equipment | $ 4,112,483,000 | $ 3,971,735,000 | $ 219,426,000 | $ 217,167,000 | $ 194,500,000 | ||||||||||||||||||||||
|
|||||||||||||||||||||||||||
| X | ||||||||||
|
- Definition
The period end amount owned by the reporting utility of a jointly owned utility plant in service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The period end amount of construction work in progress at a jointly owned electricity generation plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The period end amount of accumulated depreciation in a jointly owned electricity generation plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. No definition available.
|
| X | ||||||||||
|
- Definition
Net capacity, in megawatts No definition available.
|
| X | ||||||||||
|
- Definition
The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
|
|
Short-Term Debt (Details) (USD $)
|
12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2014
Commercial Paper and Revolving LIne of Credit [Member]
|
Dec. 31, 2013
Commercial Paper and Revolving LIne of Credit [Member]
|
Dec. 31, 2014
Commercial Paper [Member]
days
|
Dec. 31, 2013
Commercial Paper [Member]
|
Dec. 31, 2014
Revolving Credit Facility Lender One [Member]
|
Sep. 01, 2014
Revolving Credit Facility Lender One [Member]
|
Dec. 31, 2013
Revolving Credit Facility Lender One [Member]
|
Sep. 29, 2011
Revolving Credit Facility Lender One [Member]
|
Dec. 31, 2014
Revolving Credit Facility Lender Two [Member]
|
Feb. 01, 2014
Revolving Credit Facility Lender Two [Member]
|
Dec. 31, 2013
Revolving Credit Facility Lender Two [Member]
|
Sep. 29, 2011
Revolving Credit Facility Lender Two [Member]
|
|
| Short-term Debt [Line Items] | |||||||||||||||
| Expected extended amount for line of credit | $ 1,000,000,000 | $ 400,000,000 | |||||||||||||
| Line of credit facility expiration date | Sep. 29, 2018 | ||||||||||||||
| Line of Credit Facility, Increase(Decrease) in Maximum Borrowing Capacity | 81,400,000 | 20,000,000 | |||||||||||||
| Issued letters of credit | 15,600,000 | 18,400,000 | 0 | 0 | |||||||||||
| Secured revolving credit facility | 730,000,000 | 270,000,000 | |||||||||||||
| Short-Term Debt Maximum Borrowings | 1,000,000,000 | 1,000,000,000 | |||||||||||||
| Secured revolving credit facility borrowed | 0 | 0 | 0 | 0 | |||||||||||
| Commercial paper program, Maximim maturity period | 365 | ||||||||||||||
| Short-term debt amount outstanding | 257,600,000 | 134,600,000 | 257,600,000 | 134,600,000 | |||||||||||
| Weighted average interest rate | 0.52% | 0.28% | |||||||||||||
| Weighted average amount outstanding | 232,336,000 | 228,352,000 | |||||||||||||
| Weighted daily average interest rate, excluding fees | 0.30% | 0.39% | |||||||||||||
| Interest expense on short-term debt | $ 2,000,000 | $ 2,400,000 | $ 3,200,000 | ||||||||||||
| X | ||||||||||
|
- Definition
The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
|
| X | ||||||||||
|
- Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Date the credit facility terminates, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Weighted average interest rate of short-term debt outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Line of Credit Facility, Increase(Decrease) in Maximum Borrowing Capacity No definition available.
|
| X | ||||||||||
|
- Definition
The potential maximum aggregate borrowings available under the credit facility if option to increase is exercised. No definition available.
|
| X | ||||||||||
|
- Definition
Short-term Debt, Maximim Maturity Period No definition available.
|
| X | ||||||||||
|
- Definition
Short-term Debt, Maximum Borrowing Capacity No definition available.
|
| X | ||||||||||
|
- Definition
Weighted Daily Average Interest Rate, excluding fees No definition available.
|
|
Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
6.00% First Mortgage Bonds Due 2014 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
6.00% First Mortgage Bonds Due 2014 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
5.15% First Mortgage Bonds Due 2017 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
5.15% First Mortgage Bonds Due 2017 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
5.95% First Mortgage Bonds Due 2035 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
5.95% First Mortgage Bonds Due 2035 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
5.10% First Mortgage Bonds Due 2020 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
5.10% First Mortgage Bonds Due 2020 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
5.875% First Mortgage Bonds Due 2036 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
5.875% First Mortgage Bonds Due 2036 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
8.625% First Mortgage Bonds Due 2018 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
8.625% First Mortgage Bonds Due 2018 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
4.125% First Mortgage Bonds Due 2042 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
4.125% First Mortgage Bonds Due 2042 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Mar. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Aug. 01, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
|
Jul. 01, 2014
KGE [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
6.53% First Mortgage Bonds Due 2037 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
6.53% First Mortgage Bonds Due 2037 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
6.15% First Mortgage Bonds Due 2023 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
6.15% First Mortgage Bonds Due 2023 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
6.64% First Mortgage Bonds Due 2038 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
6.64% First Mortgage Bonds Due 2038 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
6.70% First Mortgage Bonds Due 2019 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
6.70% First Mortgage Bonds Due 2019 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2027 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2027 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
5.30% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
5.30% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
5.30% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
5.30% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
Pollution Control Bonds Variable Due 2032 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
4.85% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
4.85% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
5.00% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
5.00% Pollution Control Bonds Due 2031 [Member]
|
Dec. 31, 2014
Variable Interest Entity [Member]
|
Dec. 31, 2013
Variable Interest Entity [Member]
|
Dec. 31, 2014
Variable Interest Entity [Member]
Variable Interest Entity 6.99% due 2014 [Member]
|
Dec. 31, 2013
Variable Interest Entity [Member]
Variable Interest Entity 6.99% due 2014 [Member]
|
Dec. 31, 2014
Variable Interest Entity [Member]
Variable Interest Entity 5.92% due 2019 [Member]
|
Dec. 31, 2013
Variable Interest Entity [Member]
Variable Interest Entity 5.92% due 2019 [Member]
|
Dec. 31, 2014
Variable Interest Entity [Member]
Variable Interest Entity 5.647% due 2021 [Member]
|
Dec. 31, 2013
Variable Interest Entity [Member]
Variable Interest Entity 5.647% due 2021 [Member]
|
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term debt | $ 3,226,940 | $ 3,224,440 | $ 2,180,000 | $ 2,250,000 | $ 0 | $ 250,000 | $ 125,000 | $ 125,000 | $ 125,000 | $ 125,000 | $ 250,000 | $ 250,000 | $ 150,000 | $ 150,000 | $ 300,000 | $ 300,000 | $ 550,000 | $ 550,000 | $ 430,000 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 | $ 875,000 | $ 625,000 | $ 250,000 | $ 175,000 | $ 175,000 | $ 50,000 | $ 50,000 | $ 100,000 | $ 100,000 | $ 300,000 | $ 300,000 | $ 194,204 | $ 221,682 | $ 0 | [1] | $ 316 | [1] | $ 8,413 | [1] | $ 13,243 | [1] | $ 185,791 | [1] | $ 208,123 | [1] | ||||||||||||||||||||||||||
| Long-term pollution control bond | 75,500 | 75,500 | 45,000 | 45,000 | 30,500 | 30,500 | 96,440 | 273,940 | 21,940 | 21,940 | 0 | 108,600 | 0 | 18,900 | 14,500 | 14,500 | 10,000 | 10,000 | 50,000 | 50,000 | 0 | 50,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term debt due within one year | 0 | (250,000) | (27,933) | (27,479) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unamortized debt discount, Net | (11,401) | [2] | (5,482) | [2] | 294 | [2] | 599 | [2] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-term debt, net | $ 3,215,539 | $ 2,968,958 | $ 166,565 | $ 194,802 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Represents the current and noncurrent portions of a debt security issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Long-term Debt Maturities (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
|---|---|
| Debt Instrument [Line Items] | |
| 2013 | $ 0 |
| 2014 | 0 |
| 2015 | 125,000 |
| 2016 | 300,000 |
| 2017 | 300,000 |
| Thereafter | 2,501,940 |
|
Variable Interest Entity, Primary Beneficiary [Member]
|
|
| Debt Instrument [Line Items] | |
| 2013 | 27,933 |
| 2014 | 28,309 |
| 2015 | 26,842 |
| 2016 | 28,538 |
| 2017 | 31,485 |
| Thereafter | $ 51,097 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Long-term Debt (Narrative) (Details) (USD $)
|
12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2014
Variable Interest Entity [Member]
|
Dec. 31, 2013
Variable Interest Entity [Member]
|
Dec. 31, 2012
Variable Interest Entity [Member]
|
Dec. 31, 2014
KGE [Member]
First Mortgage Bond Series [Member]
|
Dec. 31, 2014
KGE [Member]
Secured Debt [Member]
|
Dec. 31, 2013
KGE [Member]
Secured Debt [Member]
|
Jul. 01, 2014
KGE [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Jun. 30, 2013
KGE [Member]
Pollution Control Bond Series [Member]
DebtInstruments8780And8790 [Member]
|
Jun. 01, 2013
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instrument 8780 [Member]
|
Jun. 01, 2013
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instrument 8790 [Member]
|
Jun. 30, 2014
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instrument Seventeen [Member]
|
Dec. 31, 2014
Westar Energy [Member]
First Mortgage Bond Series [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
|
Jan. 31, 2015
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument Three [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument Three [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument Three [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Aug. 01, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Jul. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument One [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument One [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument One [Member]
|
May 01, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8860 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Mar. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument 8860 [Member]
|
Dec. 31, 2014
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument Twenty-Nine [Member]
|
Dec. 31, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument Twenty-Nine [Member]
|
|
| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||
| Maximum Borrowing Capacity | $ 3,500,000,000 | |||||||||||||||||||||||||||||||
| Remaining Borrowing Capacity | 1,300,000,000 | 743,200,000 | ||||||||||||||||||||||||||||||
| Variable Rate Tax-Exempt Bonds | 121,900,000 | |||||||||||||||||||||||||||||||
| Long-term debt | 3,226,940,000 | 3,224,440,000 | 194,204,000 | 221,682,000 | 875,000,000 | 625,000,000 | 250,000,000 | 2,180,000,000 | 2,250,000,000 | 125,000,000 | 125,000,000 | 250,000,000 | 250,000,000 | 250,000,000 | 0 | 250,000,000 | 180,000,000 | 430,000,000 | 250,000,000 | 250,000,000 | 550,000,000 | 550,000,000 | ||||||||||
| Stated interest percentage | 5.60% | 6.00% | 4.625% | 4.10% | ||||||||||||||||||||||||||||
| Repayments of Long-term Debt | (427,500,000) | (100,000,000) | (220,563,000) | (27,479,000) | (25,942,000) | (28,114,000) | (100,000,000) | (177,500,000) | (125,000,000) | (250,000,000) | ||||||||||||||||||||||
| Interest expense on long-term debt | $ 158,800,000 | $ 154,900,000 | $ 145,600,000 | $ 11,400,000 | $ 13,000,000 | $ 15,100,000 | ||||||||||||||||||||||||||
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Aggregate amount of interest paid or due on all long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. No definition available.
|
| X | ||||||||||
|
- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Maximum Borrowing Capicity No definition available.
|
| X | ||||||||||
|
- Definition
Remaining Borrowing Capacity No definition available.
|
|
Taxes (Components of Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Current income taxes: | |||
| Federal | $ 416 | $ 135 | $ (691) |
| State | (597) | 279 | 579 |
| Deferred income taxes: | |||
| Federal | 124,923 | 102,030 | 102,960 |
| State | 29,657 | 24,443 | 26,300 |
| Investment tax credit amortization | (3,129) | (3,166) | (3,012) |
| Income tax expense | $ 151,270 | $ 123,721 | $ 126,136 |
| X | ||||||||||
|
- Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Taxes (Deferred Tax Assets and Liabilities in Balance Sheet) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Other current liabilities (assets) | $ (29,636) | $ (37,954) |
| Deferred Tax Liabilities, Net | $ 1,445,851 | $ 1,325,194 |
| X | ||||||||||
|
- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Income Tax Contingency [Line Items] | ||||||||||||
| Deferred Tax Liabilities, Net, Noncurrent | $ 1,475,487,000 | $ 1,363,148,000 | ||||||||||
| Deferred Tax Liabilities, Net | 1,445,851,000 | 1,325,194,000 | ||||||||||
| Deferred Tax Assets, Net, Current | 29,636,000 | 37,954,000 | ||||||||||
| Deferred tax assets: | ||||||||||||
| Business tax credit carryforward | 257,827,000 | [1] | 212,635,000 | [1] | ||||||||
| Deferred employee benefit costs | 158,102,000 | 85,720,000 | ||||||||||
| Net operating loss carryforward | 179,285,000 | [2] | 108,885,000 | [2] | ||||||||
| Deferred state income taxes | 66,557,000 | 57,243,000 | ||||||||||
| Deferred regulatory gain on sale-leaseback | 35,706,000 | 38,124,000 | ||||||||||
| Alternative minimum tax carryforward | 24,114,000 | [3] | 35,666,000 | [3] | ||||||||
| Deferred compensation | 29,315,000 | 30,022,000 | ||||||||||
| Accrued liabilities | 23,048,000 | 17,396,000 | ||||||||||
| Disallowed costs | 10,829,000 | 11,453,000 | ||||||||||
| Deferred Tax Assets, Dismantling Costs | 9,064,000 | 8,110,000 | ||||||||||
| Capital loss carryforward | 1,981,000 | 3,447,000 | ||||||||||
| Other | 27,689,000 | 20,058,000 | ||||||||||
| Total gross deferred tax assets | 823,517,000 | 628,759,000 | ||||||||||
| Less: Valuation allowance | 1,981,000 | [4] | 3,504,000 | [4] | ||||||||
| Deferred tax assets | 821,536,000 | 625,255,000 | ||||||||||
| Deferred tax liabilities: | ||||||||||||
| Accelerated depreciation | 1,664,367,000 | 1,390,669,000 | ||||||||||
| Deferred employee benefit costs | 153,984,000 | 163,742,000 | ||||||||||
| Acquisition premium | 163,894,000 | 171,907,000 | ||||||||||
| Amounts due from customers for future income taxes, net | 158,102,000 | 85,720,000 | ||||||||||
| Deferred state income taxes | 59,170,000 | 51,504,000 | ||||||||||
| Pension expense tracker | 15,713,000 | 21,165,000 | ||||||||||
| Debt reacquisition costs | 20,102,000 | 19,985,000 | ||||||||||
| Storm costs | 14,187,000 | 21,230,000 | ||||||||||
| Other | 17,868,000 | 24,527,000 | ||||||||||
| Total deferred tax liabilities | 2,267,387,000 | 1,950,449,000 | ||||||||||
| Net deferred tax liabilities | 1,445,851,000 | 1,325,194,000 | ||||||||||
| Capital loss carryforwards | 5,000,000 | |||||||||||
|
Deferred Tax Asset, Capital Loss [Member]
|
||||||||||||
| Deferred tax assets: | ||||||||||||
| Less: Valuation allowance | 2,000,000 | |||||||||||
|
Internal Revenue Service (IRS) [Member]
|
||||||||||||
| Deferred tax assets: | ||||||||||||
| Business tax credit carryforward | 73,500,000 | |||||||||||
| Deferred tax liabilities: | ||||||||||||
| Operating Loss Carryforwards | 452,800,000 | |||||||||||
|
State and Local Jurisdiction [Member]
|
||||||||||||
| Deferred tax assets: | ||||||||||||
| Business tax credit carryforward | $ 184,300,000 | |||||||||||
|
||||||||||||
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from a gain reported for tax purposes on sale and leaseback transactions in accordance with enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences from deferred financing costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Capital Loss Carryforwards No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Assets, Deferred State Income Taxes No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Assets, Disallowed Costs No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Assets, Dismantling Costs No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, Acquisition Premium No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, Amounts Due From Customers for Future Income Taxes, Net No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, Employee Benefit Costs No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, Pension Expense Tracker No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, State Income Taxes No definition available.
|
| X | ||||||||||
|
- Definition
Deferred Tax Liabilities, Storm Costs No definition available.
|
|
Taxes (Effective Income Tax Reconciliation) (Details)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Effective Income Tax Rate | |||
| Statutory federal income tax rate | 35.00% | 35.00% | 35.00% |
| Corporate-owned life insurance policies | (4.00%) | (5.40%) | (4.90%) |
| State income taxes | 4.00% | 3.80% | 4.30% |
| Production tax credits | (2.10%) | (2.30%) | (2.40%) |
| Accelerated depreciation flow through and amortization | 2.00% | 2.20% | 1.40% |
| AFUDC equity | (1.30%) | (1.20%) | (1.00%) |
| Amortization of federal investment tax credits | (0.70%) | (0.70%) | (0.70%) |
| Capital loss utilization | (0.30%) | (1.10%) | (0.30%) |
| Liability for unrecognized income tax benefits | (0.20%) | 0.10% | 0.20% |
| Other | (0.50%) | (1.30%) | (0.70%) |
| Effective income tax rate | 31.90% | 29.10% | 30.90% |
| X | ||||||||||
|
- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to depreciation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Effective Income Tax Rate Reconciliation, AFUDC Equity No definition available.
|
| X | ||||||||||
|
- Definition
Effective Income Tax Rate Reconciliation, Capital Loss Utilization No definition available.
|
| X | ||||||||||
|
- Definition
Effective Income Tax Rate Reconciliation, Liability for Unrecognized Income Tax Benefits No definition available.
|
|
Taxes (Unrecognized Tax Benefits) (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Unrecognized income tax benefits at January 1 | $ 1,703,000 | $ 1,219,000 | $ 2,483,000 |
| Additions based on tax positions related to the current year | 872,000 | 224,000 | 373,000 |
| Additions for tax positions of prior years | 813,000 | 325,000 | 0 |
| Reductions for tax positions of prior years | (200,000) | (65,000) | (1,637,000) |
| Settlements | 0 | 0 | 0 |
| Unrecognized income tax benefits at December 31 | 3,188,000 | 1,703,000 | 1,219,000 |
| The amounts of unrecognized income tax benefits that, if recognized, would favorably impact our effective income tax rate | 3,200,000 | 2,400,000 | 2,000,000 |
| Accrued interest related to unrecognized income tax benefits | 0 | 200,000 | |
| Penalties accrued | 0 | 0 | |
| Taxes other than income taxes | $ 1,500,000 | $ 1,500,000 | |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of interest expense accrued for an underpayment of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount recorded for probable assessments of taxes other than income taxes. No definition available.
|
|
Employee Benefit Plans (Funded Status) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Total Trading Securities, Assets | $ 35,497 | [1] | $ 34,926 | ||||||
|
Pension Benefits [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Benefit obligation, beginning of year | 823,780 | [2] | 928,708 | ||||||
| Service cost | 16,218 | 21,420 | 19,556 | ||||||
| Interest cost | 41,600 | 38,520 | 39,576 | ||||||
| Plan participants’ contributions | 0 | 0 | |||||||
| Defined Benefit Plan, Benefits Paid | 39,225 | 36,529 | |||||||
| Actuarial losses (gains) | 188,272 | (128,339) | |||||||
| Benefit obligation, end of year | 1,030,645 | [2] | 823,780 | [2] | 928,708 | ||||
| Change in Plan Assets: | |||||||||
| Fair value of plan assets, beginning of year | 609,817 | 547,931 | |||||||
| Actual return on plan assets | 61,291 | 68,151 | |||||||
| Employer contributions | 26,400 | 27,500 | |||||||
| Plan participants’ contributions | 0 | 0 | |||||||
| Benefits paid | 36,367 | 33,765 | |||||||
| Fair value of plan assets, end of year | 661,141 | 609,817 | 547,931 | ||||||
| Funded status, end of year | (369,504) | (213,963) | |||||||
| Amounts Recognized in the Balance Sheets Consist of: | |||||||||
| Current liability | (2,716) | (2,740) | |||||||
| Noncurrent liability | (366,788) | (211,223) | |||||||
| Net amount recognized | (369,504) | (213,963) | |||||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||||
| Net actuarial loss | 329,572 | 186,365 | |||||||
| Prior service cost | 2,867 | 3,393 | |||||||
| Transition obligation | 0 | 0 | |||||||
| Net amount recognized | 332,439 | 189,758 | |||||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Benefit obligation, beginning of year | 133,061 | [2] | 152,564 | ||||||
| Service cost | 1,381 | 2,028 | 2,057 | ||||||
| Interest cost | 6,351 | 6,007 | 6,298 | ||||||
| Plan participants’ contributions | 4,232 | 2,961 | |||||||
| Defined Benefit Plan, Benefits Paid | 12,184 | 10,968 | |||||||
| Actuarial losses (gains) | 16,509 | (19,531) | |||||||
| Benefit obligation, end of year | 141,516 | [2] | 133,061 | [2] | 152,564 | ||||
| Change in Plan Assets: | |||||||||
| Fair value of plan assets, beginning of year | 121,766 | 106,793 | |||||||
| Actual return on plan assets | 7,189 | 17,361 | |||||||
| Employer contributions | 0 | 5,318 | |||||||
| Plan participants’ contributions | (4,074) | (2,830) | |||||||
| Benefits paid | 11,680 | 10,536 | |||||||
| Fair value of plan assets, end of year | 121,349 | 121,766 | 106,793 | ||||||
| Funded status, end of year | (20,167) | (11,295) | |||||||
| Amounts Recognized in the Balance Sheets Consist of: | |||||||||
| Current liability | (246) | (242) | |||||||
| Noncurrent liability | (19,921) | (11,053) | |||||||
| Net amount recognized | (20,167) | (11,295) | |||||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||||
| Net actuarial loss | (2,253) | (18,890) | |||||||
| Prior service cost | 3,585 | 13,942 | |||||||
| Transition obligation | 0 | 0 | |||||||
| Net amount recognized | 1,332 | (4,948) | |||||||
|
Supplemental Employee Retirement Plans, Defined Benefit [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Benefit obligation, end of year | 29,800 | 27,000 | |||||||
|
Discount Rate [Member] | Pension Benefits [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Actuarial losses (gains) | 123,500 | ||||||||
|
Discount Rate [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Actuarial losses (gains) | 11,200 | ||||||||
|
Mortality [Member] | Pension Benefits [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Actuarial losses (gains) | 58,600 | ||||||||
|
Mortality [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||||
| Change in Benefit Obligation: | |||||||||
| Actuarial losses (gains) | $ 5,900 | ||||||||
|
|||||||||
| X | ||||||||||
|
- Definition
The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Actuarial Net (Gains) Losses Recognized in Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amount Recognized in Regulatory Assets, Net Prior Service Cost (Credit) No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Regulatory Assets, Transition obligation No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Change In Plan Assets, Benefits Paid No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plans, Change in Plan Assets, Contributions from Plan Participants No definition available.
|
|
Employee Benefit Plans (Plans With a Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
|
Pension Benefits [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Projected benefit obligation | $ 1,030,645 | $ 823,780 |
| Fair value of plan assets | 661,141 | 609,817 |
| Accumulated benefit obligation | 914,800 | 732,150 |
| Fair value of plan assets | 661,141 | 609,817 |
| Discount rate | 4.17% | 5.07% |
| Compensation rate increase | 4.00% | 4.00% |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Accumulated benefit obligation | 141,516 | 133,061 |
| Fair value of plan assets | $ 121,349 | $ 121,766 |
| Discount rate | 4.10% | 4.88% |
| Compensation rate increase | 0.00% | 0.00% |
| X | ||||||||||
|
- Definition
The interest rate used to adjust for the time value of money for the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Net Periodic Costs And Other Changes Recognized in Regulatory Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
||||||
|
Pension Benefits [Member]
|
||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||
| Service cost | $ 16,218 | $ 21,420 | $ 19,556 | |||||
| Interest cost | 41,600 | 38,520 | 39,576 | |||||
| Expected return on plan assets | (36,438) | (33,405) | (32,283) | |||||
| Transition obligation, net | 0 | 0 | 0 | |||||
| Prior service costs | 526 | 601 | 612 | |||||
| Actuarial loss/(gain), net | 19,362 | 33,914 | 32,778 | |||||
| Net periodic cost before regulatory adjustment | 41,268 | 61,050 | 60,239 | |||||
| Regulatory adjustment | 15,479 | [1] | 3,693 | [1] | (6,523) | [1] | ||
| Net periodic cost | 56,747 | 64,743 | 53,716 | |||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||
| Current year actuarial (gain)/loss | 162,569 | (163,086) | 18,451 | |||||
| Amortization of actuarial (loss)/gain | (19,362) | (33,914) | (32,778) | |||||
| Current year prior service cost | 0 | 0 | 0 | |||||
| Amortization of prior service costs | (526) | (601) | (612) | |||||
| Amortization of transition obligation | 0 | 0 | 0 | |||||
| Total recognized in regulatory assets | 142,681 | (197,601) | (14,939) | |||||
| Total recognized in net periodic cost and regulatory assets | 199,428 | (132,858) | 38,777 | |||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||
| Discount rate | 5.07% | 4.13% | 4.50% | |||||
| Expected long-term return on plan assets | 6.50% | 6.50% | 6.50% | |||||
| Compensation rate increase | 4.00% | 4.00% | 4.00% | |||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||
| Service cost | 1,381 | 2,028 | 2,057 | |||||
| Interest cost | 6,351 | 6,007 | 6,298 | |||||
| Expected return on plan assets | (6,576) | (6,691) | (5,491) | |||||
| Transition obligation, net | 0 | 325 | 3,912 | |||||
| Prior service costs | 2,524 | 2,524 | 2,524 | |||||
| Actuarial loss/(gain), net | (742) | 1,125 | 1,503 | |||||
| Net periodic cost before regulatory adjustment | 2,938 | 5,318 | 10,803 | |||||
| Regulatory adjustment | 4,499 | [1] | 2,922 | [1] | 23 | [1] | ||
| Net periodic cost | 7,437 | 8,240 | 10,826 | |||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||
| Current year actuarial (gain)/loss | 15,896 | (30,201) | (4,239) | |||||
| Amortization of actuarial (loss)/gain | 742 | (1,125) | (1,503) | |||||
| Current year prior service cost | (7,834) | 0 | 0 | |||||
| Amortization of prior service costs | (2,524) | (2,525) | (2,524) | |||||
| Amortization of transition obligation | 0 | (325) | (3,912) | |||||
| Total recognized in regulatory assets | 6,280 | (34,176) | (12,178) | |||||
| Total recognized in net periodic cost and regulatory assets | $ 13,717 | $ (25,936) | $ (1,352) | |||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||
| Discount rate | 4.88% | 3.99% | 4.25% | |||||
| Expected long-term return on plan assets | 6.00% | 6.00% | 6.00% | |||||
| Compensation rate increase | 4.00% | 4.00% | 0.00% | |||||
|
||||||||
| X | ||||||||||
|
- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The interest rate used to adjust for the time value of money. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Amortization of Prior Service Cost (Credit) No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Amortization of Transition Obligations (Assets) No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Asset, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period No definition available.
|
| X | ||||||||||
|
- Definition
Chang in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period No definition available.
|
| X | ||||||||||
|
- Definition
Changes in Regulatory Assets, Reclassification, Pension and Other Postretirement Benefit Plans, Amortization of Gain (Loss) No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Net Periodic Benefit Cost and Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period prior to regulatory adjustment. No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan Regulatory Adjustment No definition available.
|
|
Employee Benefit Plans (Estimated Amounts From Regulatory Assets Into Net Periodic Cost) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
|---|---|
|
Pension Plans, Defined Benefit [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Estimated Future Change in Regulatory Assets, Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost | $ 32,131 |
| Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost | (520) |
| Total | 32,651 |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| Estimated Future Change in Regulatory Assets, Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost | 379 |
| Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost | (455) |
| Total | $ 834 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net (Gain) Loss Recognized in Net Periodic Benefit Cost No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans No definition available.
|
|
Employee Benefit Plans (Assumed Annual Health Care Cost Growth Rates) (Details)
|
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year | 1.00% | 7.50% |
| Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 5.00% | |
| Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate | 2019 | |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The ultimate trend rate for health care costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (One Percentage Change In Assumed Health Care Cost Growth Rates Effects) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year | 1.00% | 7.50% |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | $ 134 | |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components | (120) | |
| Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation | 0 | |
| Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation | $ 0 | |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Fair Value of Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|---|
|
Pension Plans, Defined Benefit [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | $ 661,141 | $ 609,817 | $ 547,931 |
|
Pension Plans, Defined Benefit [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 569,565 | 524,136 | |
|
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 91,576 | 85,681 | |
|
Pension Plans, Defined Benefit [Member] | Domestic Equity Securities [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 184,570 | 183,760 | |
|
Pension Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 160,574 | 161,272 | |
|
Pension Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 23,996 | 22,488 | |
|
Pension Plans, Defined Benefit [Member] | International Equity Securities [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 82,604 | 75,872 | |
|
Pension Plans, Defined Benefit [Member] | International Equity Securities [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | International Equity Securities [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 82,604 | 75,872 | |
|
Pension Plans, Defined Benefit [Member] | International Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Core Bonds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 224,740 | 191,506 | |
|
Pension Plans, Defined Benefit [Member] | Core Bonds [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Core Bonds [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 224,740 | 191,506 | |
|
Pension Plans, Defined Benefit [Member] | Core Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | High-Yield Bonds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 20,412 | 20,796 | |
|
Pension Plans, Defined Benefit [Member] | High-Yield Bonds [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | High-Yield Bonds [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 20,412 | 20,796 | |
|
Pension Plans, Defined Benefit [Member] | High-Yield Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Emerging Market Bonds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 14,685 | 13,113 | |
|
Pension Plans, Defined Benefit [Member] | Emerging Market Bonds [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Emerging Market Bonds [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 14,685 | 13,113 | |
|
Pension Plans, Defined Benefit [Member] | Emerging Market Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Combination Debt Equity Fund Member
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 61,632 | 58,336 | |
|
Pension Plans, Defined Benefit [Member] | Combination Debt Equity Fund Member | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Combination Debt Equity Fund Member | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 61,632 | 58,336 | |
|
Pension Plans, Defined Benefit [Member] | Combination Debt Equity Fund Member | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Real Estate [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 26,439 | 24,022 | |
|
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 26,439 | 24,022 | |
|
Pension Plans, Defined Benefit [Member] | Alternative Investments [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 41,141 | 39,171 | |
|
Pension Plans, Defined Benefit [Member] | Alternative Investments [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Alternative Investments [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 41,141 | 39,171 | |
|
Pension Plans, Defined Benefit [Member] | Cash Equivalents [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 4,918 | 3,241 | |
|
Pension Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Pension Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 4,918 | 3,241 | |
|
Pension Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 121,349 | 121,766 | 106,793 |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 121,349 | 121,766 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Domestic Equity Securities [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 63,600 | 64,080 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 63,600 | 64,080 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | International Equity Securities [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 14,783 | 16,018 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | International Equity Securities [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | International Equity Securities [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 14,783 | 16,018 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | International Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Core Bonds [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 42,390 | 41,092 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Core Bonds [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Core Bonds [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 42,390 | 41,092 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Core Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash Equivalents [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 576 | 576 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Level 1 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Level 2 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | 576 | 576 | |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Changes in Level 3 Plan Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 32,565 | $ 30,003 | $ 12,764 |
|
Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 91,576 | 85,681 | 84,955 |
| Defined Benefit Plan, Actual Return on Plan Assets Still Held | 4,446 | 9,088 | |
| Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 1,394 | 826 | |
| Purchases, issuances and settlements, net | 55 | (9,188) | |
|
Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 23,996 | 22,488 | 18,493 |
| Defined Benefit Plan, Actual Return on Plan Assets Still Held | (154) | 3,845 | |
| Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 1,365 | 0 | |
| Purchases, issuances and settlements, net | 297 | 150 | |
|
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 26,439 | 24,022 | 20,927 |
| Defined Benefit Plan, Actual Return on Plan Assets Still Held | 2,630 | 3,307 | |
| Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | (29) | 0 | |
| Purchases, issuances and settlements, net | (242) | (212) | |
|
Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 41,141 | 39,171 | 45,535 |
| Defined Benefit Plan, Actual Return on Plan Assets Still Held | 1,970 | 1,936 | |
| Defined Benefit Plan, Actual Return on Plan Assets Sold During Period | 0 | 826 | |
| Purchases, issuances and settlements, net | $ 0 | $ (9,126) | |
| X | ||||||||||
|
- Definition
Actual return on plan assets, separately identifying the amount related to assets sold during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Expected Cash Flows Related To Pension and Post-Retirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2014
|
|
|
Plan Trust [Member] | Pension Benefits [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| 2014 | $ 42.0 |
| 2014 | (35.1) |
| 2015 | (37.3) |
| 2016 | (39.5) |
| 2017 | (41.9) |
| 2018 | (44.2) |
| 2019 - 2022 | (257.8) |
|
Plan Trust [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| 2014 | 0 |
| 2014 | (8.2) |
| 2015 | (8.3) |
| 2016 | (8.4) |
| 2017 | (8.6) |
| 2018 | (8.7) |
| 2019 - 2022 | (43.5) |
|
Company Assets [Member] | Pension Benefits [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| 2014 | (2.8) |
| 2015 | (2.8) |
| 2016 | (2.8) |
| 2017 | (2.7) |
| 2018 | (2.7) |
| 2019 - 2022 | (13.0) |
|
Company Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Defined Benefit Plan Disclosure [Line Items] | |
| 2014 | (0.2) |
| 2015 | (0.2) |
| 2016 | (0.2) |
| 2017 | (0.2) |
| 2018 | (0.2) |
| 2019 - 2022 | $ (1.0) |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Compensation expense and income tax benefits related to stock-based compensation arrangements included in net income) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Allocated Share-based Compensation Expense | $ 7,193 | $ 8,121 | $ 7,203 |
| Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 2,845 | $ 3,212 | $ 2,849 |
| X | ||||||||||
|
- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (RSU activity for awards) (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
|
RSU Awards With Only Service Requirements [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $ 3,900,000 | $ 3,700,000 | $ 3,700,000 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | |||
| Nonvested balance, beginning of year | 352,500 | 351,100 | 368,500 |
| Granted | 131,500 | 139,600 | 131,000 |
| Vested | (118,200) | (125,500) | (127,800) |
| Forfeited | (23,600) | (12,700) | (20,600) |
| Nonvested balance, end of year | 342,200 | 352,500 | 351,100 |
| Weighted Average Grant Date Fair Value, beginning of year | $ 28.38 | $ 25.47 | $ 23.83 |
| Grants in Period, Weighted Average Grant Date Fair Value | $ 34.53 | $ 31.06 | $ 27.82 |
| Vested in Period, Weighted Average Grant Date Fair Value | $ 26.19 | $ 23.22 | $ 23.34 |
| Forfeited in Period, Weighted Average Grant Date Fair Value | $ 30.00 | $ 28.35 | $ 24.40 |
| Weighted Average Grant Date Fair Value, end of year | $ 31.38 | $ 28.38 | $ 25.47 |
|
RSU Awards With Performance Measures [Member]
|
|||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $ 500,000 | $ 2,300,000 | $ 3,600,000.0 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward] | |||
| Nonvested balance, beginning of year | 350,100 | 340,100 | 324,200 |
| Granted | 126,100 | 134,400 | 122,300 |
| Vested | (108,200) | (112,500) | (88,200) |
| Forfeited | (22,900) | (11,900) | (18,200) |
| Nonvested balance, end of year | 345,100 | 350,100 | 340,100 |
| Weighted Average Grant Date Fair Value, beginning of year | $ 30.35 | $ 29.20 | $ 28.31 |
| Grants in Period, Weighted Average Grant Date Fair Value | $ 35.97 | $ 31.54 | $ 28.84 |
| Vested in Period, Weighted Average Grant Date Fair Value | $ 30.56 | $ 28.29 | $ 25.46 |
| Forfeited in Period, Weighted Average Grant Date Fair Value | $ 30.70 | $ 30.45 | $ 29.00 |
| Weighted Average Grant Date Fair Value, end of year | $ 32.31 | $ 30.35 | $ 29.20 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Employee Benefit Plans (Textual) (Details) (USD $)
|
12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2014
Level 2 [Member]
|
Dec. 31, 2013
Level 2 [Member]
|
Dec. 31, 2014
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
Dec. 31, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Supplemental Employee Retirement Plans, Defined Benefit [Member]
|
Dec. 31, 2013
Supplemental Employee Retirement Plans, Defined Benefit [Member]
|
Dec. 31, 2014
KGE [Member]
|
Dec. 31, 2014
Debt Securities [Member]
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Debt Securities [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Equity Securities [Member]
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Equity Securities [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Alternative Investments [Member]
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Other Investments [Member]
Pension Plans, Defined Benefit [Member]
|
Dec. 31, 2014
Long Term Incentive and Share Award [Member]
|
May 19, 2011
Long Term Incentive and Share Award [Member]
|
Dec. 31, 2014
Long Term Incentive and Share Award Plan Executive Stock For Compensation Program [Member]
|
Dec. 31, 2013
Long Term Incentive and Share Award Plan Executive Stock For Compensation Program [Member]
|
Dec. 31, 2012
Long Term Incentive and Share Award Plan Executive Stock For Compensation Program [Member]
|
Dec. 31, 2014
RSU Awards With Performance Measures [Member]
|
Dec. 31, 2013
RSU Awards With Performance Measures [Member]
|
Dec. 31, 2012
RSU Awards With Performance Measures [Member]
|
Dec. 31, 2014
RSU Awards With Only Service Requirements [Member]
|
Dec. 31, 2013
RSU Awards With Only Service Requirements [Member]
|
Dec. 31, 2012
RSU Awards With Only Service Requirements [Member]
|
|||||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Subsidiary Interest in Defined Benefit Plans | 47.00% | ||||||||||||||||||||||||||||||||||||||||
| Defined Benefit Plan, Benefits Paid | $ 39,225,000 | $ 36,529,000 | $ 12,184,000 | $ 10,968,000 | |||||||||||||||||||||||||||||||||||||
| Benefit obligation for certain retirement benefits | 1,030,645,000 | [1] | 823,780,000 | [1] | 928,708,000 | 141,516,000 | [1] | 133,061,000 | [1] | 152,564,000 | 29,800,000 | 27,000,000 | |||||||||||||||||||||||||||||
| Total Trading Securities, Assets | 35,497,000 | [2] | 34,926,000 | 35,329,000 | [2] | 34,760,000 | |||||||||||||||||||||||||||||||||||
| Defined Benefit Plan Target Allocation Percentage Of Assets Of Any One Industry | 25.00% | ||||||||||||||||||||||||||||||||||||||||
| Target Defined Benefit Plan Asset Allocations | 39.00% | 35.00% | 39.00% | 65.00% | 12.00% | 10.00% | |||||||||||||||||||||||||||||||||||
| US Government Securities, at Carrying Value | 59,000,000 | ||||||||||||||||||||||||||||||||||||||||
| 401k Savings Plan Matching Contributions | 7,000,000 | 6,900,000 | 7,100,000 | ||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 8,250,000 | ||||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Awarded | 5,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Percentage of RSU Award, Minimum | 0.00% | ||||||||||||||||||||||||||||||||||||||||
| Percentage of RSU Award, Maximum | 200.00% | ||||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum | 15.20% | 15.00% | |||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum | 23.30% | 23.50% | |||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum | 0.30% | 0.30% | |||||||||||||||||||||||||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | 3,800,000 | 4,000,000 | 4,400,000 | 4,400,000 | |||||||||||||||||||||||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 1 year 8 months | 1 year 11 months | |||||||||||||||||||||||||||||||||||||||
| Share-based Compensation Award Fair Value, Vested During Period | $ 500,000 | $ 2,300,000 | $ 3,600,000.0 | $ 3,900,000 | $ 3,700,000 | $ 3,700,000 | |||||||||||||||||||||||||||||||||||
| Common Stock Dividends, Shares | 403 | 551 | 666 | ||||||||||||||||||||||||||||||||||||||
| Common stock, shares issued | 131,687,454 | 128,254,229 | 1,944 | 3,456 | 1,461 | ||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
|
- Definition
Number of shares of common stock issued as dividends during the period. Excludes stock splits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the cost recognized during the period for defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.
|
| X | ||||||||||
|
- Definition
The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.
|
| X | ||||||||||
|
- Definition
The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
|
| X | ||||||||||
|
- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan Asset Allocation Restrictions, Maximum Percentage Of Assets Invested In Any One Industry No definition available.
|
| X | ||||||||||
|
- Definition
Pension Plan Assets Invested Directly In Long Term U S Treasury Securities No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of RSU Award, Maximum No definition available.
|
| X | ||||||||||
|
- Definition
Percentage of RSU Award, Minimum No definition available.
|
| X | ||||||||||
|
- Definition
Share-based Compensation Arrangement By Share-based Payment Award, Shares Awarded No definition available.
|
| X | ||||||||||
|
- Definition
Subsidiary's interest in defined benefit plans. No definition available.
|
|
Wolf Creek Employee Benefit Plans (Funded Status) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|||||
|
Wolf Creek [Member]
|
|||||||
| Change in Plan Assets: | |||||||
| Fair value of plan assets, end of year | $ 124,660 | $ 114,734 | |||||
|
Pension Benefits [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Benefit obligation, beginning of year | 823,780 | [1] | 928,708 | ||||
| Service cost | 16,218 | 21,420 | 19,556 | ||||
| Interest cost | 41,600 | 38,520 | 39,576 | ||||
| Plan participants’ contributions | 0 | 0 | |||||
| Defined Benefit Plan, Benefits Paid | (39,225) | (36,529) | |||||
| Actuarial losses (gains) | 188,272 | (128,339) | |||||
| Amendments | 0 | 0 | |||||
| Benefit obligation, end of year | 1,030,645 | [1] | 823,780 | [1] | 928,708 | ||
| Change in Plan Assets: | |||||||
| Fair value of plan assets, beginning of year | 609,817 | 547,931 | |||||
| Actual return on plan assets | 61,291 | 68,151 | |||||
| Employer contributions | 26,400 | 27,500 | |||||
| Plan participants' contribution | 0 | 0 | |||||
| Benefits paid | 36,367 | 33,765 | |||||
| Fair value of plan assets, end of year | 661,141 | 609,817 | 547,931 | ||||
| Funded status, end of year | (369,504) | (213,963) | |||||
| Amounts Recognized in the Balance Sheet Consist of: | |||||||
| Current liability | (2,716) | (2,740) | |||||
| Noncurrent liability | (366,788) | (211,223) | |||||
| Net amount recognized | (369,504) | (213,963) | |||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||
| Net actuarial loss | 329,572 | 186,365 | |||||
| Prior service cost | 2,867 | 3,393 | |||||
| Transition obligation | 0 | 0 | |||||
| Net amount recognized | 332,439 | 189,758 | |||||
|
Pension Benefits [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Benefit obligation, beginning of year | 162,820 | 176,891 | |||||
| Service cost | 5,695 | 6,835 | 6,062 | ||||
| Interest cost | 8,469 | 7,562 | 7,537 | ||||
| Plan participants’ contributions | 0 | 0 | |||||
| Defined Benefit Plan, Benefits Paid | (5,039) | (4,349) | |||||
| Actuarial losses (gains) | 38,375 | (24,119) | |||||
| Benefit obligation, end of year | 210,320 | 162,820 | 176,891 | ||||
| Change in Plan Assets: | |||||||
| Fair value of plan assets, beginning of year | 114,734 | 98,051 | |||||
| Actual return on plan assets | 7,626 | 13,166 | |||||
| Employer contributions | 7,089 | 7,624 | |||||
| Plan participants' contribution | 0 | 0 | |||||
| Benefits paid | (4,789) | (4,107) | |||||
| Fair value of plan assets, end of year | 124,660 | 114,734 | 98,051 | ||||
| Funded status, end of year | (85,660) | (48,086) | |||||
| Amounts Recognized in the Balance Sheet Consist of: | |||||||
| Current liability | (247) | (237) | |||||
| Noncurrent liability | (85,413) | (47,849) | |||||
| Net amount recognized | (85,660) | (48,086) | |||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||
| Net actuarial loss | 65,049 | 29,203 | |||||
| Prior service cost | 559 | 617 | |||||
| Net amount recognized | 65,608 | 29,820 | |||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Benefit obligation, beginning of year | 133,061 | [1] | 152,564 | ||||
| Service cost | 1,381 | 2,028 | 2,057 | ||||
| Interest cost | 6,351 | 6,007 | 6,298 | ||||
| Plan participants’ contributions | 4,232 | 2,961 | |||||
| Defined Benefit Plan, Benefits Paid | (12,184) | (10,968) | |||||
| Actuarial losses (gains) | 16,509 | (19,531) | |||||
| Amendments | (7,834) | 0 | |||||
| Benefit obligation, end of year | 141,516 | [1] | 133,061 | [1] | 152,564 | ||
| Change in Plan Assets: | |||||||
| Fair value of plan assets, beginning of year | 121,766 | 106,793 | |||||
| Actual return on plan assets | 7,189 | 17,361 | |||||
| Employer contributions | 0 | 5,318 | |||||
| Plan participants' contribution | 4,074 | 2,830 | |||||
| Benefits paid | 11,680 | 10,536 | |||||
| Fair value of plan assets, end of year | 121,349 | 121,766 | 106,793 | ||||
| Funded status, end of year | (20,167) | (11,295) | |||||
| Amounts Recognized in the Balance Sheet Consist of: | |||||||
| Current liability | (246) | (242) | |||||
| Noncurrent liability | (19,921) | (11,053) | |||||
| Net amount recognized | (20,167) | (11,295) | |||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||
| Net actuarial loss | (2,253) | (18,890) | |||||
| Prior service cost | 3,585 | 13,942 | |||||
| Transition obligation | 0 | 0 | |||||
| Net amount recognized | 1,332 | (4,948) | |||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Benefit obligation, beginning of year | 10,010 | 11,020 | |||||
| Service cost | 173 | 206 | 191 | ||||
| Interest cost | 464 | 413 | 411 | ||||
| Plan participants’ contributions | 766 | 696 | |||||
| Defined Benefit Plan, Benefits Paid | (1,292) | (1,022) | |||||
| Actuarial losses (gains) | (1,881) | (1,303) | |||||
| Benefit obligation, end of year | 8,240 | 10,010 | 11,020 | ||||
| Change in Plan Assets: | |||||||
| Fair value of plan assets, beginning of year | 17 | 13 | |||||
| Actual return on plan assets | 0 | 0 | |||||
| Employer contributions | 515 | 330 | |||||
| Plan participants' contribution | 766 | 696 | |||||
| Benefits paid | (1,292) | (1,022) | |||||
| Fair value of plan assets, end of year | 6 | 17 | 13 | ||||
| Funded status, end of year | (8,234) | (9,993) | |||||
| Amounts Recognized in the Balance Sheet Consist of: | |||||||
| Current liability | (575) | (614) | |||||
| Noncurrent liability | (7,659) | (9,379) | |||||
| Net amount recognized | (8,234) | (9,993) | |||||
| Amounts Recognized in Regulatory Assets Consist of: | |||||||
| Net actuarial loss | 29 | 2,076 | |||||
| Prior service cost | 0 | 0 | |||||
| Net amount recognized | 29 | 2,076 | |||||
|
Discount Rate [Member] | Pension Benefits [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 123,500 | ||||||
|
Discount Rate [Member] | Pension Benefits [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 26,900 | ||||||
|
Discount Rate [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 11,200 | ||||||
|
Discount Rate [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 600 | ||||||
|
Mortality [Member] | Pension Benefits [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 58,600 | ||||||
|
Mortality [Member] | Pension Benefits [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 11,300 | ||||||
|
Mortality [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | 5,900 | ||||||
|
Mortality [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|||||||
| Change in Benefit Obligation: | |||||||
| Actuarial losses (gains) | $ 200 | ||||||
|
|||||||
| X | ||||||||||
|
- Definition
The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Actuarial Net (Gains) Losses Recognized in Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amount Recognized in Regulatory Assets, Net Prior Service Cost (Credit) No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Regulatory Assets, Transition obligation No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Change In Plan Assets, Benefits Paid No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plans, Change in Plan Assets, Contributions from Plan Participants No definition available.
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Plans With a Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
|
Pension Plans, Defined Benefit [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Projected benefit obligation | $ 1,030,645 | $ 823,780 |
| Fair value of plan assets | 661,141 | 609,817 |
| Accumulated benefit obligation | 914,800 | 732,150 |
| Fair value of plan assets | 661,141 | 609,817 |
| Discount rate | 4.17% | 5.07% |
| Compensation rate increase | 4.00% | 4.00% |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Accumulated benefit obligation | 141,516 | 133,061 |
| Fair value of plan assets | 121,349 | 121,766 |
| Discount rate | 4.10% | 4.88% |
| Compensation rate increase | 0.00% | 0.00% |
|
Wolf Creek [Member] | Pension Plans, Defined Benefit [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Projected benefit obligation | 210,320 | 162,820 |
| Fair value of plan assets | 124,660 | 114,734 |
| Accumulated benefit obligation | 179,228 | 137,459 |
| Fair value of plan assets | 124,660 | 114,734 |
| Discount rate | 4.20% | 5.11% |
| Compensation rate increase | 4.00% | 4.00% |
|
Wolf Creek [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Accumulated benefit obligation | 8,240 | 10,010 |
| Fair value of plan assets | $ 6 | $ 16 |
| Discount rate | 3.89% | 4.70% |
| Compensation rate increase | 0.00% | 0.00% |
| X | ||||||||||
|
- Definition
The interest rate used to adjust for the time value of money for the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Net Periodic Costs And Other Changes Recognized in Regulatory Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
||||||||
|
Pension Benefits [Member]
|
||||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||||
| Service cost | $ 16,218 | $ 21,420 | $ 19,556 | |||||||
| Interest cost | 41,600 | 38,520 | 39,576 | |||||||
| Expected return on plan assets | (36,438) | (33,405) | (32,283) | |||||||
| Transition obligation, net | 0 | 0 | 0 | |||||||
| Prior service costs | 526 | 601 | 612 | |||||||
| Actuarial loss, net | 19,362 | 33,914 | 32,778 | |||||||
| Net periodic cost before regulatory adjustment | 41,268 | 61,050 | 60,239 | |||||||
| Regulatory adjustment | 15,479 | [1] | 3,693 | [1] | (6,523) | [1] | ||||
| Net periodic cost | 56,747 | 64,743 | 53,716 | |||||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||||
| Current year actuarial (gain)/loss | 162,569 | (163,086) | 18,451 | |||||||
| Amortization of actuarial loss | (19,362) | (33,914) | (32,778) | |||||||
| Current year prior service cost | 0 | 0 | 0 | |||||||
| Amortization of prior service costs | (526) | (601) | (612) | |||||||
| Amortization of transition obligation | 0 | 0 | 0 | |||||||
| Total recognized in regulatory assets | 142,681 | (197,601) | (14,939) | |||||||
| Total recognized in net periodic cost and regulatory assets | 199,428 | (132,858) | 38,777 | |||||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||||
| Discount rate | 5.07% | 4.13% | 4.50% | |||||||
| Expected long-term return on plan assets | 6.50% | 6.50% | 6.50% | |||||||
| Compensation rate increase | 4.00% | 4.00% | 4.00% | |||||||
|
Pension Benefits [Member] | Wolf Creek [Member]
|
||||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||||
| Service cost | 5,695 | 6,835 | 6,062 | |||||||
| Interest cost | 8,469 | 7,562 | 7,537 | |||||||
| Expected return on plan assets | (8,084) | (7,373) | (6,577) | |||||||
| Transition obligation, net | 0 | 0 | 0 | |||||||
| Prior service costs | 58 | 58 | 6 | |||||||
| Actuarial loss, net | 2,987 | 5,421 | 5,366 | |||||||
| Net periodic cost before regulatory adjustment | 9,125 | 12,503 | 12,394 | |||||||
| Regulatory adjustment | 2,328 | [2] | (641) | [2] | (1,776) | [2] | ||||
| Net periodic cost | 11,453 | 11,862 | 10,618 | |||||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||||
| Current year actuarial (gain)/loss | 38,833 | (29,911) | 4,629 | |||||||
| Amortization of actuarial loss | (2,987) | (5,421) | (5,366) | |||||||
| Current year prior service cost | 0 | 0 | 650 | |||||||
| Amortization of prior service costs | (58) | (58) | (6) | |||||||
| Amortization of transition obligation | 0 | 0 | 0 | |||||||
| Total recognized in regulatory assets | 35,788 | (35,390) | (93) | |||||||
| Total recognized in net periodic cost and regulatory assets | 47,241 | (23,528) | 10,525 | |||||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||||
| Discount rate | 5.11% | 4.16% | 4.55% | |||||||
| Expected long-term return on plan assets | 7.50% | 7.50% | 7.50% | |||||||
| Compensation rate increase | 4.00% | 4.00% | 4.00% | |||||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
||||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||||
| Service cost | 1,381 | 2,028 | 2,057 | |||||||
| Interest cost | 6,351 | 6,007 | 6,298 | |||||||
| Expected return on plan assets | (6,576) | (6,691) | (5,491) | |||||||
| Transition obligation, net | 0 | 325 | 3,912 | |||||||
| Prior service costs | 2,524 | 2,524 | 2,524 | |||||||
| Actuarial loss, net | (742) | 1,125 | 1,503 | |||||||
| Net periodic cost before regulatory adjustment | 2,938 | 5,318 | 10,803 | |||||||
| Regulatory adjustment | 4,499 | [1] | 2,922 | [1] | 23 | [1] | ||||
| Net periodic cost | 7,437 | 8,240 | 10,826 | |||||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||||
| Current year actuarial (gain)/loss | 15,896 | (30,201) | (4,239) | |||||||
| Amortization of actuarial loss | 742 | (1,125) | (1,503) | |||||||
| Current year prior service cost | (7,834) | 0 | 0 | |||||||
| Amortization of prior service costs | (2,524) | (2,525) | (2,524) | |||||||
| Amortization of transition obligation | 0 | (325) | (3,912) | |||||||
| Total recognized in regulatory assets | 6,280 | (34,176) | (12,178) | |||||||
| Total recognized in net periodic cost and regulatory assets | 13,717 | (25,936) | (1,352) | |||||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||||
| Discount rate | 4.88% | 3.99% | 4.25% | |||||||
| Expected long-term return on plan assets | 6.00% | 6.00% | 6.00% | |||||||
| Compensation rate increase | 4.00% | 4.00% | 0.00% | |||||||
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
||||||||||
| Components of Net Periodic Cost (Benefit): | ||||||||||
| Service cost | 173 | 206 | 191 | |||||||
| Interest cost | 464 | 413 | 411 | |||||||
| Expected return on plan assets | 0 | 0 | 0 | |||||||
| Transition obligation, net | 0 | 0 | 57 | |||||||
| Prior service costs | 0 | 0 | 0 | |||||||
| Actuarial loss, net | 165 | 265 | 234 | |||||||
| Net periodic cost before regulatory adjustment | 802 | 884 | 893 | |||||||
| Regulatory adjustment | 0 | [2] | 0 | [2] | 0 | [2] | ||||
| Net periodic cost | 802 | 884 | 893 | |||||||
| Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets: | ||||||||||
| Current year actuarial (gain)/loss | (1,881) | (1,303) | 669 | |||||||
| Amortization of actuarial loss | (165) | (265) | (234) | |||||||
| Current year prior service cost | 0 | 0 | 0 | |||||||
| Amortization of prior service costs | 0 | 0 | 0 | |||||||
| Amortization of transition obligation | 0 | 0 | (57) | |||||||
| Total recognized in regulatory assets | (2,046) | (1,568) | 378 | |||||||
| Total recognized in net periodic cost and regulatory assets | $ (1,244) | $ (684) | $ 1,271 | |||||||
| Weighted-Average Actuarial Assumptions used to Determine Net Periodic Cost: | ||||||||||
| Discount rate | 4.70% | 3.78% | 4.10% | |||||||
| Expected long-term return on plan assets | 0.00% | 0.00% | 0.00% | |||||||
| Compensation rate increase | 0.00% | 0.00% | 0.00% | |||||||
|
||||||||||
| X | ||||||||||
|
- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The interest rate used to adjust for the time value of money. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Expected rate of compensation increases (for pay-related plans). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Amortization of Prior Service Cost (Credit) No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Amortization of Transition Obligations (Assets) No definition available.
|
| X | ||||||||||
|
- Definition
Change in Regulatory Asset, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period No definition available.
|
| X | ||||||||||
|
- Definition
Chang in Regulatory Assets, Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period No definition available.
|
| X | ||||||||||
|
- Definition
Changes in Regulatory Assets, Reclassification, Pension and Other Postretirement Benefit Plans, Amortization of Gain (Loss) No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan, Amounts Recognized in Net Periodic Benefit Cost and Regulatory Assets No definition available.
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period prior to regulatory adjustment. No definition available.
|
| X | ||||||||||
|
- Definition
Defined Benefit Plan Regulatory Adjustment No definition available.
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Estimated Amounts From Regulatory Assets Into Net Periodic Cost) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
|---|---|
|
Pension Benefits [Member]
|
|
| Actuarial loss | $ (32,131) |
| Prior service cost | (520) |
| Total | 32,651 |
|
Pension Benefits [Member] | Wolf Creek [Member]
|
|
| Actuarial loss | (5,930) |
| Prior service cost | (57) |
| Total | 5,987 |
|
Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Actuarial loss | (379) |
| Prior service cost | (455) |
| Total | 834 |
|
Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|
| Actuarial loss | (2) |
| Prior service cost | 0 |
| Total | $ 2 |
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net (Gain) Loss Recognized in Net Periodic Benefit Cost No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Recognized in Net Periodic Benefit Cost No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Future Change in Regulatory Assets, Pension and Other Postretirement Benefit Plans No definition available.
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Assumed Annual Health Care Cost Growth Rates) (Details)
|
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Health care cost trend rate assumed for next year | 1.00% | 7.50% |
| Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00% | |
| Year that the rate reaches the ultimate trend rate | 2019 | |
|
Wolf Creek [Member]
|
||
| Health care cost trend rate assumed for next year | 7.00% | 7.50% |
| Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00% | 5.00% |
| Year that the rate reaches the ultimate trend rate | 2019 | 2019 |
| X | ||||||||||
|
- Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The ultimate trend rate for health care costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (One Percentage Change In Assumed Health Care Cost Growth Rates Effects) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year | 1.00% | 7.50% |
| Effect on total of service and interest cost from one-percentage-point increase | $ 134 | |
| Effect on total of service and interest cost from one-percentage-point decrease | (120) | |
| Effect on post-retirement benefit obligation from one-percentage-point increase | 0 | |
| Effect on post-retirement benefit obligation from one-percentage-point decrease | 0 | |
|
Wolf Creek [Member]
|
||
| Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year | 7.00% | 7.50% |
| Effect on total of service and interest cost from one-percentage-point increase | (8) | |
| Effect on total of service and interest cost from one-percentage-point decrease | 8 | |
| Effect on post-retirement benefit obligation from one-percentage-point increase | (111) | |
| Effect on post-retirement benefit obligation from one-percentage-point decrease | $ 113 | |
| X | ||||||||||
|
- Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Fair Value of Plan Assets) (Details) (Wolf Creek [Member], USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Fair value of pension plan assets | $ 124,660 | $ 114,734 |
|
Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Level 2
|
||
| Fair value of pension plan assets | 114,702 | 105,493 |
|
Level 3
|
||
| Fair value of pension plan assets | 9,958 | 9,241 |
|
Domestic Equity Securities [Member]
|
||
| Fair value of pension plan assets | 31,580 | 30,599 |
|
Domestic Equity Securities [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Domestic Equity Securities [Member] | Level 2
|
||
| Fair value of pension plan assets | 31,580 | 30,599 |
|
Domestic Equity Securities [Member] | Level 3
|
||
| Fair value of pension plan assets | 0 | 0 |
|
International Equity Securities [Member]
|
||
| Fair value of pension plan assets | 38,624 | 36,868 |
|
International Equity Securities [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
International Equity Securities [Member] | Level 2
|
||
| Fair value of pension plan assets | 38,624 | 36,868 |
|
International Equity Securities [Member] | Level 3
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Core Bonds [Member]
|
||
| Fair value of pension plan assets | 31,854 | 26,926 |
|
Core Bonds [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Core Bonds [Member] | Level 2
|
||
| Fair value of pension plan assets | 31,854 | 26,926 |
|
Core Bonds [Member] | Level 3
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Real Estate [Member]
|
||
| Fair value of pension plan assets | 11,962 | 10,534 |
|
Real Estate [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Real Estate [Member] | Level 2
|
||
| Fair value of pension plan assets | 6,313 | 5,440 |
|
Real Estate [Member] | Level 3
|
||
| Fair value of pension plan assets | 5,649 | 5,094 |
|
Commodities [Member]
|
||
| Fair value of pension plan assets | 5,887 | 5,245 |
|
Commodities [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Commodities [Member] | Level 2
|
||
| Fair value of pension plan assets | 5,887 | 5,245 |
|
Commodities [Member] | Level 3
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Alternative Investments [Member]
|
||
| Fair value of pension plan assets | 4,309 | 4,147 |
|
Alternative Investments [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Alternative Investments [Member] | Level 2
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Alternative Investments [Member] | Level 3
|
||
| Fair value of pension plan assets | 4,309 | 4,147 |
|
Cash Equivalents [Member]
|
||
| Fair value of pension plan assets | 444 | 415 |
|
Cash Equivalents [Member] | Level 1
|
||
| Fair value of pension plan assets | 0 | 0 |
|
Cash Equivalents [Member] | Level 2
|
||
| Fair value of pension plan assets | 444 | 415 |
|
Cash Equivalents [Member] | Level 3
|
||
| Fair value of pension plan assets | $ 0 | $ 0 |
| X | ||||||||||
|
- Definition
Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Changes in Level 3 Plan Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2014
Level 3
|
Dec. 31, 2013
Level 3
|
Dec. 31, 2014
Level 3
Wolf Creek [Member]
|
Dec. 31, 2013
Level 3
Wolf Creek [Member]
|
Dec. 31, 2014
Real Estate [Member]
Level 3
|
Dec. 31, 2013
Real Estate [Member]
Level 3
|
Dec. 31, 2014
Real Estate [Member]
Level 3
Wolf Creek [Member]
|
Dec. 31, 2013
Real Estate [Member]
Level 3
Wolf Creek [Member]
|
Dec. 31, 2014
Alternative Investments [Member]
Level 3
|
Dec. 31, 2013
Alternative Investments [Member]
Level 3
|
Dec. 31, 2014
Alternative Investments [Member]
Level 3
Wolf Creek [Member]
|
Dec. 31, 2013
Alternative Investments [Member]
Level 3
Wolf Creek [Member]
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |||||||||||||||
| Balance at period start | $ 32,565 | $ 30,003 | $ 12,764 | $ 85,681 | $ 84,955 | $ 9,241 | $ 8,441 | $ 24,022 | $ 20,927 | $ 5,094 | $ 4,541 | $ 39,171 | $ 45,535 | $ 4,147 | $ 3,900 |
| Actual gain (loss) on plan assets relating to assets still held at the reporting date | (4,446) | (9,088) | (717) | (800) | (2,630) | (3,307) | (555) | (553) | (1,970) | (1,936) | (162) | (247) | |||
| Actual gain (loss) on plan assets relating to assets sold during the period | 1,394 | 826 | (29) | 0 | 0 | 826 | |||||||||
| Purchases, issuances and settlements, net | 55 | (9,188) | (242) | (212) | 0 | (9,126) | |||||||||
| Balance at period end | $ 32,565 | $ 30,003 | $ 12,764 | $ 91,576 | $ 85,681 | $ 9,958 | $ 9,241 | $ 26,439 | $ 24,022 | $ 5,649 | $ 5,094 | $ 41,141 | $ 39,171 | $ 4,309 | $ 4,147 |
| X | ||||||||||
|
- Definition
Actual return on plan assets, separately identifying the amount related to assets sold during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Wolf Creek Employee Benefit Plans Wolf Creek Employee Benefit Plans (Expected Cash Flows Related To Pension and Post-Retirement Benefit Plans) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2014
|
|
|
Plan Trust [Member] | Pension Benefits [Member]
|
|
| Expected contributions: | |
| 2014 | $ 42.0 |
| Expected benefit payments: | |
| 2014 | (35.1) |
| 2015 | (37.3) |
| 2016 | (39.5) |
| 2017 | (41.9) |
| 2018 | (44.2) |
| 2019 - 2022 | (257.8) |
|
Plan Trust [Member] | Pension Benefits [Member] | Wolf Creek [Member]
|
|
| Expected contributions: | |
| 2014 | 4.7 |
| Expected benefit payments: | |
| 2014 | (5.4) |
| 2015 | (6.1) |
| 2016 | (6.8) |
| 2017 | (7.5) |
| 2018 | (8.2) |
| 2019 - 2022 | (51.0) |
|
Plan Trust [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Expected contributions: | |
| 2014 | 0 |
| Expected benefit payments: | |
| 2014 | (8.2) |
| 2015 | (8.3) |
| 2016 | (8.4) |
| 2017 | (8.6) |
| 2018 | (8.7) |
| 2019 - 2022 | (43.5) |
|
Plan Trust [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|
| Expected contributions: | |
| 2014 | 0.6 |
| Expected benefit payments: | |
| 2014 | (0.6) |
| 2015 | (0.6) |
| 2016 | (0.6) |
| 2017 | (0.6) |
| 2018 | (0.7) |
| 2019 - 2022 | (3.2) |
|
Company Assets [Member] | Pension Benefits [Member]
|
|
| Expected benefit payments: | |
| 2014 | (2.8) |
| 2015 | (2.8) |
| 2016 | (2.8) |
| 2017 | (2.7) |
| 2018 | (2.7) |
| 2019 - 2022 | (13.0) |
|
Company Assets [Member] | Pension Benefits [Member] | Wolf Creek [Member]
|
|
| Expected benefit payments: | |
| 2014 | (0.2) |
| 2015 | (0.2) |
| 2016 | (0.2) |
| 2017 | (0.2) |
| 2018 | (0.2) |
| 2019 - 2022 | (1.1) |
|
Company Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
|
|
| Expected benefit payments: | |
| 2014 | (0.2) |
| 2015 | (0.2) |
| 2016 | (0.2) |
| 2017 | (0.2) |
| 2018 | (0.2) |
| 2019 - 2022 | (1.0) |
|
Company Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Wolf Creek [Member]
|
|
| Expected benefit payments: | |
| 2014 | 0 |
| 2015 | 0 |
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 - 2022 | $ 0 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Wolf Creek Employee Benefit Plans (Textual) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| 401k Savings Plan Matching Contributions | $ 7.0 | $ 6.9 | $ 7.1 |
|
KGE [Member]
|
|||
| Subsidiary's interest, percentage | 47.00% | ||
|
Wolf Creek [Member]
|
|||
| 401k Savings Plan Matching Contributions | $ 1.4 | $ 1.4 | $ 1.3 |
|
International Equity Securities [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 31.00% | ||
|
Domestic Equity Securities [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 25.00% | ||
|
Debt Securities [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 25.00% | ||
|
Real Estate [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 10.00% | ||
|
Commodity [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 5.00% | ||
|
Other Investments [Member] | Wolf Creek [Member]
|
|||
| Target Defined Benefit Plan Asset Allocations | 4.00% | ||
| X | ||||||||||
|
- Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the cost recognized during the period for defined contribution plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Subsidiary's interest in defined benefit plans. No definition available.
|
|
Commitments And Contingencies (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
phases
MW
Y
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Aggregate Amount of Required Payments [Abstract] | |||
| 2014 | $ 406,859,000 | ||
| 2015 | 39,551,000 | ||
| 2016 | 9,223,000 | ||
| Thereafter | 27,247,000 | ||
| Total amount committed | 482,880,000 | ||
| Environmental Projects [Abstract] | |||
| Entity Share of Environmental Upgrades of Jointly Owned Plant | 610,000,000 | ||
| Proposed Increase In Annual Retail Revenues | 4,000,000 | 30,700,000 | 50,000,000 |
| EPA Consent Decree [Abstract] | |||
| Estimate of cost of selective catalytic reduction equipment | 225,000,000 | ||
| Nuclear Decommissioning [Abstract] | |||
| Site study frequency | 3 | ||
| Number of nuclear decommissioning phases | 2 | ||
| phase one of nuclear decommissioning plan | 1 | ||
| phase two of nuclear decommissioning plan | 2 | ||
| Estimated decommissioning costs | 360,000,000 | ||
| Previously estimated decommissioning costs | 296,200,000 | ||
| Decommissioning fund deposits | 2,800,000 | 2,900,000 | 3,200,000 |
| Total Nuclear Decommissioning Trust | 185,016,000 | 175,625,000 | |
| Fee for future disposal of spent nuclear fuel | 800,000 | 3,000,000 | 3,600,000 |
| Nuclear Insurance Industry Aggregate Limit | 3,200,000,000 | ||
| Nuclear Liability Insurance - Full Limit of Public Liability | 13,600,000,000 | ||
| Nuclear Liability Insurance - Maximum Available Commercial Insurance | 375,000,000 | ||
| Nuclear Liability Insurance - Industry-Wide Retrospective Assessment Program | 13,200,000,000 | ||
| Nuclear Liability Insurance - Owners' Insurance Amount Maximum | 127,300,000 | ||
| Nuclear Liability Insurance - Entity Share of Insurance Amount Maximum | 59,800,000 | ||
| Nuclear Liability Insurance - Owners' Insurance Amount, Per Incident | 19,000,000 | ||
| Nuclear Liability Insurance - Entity Share of Insurance Amount, Per Incident | 8,900,000 | ||
| Nuclear Liability Insurance - Owners' Property Insurance, Maximum | 2,800,000,000 | ||
| nuclear liability insurance - owner's property insurance assessment maximum | 39,500,000 | ||
| nuclear liability insurance - equity share, property insurance assessment maximum | 18,600,000 | ||
| Transmission Capacity per Contractual Obligations | 306 | ||
| Net Capacity, in MW | 3,092 | ||
| Cost of Transmission | 34,000,000 | ||
|
2011 Through 2015 Generation Capacity Peak Demand [Member]
|
|||
| Renewable Energy Standard [Abstract] | |||
| Renewable energy generation capacity, percentage | 10.00% | ||
|
2016 Through 2019 Generation Capacity Peak Demand [Member]
|
|||
| Renewable Energy Standard [Abstract] | |||
| Renewable energy generation capacity, percentage | 15.00% | ||
|
2020 And Thereafter Generation Capacity Peak Demand [Member]
|
|||
| Renewable Energy Standard [Abstract] | |||
| Renewable energy generation capacity, percentage | 20.00% | ||
|
Uranium Concentrates [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | 27,100,000 | ||
|
Conversion [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | 4,100,000 | ||
|
Enrichment [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | 93,300,000 | ||
|
Fabrication [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | 33,300,000 | ||
|
Coal and Coal Transportation [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | 1,100,000,000 | ||
|
Natural Gas Transportation [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Long-term purchase commitment | $ 118,500,000 | ||
|
Transmission Service Agreements One [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Net Capacity, in MW | 200 | ||
|
Transmission Service Agreements Two [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Net Capacity, in MW | 106 | ||
|
Next Year [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Other Commitments [Table Text Block] | 68.2 | ||
|
Thereafter [Member]
|
|||
| Nuclear Decommissioning [Abstract] | |||
| Other Commitments [Table Text Block] | 110 | ||
| X | ||||||||||
|
- Definition
Cost incurred for transmission operations and maintenance by total kilowatt-hours paid to sources. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The minimum amount the entity agreed to spend under the long-term purchase commitment. No definition available.
|
| X | ||||||||||
|
- Definition
Tabular disclosure of information about obligations resulting from other commitments. No definition available.
|
| X | ||||||||||
|
- Definition
The cash outflow for the purchase of investments that will be held in a decommissioning trust fund. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Committed Purchase Obligations No definition available.
|
| X | ||||||||||
|
- Definition
Committed Purchase Obligations Due After Third Year No definition available.
|
| X | ||||||||||
|
- Definition
Committed Purchase Obligations Due In Second Year No definition available.
|
| X | ||||||||||
|
- Definition
Committed Purchase Obligations Due In Third Year No definition available.
|
| X | ||||||||||
|
- Definition
Committed Purchase Obligations Due Within One Year No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Estimated Decommissioning Costs No definition available.
|
| X | ||||||||||
|
- Definition
The estimated cost to install environmental equipment on a power plant. No definition available.
|
| X | ||||||||||
|
- Definition
Fee for Future Disposal of Spent Nuclear Fuel No definition available.
|
| X | ||||||||||
|
- Definition
Industry Aggregate Limit For Nuclear Insurance No definition available.
|
| X | ||||||||||
|
- Definition
Net capacity, in megawatts No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Entity Share of Insurance Amount Maximum No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Entity Share of Insurance Amount, Per Incident No definition available.
|
| X | ||||||||||
|
- Definition
nuclear liability insurance - equity share, property insurance assessment maximum No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Full Limit of Public Liability No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Industry-Wide Retrospective Assessment Program No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Maximum Available Commercial Insurance No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Owners' Insurance Amount Maximum No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Owners' Insurance Amount, Per Incident No definition available.
|
| X | ||||||||||
|
- Definition
nuclear liability insurance - owner's property insurance assessment maximum No definition available.
|
| X | ||||||||||
|
- Definition
Nuclear Liability Insurance - Owners' Property Insurance, Maximum No definition available.
|
| X | ||||||||||
|
- Definition
Number of Nuclear Decommissioning Plan Review Phases No definition available.
|
| X | ||||||||||
|
- Definition
phase one of nuclear decommissioning plan No definition available.
|
| X | ||||||||||
|
- Definition
phase two of nuclear decommissioning plan No definition available.
|
| X | ||||||||||
|
- Definition
Previously Estimated Decommissioning Costs No definition available.
|
| X | ||||||||||
|
- Definition
Entity's share of the total amount of proposed environmental upgrades at a jointly owned utility plant. No definition available.
|
| X | ||||||||||
|
- Definition
Proposed Increase In Annual Retail Revenues No definition available.
|
| X | ||||||||||
|
- Definition
Renewable Energy Generation Capacity No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Site Study Frequency No definition available.
|
| X | ||||||||||
|
- Definition
Transmission Capacity per Contractual Obligations No definition available.
|
|
Asset Retirement Obligations (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Regulatory Liabilities [Line Items] | ||
| KGE ownership share | 47.00% | |
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
| Beginning ARO | $ 160,682 | $ 152,648 |
| Liabilities settled | (593) | (973) |
| Accretion expense | 10,316 | 9,007 |
| Revised ARO estimate | 9,580 | 0 |
| Ending ARO | 230,668 | 160,682 |
| Regulatory liability - removal costs | 343,485 | 329,556 |
|
Removal Costs [Member]
|
||
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
| Regulatory liability - removal costs | 88,242 | 114,148 |
|
Wolf Creek [Member]
|
||
| Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
| Revised ARO estimate | $ 50,683 | $ 0 |
| X | ||||||||||
|
- Definition
The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Common and Preferred Stock (Common Stock Details) (USD $)
In Millions, except Share data, unless otherwise specified |
1 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Feb. 28, 2015
|
Dec. 31, 2014
months
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Feb. 01, 2015
|
||||||
| Common Stock [Line Items] | ||||||||||
| Common stock, shares authorized | 275,000,000 | 275,000,000 | 150,000,000 | |||||||
| Common stock, shares issued | 131,687,454 | 128,254,229 | ||||||||
| Forward Sale Agreement, Maximum Amount Authorized | $ 500.0 | |||||||||
| Forward Sale Agreement, Maximum Shares Authorized | 25,000,000 | |||||||||
| Commissions Paid, Percentage of Sales Price of Shares Sold | 1.00% | |||||||||
| Forward Contract Indexed to Issuer's Equity, Settlement Period | 18 | |||||||||
| Forward Contract Indexed To Issuers Equity, Indexed Shares For Period | 200,000 | 2,892,476 | [1] | 1,068,112 | [1] | 0 | [1] | |||
| Forward Contract Indexed to Issuer's Equity, Estimated Proceeds | $ 258.3 | $ 7.5 | ||||||||
| Average forward price of shares | $ 28.20 | |||||||||
|
Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member]
|
||||||||||
| Common Stock [Line Items] | ||||||||||
| Forward Contract Indexed to Issuer's Equity, Shares | 8,900,000 | |||||||||
| Commissions Paid, Percentage of Sales Price of Shares Sold | 3.50% | |||||||||
| Forward Contract Indexed to Issuer's Equity, Settlement Period | 24 | |||||||||
| Shares Borrowed Under Forward Contracts, Price Per Share | $ 31.15 | |||||||||
|
Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member] | Over Allotment [Member]
|
||||||||||
| Common Stock [Line Items] | ||||||||||
| Forward Contract Indexed to Issuer's Equity, Shares | 900,000 | |||||||||
|
Base Allotment [Member] | Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member]
|
||||||||||
| Common Stock [Line Items] | ||||||||||
| Forward Contract Indexed to Issuer's Equity, Shares | 8,000,000 | |||||||||
|
Direct Stock Purchase Plan And Other Stock-Based Plans [Member]
|
||||||||||
| Common Stock [Line Items] | ||||||||||
| Common stock, shares issued | 500,000 | 700,000 | ||||||||
|
DSPP [Member]
|
||||||||||
| Common Stock [Line Items] | ||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,600,000 | 2,000,000 | ||||||||
|
||||||||||
| X | ||||||||||
|
- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Commissions Paid, Percentage of Sales Price of Shares Sold No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Estimated Proceeds No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed To Issuers Equity,Indexed Shares For Period No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Settlement Period No definition available.
|
| X | ||||||||||
|
- Definition
Forward Sale Agreement, Maximum Amount Authorized No definition available.
|
| X | ||||||||||
|
- Definition
Forward Sale Agreement, Maximum Shares Authorized No definition available.
|
| X | ||||||||||
|
- Definition
Number Of Common Shares Available Under Stock Issuance Program No definition available.
|
| X | ||||||||||
|
- Definition
Price Per Share Of Shares Borrowed Under Forward Contracts No definition available.
|
|
Common and Preferred Stock (Preferred Stock Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2012
|
Jun. 30, 2012
|
|
| Preferred Stock, Value, Issued | $ 21,436 | $ 0 |
| Preferred stock, shares outstanding | 214,363 | |
| Preferred Stock Redemption Premium | 1,131 | |
| Total Cost to Redeem | 22,567 | |
|
Redeemable Preferred Stock Rate One [Member]
|
||
| Preferred Stock, Value, Issued | 12,161 | |
| Preferred Stock, Dividend Rate, Percentage | 4.50% | |
| Preferred stock, shares outstanding | 121,613 | |
| Preferred Stock Redemption Premium | 973 | |
| Total Cost to Redeem | 13,134 | |
|
Redeemable Preferred Stock Rate Two [Member]
|
||
| Preferred Stock, Value, Issued | 5,497 | |
| Preferred Stock, Dividend Rate, Percentage | 4.25% | |
| Preferred stock, shares outstanding | 54,970 | |
| Preferred Stock Redemption Premium | 82 | |
| Total Cost to Redeem | 5,579 | |
|
Redeemable Preferred Stock Rate Three [Member]
|
||
| Preferred Stock, Value, Issued | 3,778 | |
| Preferred Stock, Dividend Rate, Percentage | 5.00% | |
| Preferred stock, shares outstanding | 37,780 | |
| Preferred Stock Redemption Premium | 76 | |
| Total Cost to Redeem | $ 3,854 |
| X | ||||||||||
|
- Definition
The percentage rate used to calculate dividend payments on preferred stock. No definition available.
|
| X | ||||||||||
|
- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Premium Required To Redeem Preferred Stock No definition available.
|
| X | ||||||||||
|
- Definition
Total Cost To Redeem Preferred Stock No definition available.
|
|
Common and Preferred Stock Common and Preferred Stock (Schedule of Forward Contracts Indexed to Issuer's Equity) (USD $)
|
1 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Feb. 28, 2015
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Feb. 01, 2015
|
Dec. 31, 2011
|
||||||||
| Forward Contract Indexed to Issuer's Equity [Line Items] | |||||||||||||
| Stock Issued During Period, Value, New Issues | $ 87,669,000 | $ 32,906,000 | $ 6,996,000 | ||||||||||
| Forward Sale Agreement, Number of Shares | 9,160,500 | [1] | 12,052,976 | [1] | 1,753,415 | [1] | 0 | ||||||
| Shares Borrowed Under Forward Contracts | 0 | 11,367,673 | 1,753,415 | ||||||||||
| Forward Contract Indexed To Issuers Equity, Indexed Shares For Period | 200,000 | 2,892,476 | [2] | 1,068,112 | [2] | 0 | [2] | ||||||
| Forward Contract Indexed to Issuer's Equity, Estimated Proceeds | 258,300,000 | 7,500,000 | |||||||||||
| Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 28.20 | ||||||||||||
|
Forward Contracts [Member]
|
|||||||||||||
| Forward Contract Indexed to Issuer's Equity [Line Items] | |||||||||||||
| Stock Issued During Period, Value, New Issues | $ 82,900,000 | $ 27,000,000 | |||||||||||
|
|||||||||||||
| X | ||||||||||
|
- Definition
The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Estimated Proceeds No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed To Issuers Equity,Indexed Shares For Period No definition available.
|
| X | ||||||||||
|
- Definition
Forward Sale Agreement, Number of Shares No definition available.
|
| X | ||||||||||
|
- Definition
Shares Borrowed Under Forward Contracts No definition available.
|
|
Variable Interest Entities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Variable Interest Entity [Line Items] | ||
| Noncontrolling Interest, Decrease from Deconsolidation | $ 7,342 | $ 14,282 |
|
Jeffrey Energy Center [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Variable Interest Entity Percentage of Asset Held | 8.00% | |
| Agreement expiration date | Jan. 31, 2019 | |
|
La Cygne Generating Station [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Variable Interest Entity Percentage of Asset Held | 50.00% | |
| Agreement expiration date | Sep. 30, 2029 | |
|
Railroad Transportation Equipment [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Agreement expiration date | May 31, 2013 | |
| Noncontrolling Interest, Decrease from Deconsolidation | 14,300 | |
|
Railroad Transportation Equipment 2 [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Agreement expiration date | Nov. 30, 2014 | |
| Noncontrolling Interest, Decrease from Deconsolidation | $ 7,300 | |
| X | ||||||||||
|
- Definition
Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
|
|
Variable Interest Entities (Assets And Liabilities In Relation To VIEs) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
||||||
|---|---|---|---|---|---|---|---|---|
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | $ 8,162,908 | $ 7,551,916 | ||||||
| Regulatory Assets | 859,778 | 755,414 | ||||||
| Current maturities of long-term debt | 0 | 250,000 | ||||||
| Accrued interest | 79,707 | 80,457 | ||||||
| Long-term debt, net | 3,215,539 | 2,968,958 | ||||||
|
Variable Interest Entity, Primary Beneficiary [Member]
|
||||||||
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | 278,573 | 296,626 | ||||||
| Regulatory Assets | 7,882 | [1] | 6,792 | [1] | ||||
| Current maturities of long-term debt | 27,933 | 27,479 | ||||||
| Accrued interest | 2,961 | [2] | 3,472 | [2] | ||||
| Long-term debt, net | $ 166,565 | $ 194,802 | ||||||
|
||||||||
| X | ||||||||||
|
- Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
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- Details
|
|
Leases (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
Minimum [Member]
Y
|
Dec. 31, 2014
Maximum [Member]
Y
|
Dec. 31, 2014
Vehicles [Member]
|
Dec. 31, 2013
Vehicles [Member]
|
Dec. 31, 2014
Vehicles [Member]
Minimum [Member]
Y
|
Dec. 31, 2014
Vehicles [Member]
Maximum [Member]
Y
|
Dec. 31, 2014
Computer Equipment [Member]
|
Dec. 31, 2013
Computer Equipment [Member]
|
Dec. 31, 2014
Computer Equipment [Member]
Minimum [Member]
Y
|
Dec. 31, 2014
Computer Equipment [Member]
Maximum [Member]
Y
|
|
| Leases [Line Items] | ||||||||||
| Lease term in years | 1 | 20 | 2 | 8 | 3 | 5 | ||||
| Capital leased assets gross | $ 18,819 | $ 12,141 | $ 1,504 | $ 1,758 | ||||||
| X | ||||||||||
|
- Definition
Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Lease Term No definition available.
|
|
Leases Leases (Operating Leases, Minimum Annual Rental Payments) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Rental expense: | |||
| Rental expense | $ 14,143 | $ 16,484 | $ 17,080 |
| Future commitments: | |||
| 2013 | 12,396 | ||
| 2014 | 10,434 | ||
| 2015 | 8,560 | ||
| 2016 | 7,148 | ||
| 2017 | 5,930 | ||
| Thereafter | 9,115 | ||
| Total future commitments | $ 53,583 | ||
| X | ||||||||||
|
- Definition
Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Leases (Assets Recorded Under Capital Leases) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Leases [Line Items] | ||
| Accumulated amortization | $ (11,741) | $ (10,493) |
| Total capital leases | 48,631 | 51,752 |
|
Vehicles [Member]
|
||
| Leases [Line Items] | ||
| Capital leased assets gross | 18,819 | 12,141 |
|
Computer Equipment [Member]
|
||
| Leases [Line Items] | ||
| Capital leased assets gross | 1,504 | 1,758 |
|
Generation Plant [Member]
|
||
| Leases [Line Items] | ||
| Capital leased assets gross | $ 40,049 | $ 48,346 |
| X | ||||||||||
|
- Definition
Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Leases (Capital Leases, Minimum Annual Rental Payments) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
|
|---|---|
| Leases [Abstract] | |
| 2013 | $ 6,379 |
| 2014 | 5,717 |
| 2015 | 5,284 |
| 2016 | 5,131 |
| 2017 | 4,493 |
| Thereafter | 59,660 |
| Total future commitments | 86,664 |
| Amounts representing imputed interest | (34,922) |
| Present value of net minimum lease payments under capital leases | 51,742 |
| Less: current portion | 3,833 |
| Total long-term obligation under capital leases | $ 47,909 |
| X | ||||||||||
|
- Definition
Amount of capital lease obligation due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount necessary to reduce net minimum lease payments to present value for capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Quarterly Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|||||||||||
| Quarterly Results [Line Items] | |||||||||||||||||||||
| Revenues | $ 596,439 | [1] | $ 764,040 | [1] | $ 612,668 | [1] | $ 628,556 | [1] | $ 559,878 | [1] | $ 694,974 | [1] | $ 569,589 | [1] | $ 546,212 | [1] | $ 2,601,703 | $ 2,370,654 | $ 2,261,470 | ||
| Net income | 45,773 | [1] | 149,760 | [1] | 55,822 | [1] | 70,970 | [1] | 43,061 | [1] | 135,095 | [1] | 69,451 | [1] | 53,256 | [1] | 322,325 | 300,863 | 282,462 | ||
| Net Income attributable to common stock | $ 43,449 | [1] | $ 147,382 | [1] | $ 53,473 | [1] | $ 68,955 | [1] | $ 41,062 | [1] | $ 133,125 | [1] | $ 67,188 | [1] | $ 51,144 | [1] | $ 313,259 | $ 292,520 | $ 273,530 | ||
| Basic: Earnings available | $ 0.33 | [1] | $ 1.13 | [1] | $ 0.41 | [1] | $ 0.53 | [1] | $ 0.32 | [1] | $ 1.04 | [1] | $ 0.53 | [1] | $ 0.40 | [1] | $ 2.40 | $ 2.29 | $ 2.15 | ||
| Diluted: Earnings available | $ 0.32 | [1] | $ 1.10 | [1] | $ 0.40 | [1] | $ 0.52 | [1] | $ 0.32 | [1] | $ 1.04 | [1] | $ 0.52 | [1] | $ 0.40 | [1] | $ 2.35 | $ 2.27 | $ 2.15 | ||
| Cash dividend declared per common share | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.35 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 0.34 | [1] | $ 1.40 | $ 1.36 | $ 1.32 | ||
|
High [Member]
|
|||||||||||||||||||||
| Quarterly Results [Line Items] | |||||||||||||||||||||
| Market price per common share | $ 43.15 | [1] | $ 38.23 | [1] | $ 38.24 | [1] | $ 35.33 | [1] | $ 32.56 | [1] | $ 34.31 | [1] | $ 34.96 | [1] | $ 33.35 | [1] | |||||
|
Low [Member]
|
|||||||||||||||||||||
| Quarterly Results [Line Items] | |||||||||||||||||||||
| Market price per common share | $ 33.73 | [1] | $ 33.76 | [1] | $ 34.51 | [1] | $ 31.67 | [1] | $ 29.95 | [1] | $ 29.79 | [1] | $ 30.13 | [1] | $ 28.59 | [1] | |||||
|
|||||||||||||||||||||
| X | ||||||||||
|
- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Common Stock, Market Price Per Share No definition available.
|
|
Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|||||
|
Allowance for Doubtful Accounts [Member]
|
|||||||
| Movement in Valuation Allowances and Reserves [Roll Forward] | |||||||
| Balance at Beginning of Period | $ 4,596 | $ 4,916 | $ 7,384 | ||||
| Charged to Costs and Expenses | 9,752 | 7,039 | 6,617 | ||||
| Deductions | (9,039) | (7,359) | [1] | (9,085) | [1] | ||
| Balance at End of Period | $ 5,309 | $ 4,596 | $ 4,916 | ||||
|
|||||||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|