Document and Entity Information Document - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Apr. 27, 2016 |
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| Entity Information [Line Items] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Mar. 31, 2016 | |
| Document Fiscal Year Focus | 2016 | |
| Document Fiscal Period Focus | Q1 | |
| 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 | 141,681,275 |
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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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- 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 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 Trading symbol of an instrument as listed on an exchange. No definition available.
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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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- 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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- 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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- 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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- 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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- 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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- 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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- References No definition available.
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| 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
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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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- 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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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, netted by jurisdiction and classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- 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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- 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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- References No definition available.
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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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- References No definition available.
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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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- 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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- 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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- References No definition available.
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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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- 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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- 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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- References No definition available.
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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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- 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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- Details
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Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| CURRENT ASSETS: | ||
| Allowance for doubtful accounts | $ 6,790 | $ 5,294 |
| Westar Energy, Inc. Shareholders' Equity: | ||
| Common stock, par value | $ 5 | $ 5 |
| Common stock, shares authorized | 275,000,000 | 275,000,000 |
| Common stock, shares issued | 141,628,562 | 141,353,426 |
| Common stock, shares outstanding | 141,628,562 | 141,353,426 |
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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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- References No definition available.
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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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- 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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- 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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- 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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- References No definition available.
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Consolidated Statements Of Income - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
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| REVENUES | $ 569,450 | $ 590,807 |
| OPERATING EXPENSES: | ||
| Fuel and purchased power | 100,058 | 155,482 |
| Network Transmission Cost | 60,760 | 56,812 |
| Operating and maintenance | 77,757 | 85,080 |
| Depreciation and amortization | 83,640 | 74,586 |
| Selling, general and administrative | 56,456 | 55,418 |
| Taxes, Miscellaneous | 48,968 | 37,871 |
| Total Operating Expenses | 427,639 | 465,249 |
| INCOME FROM OPERATIONS | 141,811 | 125,558 |
| OTHER INCOME (EXPENSE): | ||
| Investment earnings (losses) | 2,016 | 2,480 |
| Other income | 9,477 | 2,814 |
| Other expense | (5,543) | (5,713) |
| Total Other Income | 5,950 | (419) |
| Interest expense | 40,431 | 44,298 |
| INCOME BEFORE INCOME TAXES | 107,330 | 80,841 |
| Income tax expense | 38,622 | 27,678 |
| NET INCOME | 68,708 | 53,163 |
| Less: Net income attributable to noncontrolling interests | 3,123 | 2,183 |
| NET INCOME ATTRIBUTABLE TO WESTAR ENERGY, INC. | $ 65,585 | $ 50,980 |
| Earnings Per Share [Abstract] | ||
| Earnings Per Share, Basic | $ 0.46 | $ 0.38 |
| Earnings Per Share, Diluted | $ 0.46 | $ 0.38 |
| AVERAGE EQUIVALENT COMMON SHARES OUTSTANDING | ||
| Weighted Average Number of Shares Outstanding , Basic | 141,992,846 | 132,395,497 |
| Weighted Average Number of Shares Outstanding, Diluted | 142,311,228 | 135,539,631 |
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.38 | $ 0.36 |
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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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- Definition Total costs of sales and operating expenses for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- References No definition available.
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| 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
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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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- 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 | ||||||||||
- 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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- 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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- 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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- 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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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- References No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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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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- 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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- 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 | ||||||||||
- 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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- 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
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| 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
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| 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
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- 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
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| 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
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Fuel and purchased power expense incurred that are directly related to goods produced and sold. No definition available.
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| X | ||||||||||
- Definition Network Transmission Cost No definition available.
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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | ||
| Net income | $ 68,708 | $ 53,163 |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 83,640 | 74,586 |
| Amortization of nuclear fuel | 8,329 | 4,960 |
| Amortization of deferred regulatory gain from sale leaseback | (1,374) | (1,374) |
| Amortization of corporate-owned life insurance | 5,261 | 5,747 |
| Non-cash compensation | 2,491 | 2,226 |
| Net deferred income taxes and credits | 33,984 | 26,573 |
| Allowance for equity funds used during construction | (2,464) | (1,950) |
| Changes in working capital items: | ||
| Accounts receivable | 33,196 | 31,042 |
| Fuel inventory and supplies | 109 | (18,404) |
| Prepaid expenses and other | 7,712 | 4,638 |
| Accounts payable | (31,158) | 17,321 |
| Accrued taxes | 49,339 | 40,007 |
| Other current liabilities | (28,984) | (20,327) |
| Changes in other assets | 21,933 | (17,034) |
| Changes in other liabilities | (11,846) | 12,394 |
| Cash Flows from Operating Activities | 238,876 | 213,568 |
| CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: | ||
| Additions to property, plant and equipment | (220,849) | (187,223) |
| Purchase of securities - trusts | (13,712) | (7,345) |
| Sale of securities - trusts | 16,332 | 7,847 |
| Proceeds from investment in corporate-owned life insurance | 23,963 | 1,144 |
| Investment in affiliated company | (655) | 0 |
| Other investing activities | (2,840) | (717) |
| Cash Flows used in Investing Activities | (197,761) | (186,294) |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Short-term debt, net | 66,500 | 167,800 |
| Retirements of long-term debt | 0 | (125,000) |
| Repayment of capital leases | (675) | (886) |
| Borrowings against cash surrender value of corporate-owned life insurance | 963 | 1,045 |
| Repayment of borrowings against cash surrender value of corporate-owned life insurance | (22,837) | (899) |
| Issuance of common stock | 657 | 8,206 |
| Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (2,550) | (1,076) |
| Cash dividends paid | (49,665) | (43,787) |
| Other financing activities | (4,961) | (3,234) |
| Cash Flows from Financing Activities | (40,875) | (25,756) |
| NET CHANGE IN CASH AND CASH EQUIVALENTS | 240 | 1,518 |
| CASH AND CASH EQUIVALENTS: | ||
| Beginning of period | 3,231 | 4,556 |
| End of period | 3,471 | 6,074 |
| Variable Interest Entity [Member] | ||
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Proceeds from long-term debt | 162,048 | 0 |
| Retirements of long-term debt | (190,355) | (27,925) |
| Noncontrolling Interest [Member] | ||
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | ||
| Net income | 3,123 | 2,183 |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | $ (2,550) | $ (1,076) |
| X | ||||||||||
- References No definition available.
|
| 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
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| X | ||||||||||
- References No definition available.
|
| 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
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| 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 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 | ||||||||||
- References No definition available.
|
| 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 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 | ||||||||||
- References No definition available.
|
| 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
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| X | ||||||||||
- References No definition available.
|
| 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
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| X | ||||||||||
- References No definition available.
|
| 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
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| 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 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
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| 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 The cash inflow from borrowings against the cash surrender value of corporate-owned life insurance polices. 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.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands |
Total |
Common Stock [Member] |
Paid-In Capital [Member] |
Retained Earnings [Member] |
Noncontrolling Interest [Member] |
|---|---|---|---|---|---|
| Beginning Balance at Dec. 31, 2014 | $ 3,301,307 | $ 658,437 | $ 1,781,120 | $ 855,299 | $ 6,451 |
| Beginning Balance (Shares) at Dec. 31, 2014 | 131,687,454 | ||||
| Net income | 53,163 | $ 0 | 0 | 50,980 | 2,183 |
| Issuance of stock | 8,206 | $ 1,314 | 6,892 | 0 | 0 |
| Issuance Of Stock For Compensation And Reinvested Dividends, Shares | 215,873 | ||||
| Issuance of stock (shares) | 262,827 | ||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 3,028 | $ 1,080 | 1,948 | ||
| Tax withholding related to stock compensation | (3,234) | 3,234 | |||
| Dividends on common stock | (48,107) | 0 | 0 | (48,107) | 0 |
| Stock compensation expense | 2,205 | 2,205 | |||
| Tax Benefit on stock compensation | 1,073 | 0 | 1,073 | 0 | 0 |
| Distributions to shareholders of noncontrolling interests | (1,076) | (1,076) | |||
| Ending Balance at Mar. 31, 2015 | 3,315,348 | $ 660,831 | 1,788,787 | 858,172 | 7,558 |
| Ending Balance (Shares) at Mar. 31, 2015 | 132,166,154 | ||||
| Stockholders' Equity, Other | (1,217) | (1,217) | |||
| Beginning Balance at Dec. 31, 2015 | 3,671,963 | $ 706,767 | 2,004,124 | 945,830 | 15,242 |
| Beginning Balance (Shares) at Dec. 31, 2015 | 141,353,426 | ||||
| Net income | 68,708 | $ 0 | 0 | 65,585 | 3,123 |
| Issuance of stock | 657 | $ 75 | 582 | 0 | 0 |
| Issuance Of Stock For Compensation And Reinvested Dividends, Shares | 260,229 | ||||
| Issuance of stock (shares) | 14,907 | ||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 2,405 | $ 1,301 | 1,104 | ||
| Tax withholding related to stock compensation | (4,961) | 4,961 | |||
| Dividends on common stock | (54,805) | 0 | 0 | (54,805) | 0 |
| Stock compensation expense | 2,462 | 2,462 | |||
| Distributions to shareholders of noncontrolling interests | (2,550) | (2,550) | |||
| Ending Balance at Mar. 31, 2016 | 3,687,205 | $ 708,143 | $ 2,003,311 | 959,936 | $ 15,815 |
| Ending Balance (Shares) at Mar. 31, 2016 | 141,628,562 | ||||
| New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 3,326 | $ 3,326 |
| 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 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 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 Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. 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 Number of shares issued which are neither cancelled nor held in the treasury. 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 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 Issuance Of Stock For Compensation And Reinvested Dividends No definition available.
|
| X | ||||||||||
- Definition Issuance Of Stock For Compensation And Reinvested Dividends, Shares No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Consolidated Statements Of Changes in Equity Parenthetical (Parentheticals) - $ / shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.38 | $ 0.36 |
| 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 |
3 Months Ended |
|---|---|
Mar. 31, 2016 | |
| 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 Quarterly Report on Form 10-Q 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 702,000 customers in Kansas. Westar Energy provides these services in central and northeastern Kansas, including the cities of Topeka, Lawrence, Manhattan, Salina and Hutchinson. Kansas Gas and Electric Company (KGE), Westar Energy’s wholly owned subsidiary, provides these services in south-central and southeastern Kansas, including the city of Wichita. Both Westar Energy and KGE conduct business using the name Westar Energy. Our corporate headquarters is located at 818 South Kansas Avenue, Topeka, Kansas 66612. |
| X | ||||||||||
- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
Summary Of Significant Accounting Policies |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2016 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary Of Significant Accounting Policies | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation We prepare our unaudited condensed consolidated financial statements in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements presented in accordance with generally accepted accounting principles (GAAP) for the United States of America have been condensed or omitted. Our condensed 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. In our opinion, all adjustments, consisting only of normal recurring adjustments considered necessary for a fair presentation of the consolidated financial statements, have been included. The accompanying condensed consolidated financial statements and notes should be read in conjunction with the consolidated financial statements and notes included in our 2015 Form 10-K. Use of Management’s Estimates When we prepare our condensed 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 condensed 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 including the decommissioning of Wolf Creek, environmental issues, VIEs, contingencies and litigation. Actual results may differ from those estimates under different assumptions or conditions. The results of operations for the three months ended March 31, 2016, are not necessarily indicative of the results to be expected for the full year. Fuel Inventory and Supplies We state fuel inventory and supplies at average cost. Following are the balances for fuel inventory and supplies stated separately.
Allowance for Funds Used During Construction 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 as follows:
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 issuable common shares resulting from our forward sale agreements, if any, 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.
_______________ (a)We had no antidilutive securities for the three months ended March 31, 2016 and 2015. 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, the Financial Accounting Standards Board (FASB) issued the following new accounting pronouncements which may affect our accounting and/or disclosure. Leases In February 2016, the FASB issued Accounting Standard Update (ASU) No. 2016-02 which requires lessees to recognize right-of-use assets and lease liabilities, initially measured at present value of the lease payments, on its balance sheet for leases with terms longer than 12 months. Leases are to be classified as either financing or operating leases, with that classification affecting the pattern of expense recognition in the income statement. Accounting for leases by lessors is largely unchanged. The guidance is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The guidance requires a modified retrospective approach for all leases existing at the earliest period presented, or entered into by the date of initial adoption, with certain practical expedients permitted. We are evaluating the guidance and have not yet determined the impact on our consolidated financial statements. Stock-based Compensation In March 2016, the FASB issued ASU No. 2016-09 as part of its simplification initiative. The areas for simplification involve several aspects of the accounting for stock-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, with early adoption permitted. We have elected to adopt effective January 1, 2016. Under current GAAP, if the tax deduction for a stock-based payment award exceeds the compensation cost recorded for financial reporting, the additional tax benefit is recognized in additional paid-in capital and referred to as an excess tax benefit. Tax deficiencies were recognized either as an offset to the accumulated excess tax benefits, if any, or as reduction of income. The issuance of this ASU reflects the FASB’s decision that all prospective excess tax benefits and tax deficiencies should be recognized as income tax benefits and expense. Upon initial adoption, we recorded a $3.3 million cumulative effect adjustment to retained earnings for excess tax benefits that had not previously been recognized. Further, the issuance of this ASU reflects the FASB’s decision that cash flows related to excess tax benefits should be classified as cash flows from operating activities on the consolidated statements of cash flows. Upon adoption, we have retrospectively presented cash flows from operating activities and cash flows used in financing activities on the accompanying condensed consolidated statements of cash flows for the three months ended March 31, 2015, as $1.1 million higher than as previously reported. Financial Instruments In May 2015, the FASB issued ASU No. 2015-07, which removes the requirement to categorize certain investments measured at net asset value (NAV) per share within the fair value hierarchy. The guidance is effective for fiscal years beginning after December 15, 2015. We have adopted this guidance as of January 1, 2016. The adoption was limited to disclosure and does not have a material impact on our consolidated financial statements. See Note 4 “Financial Instruments and Trading Securities.” |
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| X | ||||||||||
- References No definition available.
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- Definition 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 |
3 Months Ended |
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Mar. 31, 2016 | |
| Regulated Operations [Abstract] | |
| Rate Matters And Regulation | RATE MATTERS AND REGULATION KCC Proceedings In December 2015, the Kansas Corporation Commission (KCC) approved an order allowing us to adjust our prices to include costs incurred for property taxes. The new prices were effective in January 2016 and are expected to increase our annual retail revenues by approximately $5.0 million. In March 2016, the KCC issued an order allowing us to adjust our retail prices, subject to refund, to include updated transmission costs as reflected in the transmission formula rate (TFR). The new prices were effective in April 2016 and are expected to increase our annual retail revenues by approximately $25.3 million. We will update our retail prices with the KCC later this year to reflect the TFR with the reduced return on equity (ROE) as described below. We estimate the annualized impact of this update on our retail revenues will be a decrease of approximately $20.0 million. FERC Proceedings In March 2016, the Federal Energy Regulatory Commission (FERC) approved a settlement reducing our base return on equity (ROE) used in determining our TFR. The settlement results in an ROE of 10.3%, which consists of a 9.8% base ROE plus a 0.5% incentive ROE for participation in an RTO. As of March 31, 2016, we have recorded a regulatory liability of $16.7 million for our estimated refund obligation from the refund effective date of August 20, 2014, through March 31, 2016. In May 2016, our TFR that includes projected 2016 transmission capital expenditures and operating costs was revised to reflect the reduced ROE. The estimated revenue impact for 2016, as compared to 2015, is expected to be an increase of approximately $24.0 million. |
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- Definition The entire disclosure for public utilities. No definition available.
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- References No definition available.
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Financial Instruments and Trading Securities |
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| Financial And Derivative Instruments and Trading Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial And Derivative Instruments And Trading Securities | FINANCIAL INSTRUMENTS AND TRADING SECURITIES Values of Financial 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. In addition, we measure certain investments that do not have a readily determinable fair value at NAV, which are not included in the fair value hierarchy. Further explanation of these levels and NAV is summarized below.
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. 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.
Some of our investments in the Nuclear Decommissioning Trust (NDT) are measured at NAV and do not have readily determinable fair values. These investments 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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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 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. 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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Financial Investments |
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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 that we classify as trading securities in a trust used to fund certain retirement benefit obligations. As of March 31, 2016, and December 31, 2015, we measured the fair value of trust assets at $33.9 million. We include unrealized gains or losses on these securities in investment earnings on our consolidated statements of income. For the three months ended March 31, 2016 and 2015, we recorded unrealized gains of $0.5 million and $0.7 million, respectively, on the assets still held. 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 March 31, 2016, and December 31, 2015. Using the specific identification method to determine cost, we realized a loss on our available-for-sale securities of $1.6 million during the three months ended March 31, 2016, and a gain of $0.2 million during the three months ended March 31, 2015. 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 March 31, 2016, and December 31, 2015.
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 March 31, 2016, and December 31, 2015.
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- Definition 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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Debt Financing |
3 Months Ended |
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Mar. 31, 2016 | |
| Long-term Debt, Unclassified [Abstract] | |
| Debt Financing | DEBT FINANCING In February 2016, KGE, as lessee to the La Cygne Generating Station (La Cygne) sale-leaseback, effected a refunding of $162.1 million in outstanding bonds maturing in March 2021. The stated interest rate of the bonds was reduced from 5.647% to 2.398%. See Note 12, “Variable Interest Entities,” for additional information regarding our La Cygne sale-leaseback. |
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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes |
3 Months Ended |
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Mar. 31, 2016 | |
| Income Tax Disclosure [Abstract] | |
| Taxes | TAXES We recorded income tax expense of $38.6 million with an effective income tax rate of 36% for the three months ended March 31, 2016, and income tax expense of $27.7 million with an effective income tax rate of 34% for the same period of 2015. The increase in the effective income tax rate for the three months ended March 31, 2016, was due primarily to an increase in income before income taxes. As of March 31, 2016, and December 31, 2015, our unrecognized income tax benefits totaled $2.9 million. We do not expect significant changes in our unrecognized income tax benefits in the next 12 months. As of March 31, 2016, and December 31, 2015, we had no amounts accrued for interest related to our unrecognized income tax benefits. We accrued no penalties at either March 31, 2016, or December 31, 2015. As of March 31, 2016, and December 31, 2015, we had recorded $1.5 million for probable assessments of taxes other than income taxes. |
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- References No definition available.
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- Definition 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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Pension and Post-Retirement Benefit Plans |
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| Compensation and Retirement Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pension And Post-Retirement Benefit Plans | PENSION AND POST-RETIREMENT BENEFIT PLANS The following table summarizes the net periodic costs for our pension and post-retirement benefit plans prior to the effects of capitalization.
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During the three months ended March 31, 2016 and 2015, we contributed $6.8 million and $8.5 million, respectively, to the Westar Energy pension trust. |
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- Definition The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Wolf Creek Pension and Post-Retirement Benefit Plans |
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Wolf Creek Pension And Post-Retirement Benefit Plans | WOLF CREEK 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. The following table summarizes the net periodic costs for KGE’s 47% share of the Wolf Creek pension and post-retirement benefit plans prior to the effects of capitalization.
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During the three months ended March 31, 2016 and 2015, we funded $1.6 million and $1.3 million of Wolf Creek’s pension plan contributions, respectively. |
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- Definition 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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Mar. 31, 2016 | |
| Commitments and Contingencies Disclosure [Abstract] | |
| Commitments And Contingencies | COMMITMENTS AND CONTINGENCIES Environmental Matters Cross-State Air Pollution Rule In November 2015, the Environmental Protection Agency (EPA) proposed the Cross-State Air Pollution Update Rule. The proposed rule addresses interstate transport of nitrogen oxides (NOx) emissions in 23 states including Kansas, Missouri and Oklahoma during the ozone season and the impact from the formation of ozone on downwind states with respect to the 2008 ozone National Ambient Air Quality Standards (NAAQS). Starting with the 2017 ozone season, the proposed rule will revise the existing ozone season allowance budgets for Missouri and Oklahoma and will establish an ozone season budget for Kansas. We are currently evaluating the impact of the proposed rule on our operations, and it could have a material impact on our operations and consolidated financial results. National Ambient Air Quality Standards Under the federal Clean Air Act (CAA), the EPA sets NAAQS for certain emissions known as the “criteria pollutants” considered harmful to public health and the environment, including two classes of particulate matter (PM), ozone, NOx (a precursor to ozone), carbon monoxide (CO) and sulfur dioxide (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. In October 2015, the EPA strengthened the ozone NAAQS by lowering the standards from 75 parts per billion (ppb) to 70 ppb. As a result of this change, the EPA is required to make attainment/nonattainment designations for the revised standards by October 2017. We are currently reviewing this final rule and cannot at this time predict the impact it may have on our operations. Nonattainment designations in or surrounding our areas of operations could have a material impact on our consolidated financial results. 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 do not believe this will have a material impact on our operations or consolidated financial results. In 2010, the EPA revised the NAAQS for SO2. In March 2015, a federal court approved a consent decree between the EPA and environmental groups. The decree includes specific SO2 emissions criteria for certain electric generating plants that, if met, requires the EPA to promulgate attainment/nonattainment designations for areas surrounding these plants by July 2016. Tecumseh Energy Center is our only generating station that meets this criteria. In February 2016, the EPA proposed to accept the State of Kansas recommendation to designate the areas surrounding the facility as unclassifiable. We are working with Kansas Department of Health and Environment to determine the impact of this proposed designation. In addition, we continue to communicate with our regulatory agencies regarding these standards and evaluate what impact the revised NAAQS could have on our operations and consolidated financial results. If areas surrounding our facilities are designated in the future as nonattainment and/or we are required to install additional equipment to control emissions at our facilities, it could have a material impact on our operations and consolidated financial results. Greenhouse Gases Burning coal and other fossil fuels releases carbon dioxide (CO2) and other gases referred to as GHG. Various regulations under the federal CAA 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 October 2015, the EPA published a rule establishing new source performance standards that limit CO2 emissions for new, modified and reconstructed coal and natural gas fueled electric generating units to various levels per Megawatt hour depending on various characteristics of the units. In October 2015, the EPA also published a rule establishing guidelines for states to regulate CO2 emissions from existing power plants. The standards for existing plants are known as the Clean Power Plan (CPP). Under the CPP, interim emissions performance rates must be achieved beginning in 2022 and final emissions performance rates must be achieved by 2030. Legal challenges to the CPP were filed by groups of states and industry members, including our company, in the U.S. Court of Appeals for the D.C. Circuit beginning in October 2015, and more challenges are expected. In January 2016, the U.S. Court of Appeals for the D.C. Circuit denied a request to stay the CPP pending review. However, the U.S. Court of Appeals for the D.C. Circuit placed the case on an expedited review schedule with oral arguments scheduled for June 2016. Based on the U.S. Court of Appeals for the D.C. Circuit denial of the petition for stay, state and industry groups petitioned the U.S. Supreme Court for a stay. In February 2016, the U.S. Supreme Court granted the stay request. Due to the future uncertainty of the CPP, we cannot at this time determine the impact on our operations or consolidated financial results, but we believe the costs to comply 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 were issued in November 2015. The final rule establishes limitations or forces the elimination of wastewater associated with coal combustion residual handling. Implementation timelines for these requirements will vary from 2019 to 2023. We are evaluating the final rule at this time and cannot predict the resulting impact on our operations or consolidated financial results, but believe costs to comply could be material. 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 available technology 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 La Cygne 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 June 2015, the EPA along with the U.S. Army Corps of Engineers issued a final rule, effective August 2015, 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 rule depending on regulating authority interpretation, which could impact several permitting programs. Various states have filed lawsuits challenging the rule and, in October 2015, the U.S. Court of Appeals for the Sixth Circuit issued an order that temporarily stays implementation of the rule nationwide pending the outcome of the various legal challenges. We are currently evaluating the final rule. The resulting impact of the rule 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. The EPA published a rule to regulate CCBs in April 2015, which we believe will require additional CCB handling, processing and storage equipment and closure of certain ash disposal areas. While we cannot at this time estimate the full impact and costs associated with future regulations of CCBs, we believe the impact on our operations or consolidated financial results could be material. SPP Revenue Crediting We are a member of the Southwest Power Pool, Inc. (SPP) RTO, which coordinates the operation of a multi-state interconnected transmission system. The SPP has been engaged in a process whereby it is seeking to allocate revenue credits under its Open Access Transmission Tariff to sponsors of certain transmission system upgrades. Qualifying upgrades are those that are not financed through general rates paid by all customers and that result in additional revenue to the SPP. The SPP is also evaluating whether sponsors are entitled to revenue credits for previously completed upgrades, and whether members will be obligated to pay for revenue credits attributable to these historical upgrades. We believe it is reasonably possible that we will be required to pay sponsors for revenue credits attributable to historical upgrades. However, due to the complexity of the process, including the large number of transmission service requests associated with the upgrades at issue, the number of years included in the process and complexity surrounding the manner in which revenue credits are allocated, we are unable to estimate an amount, or a range of amounts, we may owe, or the impact on our consolidated financial results. We believe any amounts we may owe would be recovered in our future prices. Storage of Spent Nuclear Fuel In 2010, the Department of Energy (DOE) filed a motion with the Nuclear Regulatory Commission (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. The NRC has not yet issued its decision. Wolf Creek is currently evaluating alternatives for expanding its existing on-site spent nuclear fuel storage to provide additional capacity prior to 2025. We cannot predict when, or if, an off-site storage site or alternative disposal site will be available to receive Wolf Creek’s spent nuclear fuel and will continue to monitor this activity. FERC Proceedings See Note 3, “Rate Matters and Regulation - FERC Proceedings,” for information regarding a settlement of a complaint that was filed by the KCC against us with the FERC under Section 206 of the Federal Power Act. |
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- References No definition available.
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- Definition The entire disclosure for commitments and contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Legal Proceedings |
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Mar. 31, 2016 | |
| 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 10, “Commitments and Contingencies,” for additional information. |
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- Definition LEGAL PROCEEDINGS [Abstract] No definition available.
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- Definition Open legal proceedings in the normal course of business, including product liability and other litigation and contingencies. No definition available.
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Variable Interest Entities |
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| Variable Interest Entities | 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. The primary beneficiary of a VIE is required to consolidate the VIE. The trusts holding our 8% interest in Jeffrey Energy Center (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 and (2) our ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount. 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. In February 2016, KGE effected a refunding of the $162.1 million in outstanding bonds maturing March 2021. See Note 6, “Debt Financing,” for additional information. 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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- Definition Schedule Of Variable Interest Entities [Abstract] No definition available.
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- Definition Variable Interest Entities Disclosure [Text Block] No definition available.
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Summary Of Significant Accounting Policies (Policy) |
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| New Accounting Pronouncements, Policy [Policy Text Block] | 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, the Financial Accounting Standards Board (FASB) issued the following new accounting pronouncements which may affect our accounting and/or disclosure. Leases In February 2016, the FASB issued Accounting Standard Update (ASU) No. 2016-02 which requires lessees to recognize right-of-use assets and lease liabilities, initially measured at present value of the lease payments, on its balance sheet for leases with terms longer than 12 months. Leases are to be classified as either financing or operating leases, with that classification affecting the pattern of expense recognition in the income statement. Accounting for leases by lessors is largely unchanged. The guidance is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The guidance requires a modified retrospective approach for all leases existing at the earliest period presented, or entered into by the date of initial adoption, with certain practical expedients permitted. We are evaluating the guidance and have not yet determined the impact on our consolidated financial statements. Stock-based Compensation In March 2016, the FASB issued ASU No. 2016-09 as part of its simplification initiative. The areas for simplification involve several aspects of the accounting for stock-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2016, with early adoption permitted. We have elected to adopt effective January 1, 2016. Under current GAAP, if the tax deduction for a stock-based payment award exceeds the compensation cost recorded for financial reporting, the additional tax benefit is recognized in additional paid-in capital and referred to as an excess tax benefit. Tax deficiencies were recognized either as an offset to the accumulated excess tax benefits, if any, or as reduction of income. The issuance of this ASU reflects the FASB’s decision that all prospective excess tax benefits and tax deficiencies should be recognized as income tax benefits and expense. Upon initial adoption, we recorded a $3.3 million cumulative effect adjustment to retained earnings for excess tax benefits that had not previously been recognized. Further, the issuance of this ASU reflects the FASB’s decision that cash flows related to excess tax benefits should be classified as cash flows from operating activities on the consolidated statements of cash flows. Upon adoption, we have retrospectively presented cash flows from operating activities and cash flows used in financing activities on the accompanying condensed consolidated statements of cash flows for the three months ended March 31, 2015, as $1.1 million higher than as previously reported. Financial Instruments In May 2015, the FASB issued ASU No. 2015-07, which removes the requirement to categorize certain investments measured at net asset value (NAV) per share within the fair value hierarchy. The guidance is effective for fiscal years beginning after December 15, 2015. We have adopted this guidance as of January 1, 2016. The adoption was limited to disclosure and does not have a material impact on our consolidated financial statements. See Note 4 “Financial Instruments and Trading Securities.” |
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| Principles Of Consolidation | Principles of Consolidation We prepare our unaudited condensed consolidated financial statements in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements presented in accordance with generally accepted accounting principles (GAAP) for the United States of America have been condensed or omitted. Our condensed 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. In our opinion, all adjustments, consisting only of normal recurring adjustments considered necessary for a fair presentation of the consolidated financial statements, have been included. |
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| Use Of Management's Estimates | Use of Management’s Estimates When we prepare our condensed 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 condensed 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 including the decommissioning of Wolf Creek, environmental issues, VIEs, contingencies and litigation. Actual results may differ from those estimates under different assumptions or conditions. |
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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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| Allowance For Funds Used During Construction | Allowance for Funds Used During Construction 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 |
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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 issuable common shares resulting from our forward sale agreements, if any, and RSUs with forfeitable rights to dividend equivalents. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. |
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| Supplemental Cash Flow Information | Supplemental Cash Flow Information
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- References No definition available.
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- Definition 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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- Definition 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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- Definition 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 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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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. No definition available.
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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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Summary Of Significant Accounting Policies (Tables) |
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Utility Inventory | Following are the balances for fuel inventory and supplies stated separately.
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| Allowance For Funds Used During Construction | on the accompanying consolidated statements of income as follows:
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| Reconciliation Of Basic And Diluted EPS | The following table reconciles our basic and diluted EPS from net income.
_______________ (a)We had no antidilutive securities for the three months ended March 31, 2016 and 2015. |
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| Supplemental Cash Flow Information |
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- References No definition available.
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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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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- Definition Tabular disclosure of all information related to inventories for utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of an entity's allowance for funds used during construction. No definition available.
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Financial Instruments and Trading Securities (Tables) |
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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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unrealized Gains And Losses On Fair Value Assets And Liabilities | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investments In Financial Instruments | The following table provides additional information on these investments.
_______________
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| X | ||||||||||
- 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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- 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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- 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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- Definition Financial And Derivative Instruments and Trading Securities [Abstract] No definition available.
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- Definition Schedule of Carrying Value and Fair Values of Financial Instruments. No definition available.
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| X | ||||||||||
- 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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| Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cost And Fair Value Of Investments | The following table presents the cost, gross unrealized gains and losses, fair value and allocation of investments in the NDT fund as of March 31, 2016, and December 31, 2015.
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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 March 31, 2016, and December 31, 2015.
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- References No definition available.
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| X | ||||||||||
- 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 | ||||||||||
- 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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Pension and Post-Retirement Benefit Plans (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following table summarizes the net periodic costs for our pension and post-retirement benefit plans prior to the effects of capitalization.
_______________
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Wolf Creek Pension and Post-Retirement Benefit Plans (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Wolf Creek Pension And Post-Retirement Benefit Plans [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following table summarizes the net periodic costs for our pension and post-retirement benefit plans prior to the effects of capitalization.
_______________
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| Wolf Creek [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Wolf Creek Pension And Post-Retirement Benefit Plans [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following table summarizes the net periodic costs for KGE’s 47% share of the Wolf Creek pension and post-retirement benefit plans prior to the effects of capitalization.
_______________
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| X | ||||||||||
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Wolf Creek Interim Pension And Post-Retirement Benefit Disclosure [Line Items] No definition available.
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| X | ||||||||||
- Details
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Variable Interest Entities (Tables) |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2016 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Variable Interest Entities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets And Liabilities of 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 | ||||||||||
- 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 | ||||||||||
- Definition Schedule Of Variable Interest Entities [Abstract] No definition available.
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Description Of Business (Details) |
3 Months Ended |
|---|---|
Mar. 31, 2016 | |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of customers in Kansas | 702,000 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number Of Customers Getting Electric Generation, Transmission And Distribution Services No definition available.
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Summary Of Significant Accounting Policies (Fuel Inventory And Supplies) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Public Utilities, Inventory [Line Items] | ||
| Total | $ 301,340 | $ 301,294 |
| Fuel Inventory [Member] | ||
| Public Utilities, Inventory [Line Items] | ||
| Public Utilities Inventory | 113,965 | 113,438 |
| Supplies [Member] | ||
| Public Utilities, Inventory [Line Items] | ||
| Public Utilities Inventory | $ 187,375 | $ 187,856 |
| 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 | ||||||||||
- 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 | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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Summary Of Significant Accounting Policies (Allowance For Funds Used During Construction) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
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| Accounting Policies [Abstract] | ||
| Borrowed funds | $ (2,008) | $ (2,029) |
| Equity funds | 2,464 | 1,950 |
| Total | $ 4,472 | $ 3,979 |
| Average AFUDC rates | 5.20% | 4.00% |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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 | ||||||||||
- 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
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| X | ||||||||||
- Definition Amount capitalized of allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- 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 (Reconciliation Of Basic And Diluted EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
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| Accounting Policies [Abstract] | ||
| Net Income Allocated to RSUs | $ 135 | $ 118 |
| Net income allocated to common stock | $ 65,450 | $ 50,862 |
| Weighted Average Number of Shares Outstanding , Basic | 141,992,846 | 132,395,497 |
| RSUs | 318,382 | 175,876 |
| Forward sale agreements | 0 | 2,968,258 |
| Weighted average equivalent common shares outstanding - diluted | 142,311,228 | 135,539,631 |
| Earnings Per Share, Basic | $ 0.46 | $ 0.38 |
| Earnings Per Share, Diluted | $ 0.46 | $ 0.38 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities | 0 | |
| X | ||||||||||
- References No definition available.
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| 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
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| 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
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| 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
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| 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
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| 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
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| 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
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| 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
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| X | ||||||||||
- Definition Earnings distributed and earnings allocated to common stock under the two-class method. No definition available.
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| 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.
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Summary Of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Cash Paid For (Received From) | ||
| Interest on financing activities | $ 30,415 | $ 38,927 |
| Income Taxes Paid, Net | (383) | 0 |
| Noncash Investing and Financing Transactions | ||
| Property, plant and equipment | 130,532 | 63,265 |
| Issuance of common stock for reinvested dividends and compensation plans | 2,405 | 3,028 |
| Assets acquired through capital leases | 180 | 294 |
| Variable Interest Entity, Primary Beneficiary [Member] | ||
| Cash Paid For (Received From) | ||
| Interest on financing activities | $ 4,150 | $ 5,651 |
| 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
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| 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
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| X | ||||||||||
- Definition The amount of cash paid for interest during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| 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 | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Details
|
Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2015 |
Mar. 31, 2016 |
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||
| New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 3,326 | |
| Excess Tax Benefit from Share-based Compensation | $ 1,073 | |
| Retained Earnings [Member] | ||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||
| New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 3,326 |
| X | ||||||||||
- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Excess Tax Benefit from Share-based Compensation No definition available.
|
| X | ||||||||||
- Details
|
Rate Matters And Regulation (Narrative) (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
May. 02, 2016 |
Mar. 31, 2016 |
Jan. 31, 2016 |
Mar. 31, 2016 |
|
| FERC 206 [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Approved Return on Equity, Percentage | 10.30% | |||
| Loss Contingency Accrual | $ 16.7 | $ 16.7 | ||
| FERC 206 [Member] | Subsequent Event [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Requested Rate Increase (Decrease), Amount | $ 24.0 | |||
| Kansas Corporation Commission [Member] | Electric Transmission [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ 25.3 | |||
| Kansas Corporation Commission [Member] | Electric Transmission [Member] | Subsequent Event [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Requested Rate Increase (Decrease), Amount | $ 20.0 | |||
| Kansas Corporation Commission [Member] | Ad Valorem Tax [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ 5.0 | |||
| Incentive Return on Equity [Member] | FERC 206 [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Approved Return on Equity, Percentage | 0.00% | |||
| Base Return on Equity [Member] | FERC 206 [Member] | ||||
| Regulatory Proceedings [Line Items] | ||||
| Public Utilities, Approved Return on Equity, Percentage | 9.80% | |||
| X | ||||||||||
- Definition Amount of loss contingency liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. No definition available.
|
| X | ||||||||||
- Definition Percentage of public utility's approved return on equity. No definition available.
|
| X | ||||||||||
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. No definition available.
|
| X | ||||||||||
- Definition Regulatory Proceedings [Line Items] No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Financial Instruments and Trading Securities (Carrying Values And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Fixed Rate Debt Member | ||
| Debt Instrument [Line Items] | ||
| Carrying Value | $ 3,080,000 | $ 3,080,000 |
| Fair Value | 3,386,212 | 3,259,533 |
| Fixed Rate Debt Of Variable Interest Entities Member | ||
| Debt Instrument [Line Items] | ||
| Carrying Value | 137,963 | 166,271 |
| Fair Value | $ 152,155 | $ 179,030 |
| 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 | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Financial Instruments and Trading Securities (Fair Value Of Assets And Liabilities) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | $ 183,455 | $ 184,057 |
| Trading securities | 33,910 | 33,888 |
| Total assets measured at fair value | 217,365 | 217,945 |
| Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 26 | 87 |
| Trading securities | 156 | 159 |
| Total assets measured at fair value | 182 | 246 |
| Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 142,088 | 150,658 |
| Trading securities | 33,754 | 33,729 |
| Total assets measured at fair value | 175,842 | 184,387 |
| Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Total assets measured at fair value | 0 | 0 |
| Domestic Equity Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 52,143 | 56,922 |
| Trading securities | 17,776 | 17,876 |
| Domestic Equity Funds [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Domestic Equity Funds [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 46,313 | 50,872 |
| Trading securities | 17,776 | 17,876 |
| Domestic Equity Funds [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| International Equity Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 31,846 | 33,595 |
| Trading securities | 4,321 | 4,430 |
| International Equity Funds [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| International Equity Funds [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 31,846 | 33,595 |
| Trading securities | 4,321 | 4,430 |
| International Equity Funds [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Core Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 24,650 | 25,976 |
| Trading securities | 11,657 | 11,423 |
| Core Bonds Fund [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Core Bonds Fund [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 24,650 | 25,976 |
| Trading securities | 11,657 | 11,423 |
| Core Bonds Fund [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| High-Yield Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 14,493 | 15,288 |
| High-Yield Bonds Fund [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| High-Yield Bonds Fund [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 14,493 | 15,288 |
| High-Yield Bonds Fund [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Emerging Market Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 13,715 | 13,584 |
| Emerging Market Bonds Fund [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Emerging Market Bonds Fund [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 13,715 | 13,584 |
| Emerging Market Bonds Fund [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Combination Debt Equity And Other Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 11,071 | 11,343 |
| Combination Debt Equity And Other Fund [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Combination Debt Equity And Other Fund [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 11,071 | 11,343 |
| Combination Debt Equity And Other Fund [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Alternative Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 14,862 | 16,439 |
| Alternative Funds [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Alternative Funds [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Alternative Funds [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Real Estate Securities Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 20,649 | 10,823 |
| Real Estate Securities Fund [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Real Estate Securities Fund [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Real Estate Securities Fund [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Cash Equivalents [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 26 | 87 |
| Trading securities | 156 | 159 |
| Cash Equivalents [Member] | Level 1 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 26 | 87 |
| Trading securities | 156 | 159 |
| Cash Equivalents [Member] | Level 2 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Cash Equivalents [Member] | Level 3 [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 41,341 | 33,312 |
| Trading securities | 0 | 0 |
| Total assets measured at fair value | 41,341 | 33,312 |
| Fair Value, Inputs, Net Asset Value [Member] | Domestic Equity Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 5,830 | 6,050 |
| Trading securities | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | International Equity Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | Core Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | High-Yield Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | Emerging Market Bonds Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | Combination Debt Equity And Other Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Fair Value, Inputs, Net Asset Value [Member] | Alternative Funds [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 14,862 | 16,439 |
| Fair Value, Inputs, Net Asset Value [Member] | Real Estate Securities Fund [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 20,649 | 10,823 |
| Fair Value, Inputs, Net Asset Value [Member] | Cash Equivalents [Member] | ||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
| Trading securities | $ 0 | $ 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 | ||||||||||
- Definition Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
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| X | ||||||||||
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Financial Instruments and Trading Securities (Unrealized Gains And Losses On Financial Statements) (Details) - Decommissioning Trust Assets [Member] - Fair Value [Member] - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2016 |
Dec. 31, 2015 |
|||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 3,829 | $ 1,948 | ||
| Domestic Equity Funds [Member] | ||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 3,829 | 1,948 | ||
| Alternative Funds [Member] | ||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [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, Notice Period | 65 days | |||
| Real Estate Securities Fund [Member] | ||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | [1] | $ 0 | $ 0 | |
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 65 days | |||
| ||||
| 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
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Financial Instruments and Trading Securities (Investments In Financial Instruments) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2016 |
Dec. 31, 2015 |
||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction Period | 15 years | ||||
| Nuclear decommissioning trust assets | $ 183,455 | $ 184,057 | |||
| Trading securities | 33,910 | 33,888 | |||
| Total | 217,365 | 217,945 | |||
| Domestic Equity Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 52,143 | 56,922 | |||
| Trading securities | 17,776 | 17,876 | |||
| Alternative Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 14,862 | 16,439 | |||
| Real Estate Securities Fund [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 20,649 | 10,823 | |||
| Fair Value [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 41,341 | 33,312 | |||
| Fair Value [Member] | Domestic Equity Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 5,830 | 6,050 | |||
| Fair Value [Member] | Alternative Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | 14,862 | 16,439 | |||
| Fair Value [Member] | Real Estate Securities Fund [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Nuclear decommissioning trust assets | [1] | 20,649 | 10,823 | ||
| Decommissioning Trust Assets [Member] | Fair Value [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 3,829 | 1,948 | |||
| Decommissioning Trust Assets [Member] | Fair Value [Member] | Domestic Equity Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 3,829 | 1,948 | |||
| Decommissioning Trust Assets [Member] | Fair Value [Member] | Alternative Funds [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [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, Notice Period | 65 days | ||||
| Decommissioning Trust Assets [Member] | Fair Value [Member] | Real Estate Securities Fund [Member] | |||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | |||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | [1] | $ 0 | $ 0 | ||
| Investment redemption frequency | Quarterly | ||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period | 65 days | ||||
| |||||
| 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 | ||||||||||
- Definition Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] No definition available.
|
| X | ||||||||||
- Details
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Financial Investments (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
|
| Schedule of Available-for-sale Securities [Line Items] | |||
| Trading Securities | $ 33,910 | $ 33,888 | |
| Unrealized gains losses | 500 | $ 700 | |
| Realized gains on available-for-sale-securities | $ 1,600 | $ 200 | |
| 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| 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 Investments) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
Mar. 31, 2015 |
|---|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 175,529 | $ 177,048 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 11,814 | $ 13,351 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,888 | 6,342 | |
| Available-for-sale Securities | $ 183,455 | $ 184,057 | |
| Allocation | 100.00% | 100.00% | |
| Domestic Equity Funds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 45,147 | $ 49,488 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 7,099 | 7,436 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 103 | 2 | |
| Available-for-sale Securities | $ 52,143 | $ 56,922 | |
| Allocation | 28.00% | 32.00% | |
| International Equity Funds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 31,101 | $ 33,458 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,553 | 1,372 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 808 | 1,235 | |
| Available-for-sale Securities | $ 31,846 | $ 33,595 | |
| Allocation | 17.00% | 18.00% | |
| Core Bonds Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 24,459 | $ 26,397 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 191 | 0 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 421 | |
| Available-for-sale Securities | $ 24,650 | $ 25,976 | |
| Allocation | 13.00% | 14.00% | |
| High-Yield Bonds Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 15,941 | $ 17,047 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,448 | 1,759 | |
| Available-for-sale Securities | $ 14,493 | $ 15,288 | |
| Allocation | 9.00% | 8.00% | |
| Emerging Market Bonds Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 15,106 | $ 16,306 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,391 | 2,722 | |
| Available-for-sale Securities | $ 13,715 | $ 13,584 | |
| Allocation | 7.00% | 7.00% | |
| Combination Debt Equity And Other Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 8,113 | $ 8,239 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,958 | 3,104 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 | |
| Available-for-sale Securities | $ 11,071 | $ 11,343 | |
| Allocation | 6.00% | 6.00% | |
| Alternative Funds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 15,000 | $ 15,000 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1,439 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 138 | 0 | |
| Available-for-sale Securities | $ 14,862 | $ 16,439 | |
| Allocation | 9.00% | 9.00% | |
| Real Estate Securities Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 20,636 | $ 11,026 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 13 | 0 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 203 | |
| Available-for-sale Securities | $ 20,649 | $ 10,823 | |
| Allocation | 11.00% | 6.00% | |
| Cash Equivalents [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Available-for-sale Securities, Amortized Cost Basis | $ 26 | $ 87 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0 | |
| Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | $ 0 | |
| Available-for-sale Securities | $ 26 | $ 87 |
| 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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. 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
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Available-for-sale Securities, Security Type Allocation Percentage No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
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| X | ||||||||||
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Financial Investments (Fair Value And The Gross Unrealized Losses Of the Available-For-Sale Securities) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
|
| Schedule of Available-for-sale Securities [Line Items] | |||
| Trading Securities, Change in Unrealized Holding Gain (Loss) | $ 500 | $ 700 | |
| Fair Value, Less than 12 Months | 29,355 | $ 41,264 | |
| Gross Unrealized Losses, Less than 12 Months | (1,586) | (2,180) | |
| Fair Value, 12 Months or Greater | 20,974 | 31,792 | |
| Gross Unrealized Losses, 12 Months or Greater | (2,302) | (4,162) | |
| Fair Value, Total | 50,329 | 73,056 | |
| Gross Unrealized Losses, Total | (3,888) | (6,342) | |
| Domestic Equity Funds [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 | 668 | 668 | |
| Gross Unrealized Losses, 12 Months or Greater | (103) | (2) | |
| Fair Value, Total | 668 | 668 | |
| Gross Unrealized Losses, Total | (103) | (2) | |
| International Equity Funds [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 | 6,591 | 6,717 | |
| Gross Unrealized Losses, 12 Months or Greater | (808) | (1,235) | |
| Fair Value, Total | 6,591 | 6,717 | |
| Gross Unrealized Losses, Total | (808) | (1,235) | |
| Core Bonds Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Fair Value, Less than 12 Months | 25,976 | ||
| Gross Unrealized Losses, Less than 12 Months | (421) | ||
| Fair Value, 12 Months or Greater | 0 | ||
| Gross Unrealized Losses, 12 Months or Greater | 0 | ||
| Fair Value, Total | 25,976 | ||
| Gross Unrealized Losses, Total | (421) | ||
| Emerging Market Bonds Fund [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 | 13,715 | 13,584 | |
| Gross Unrealized Losses, 12 Months or Greater | (1,391) | (2,722) | |
| Fair Value, Total | 13,715 | 13,584 | |
| Gross Unrealized Losses, Total | (1,391) | (2,722) | |
| High-Yield Bonds Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Fair Value, Less than 12 Months | 14,493 | 15,288 | |
| Gross Unrealized Losses, Less than 12 Months | (1,448) | (1,759) | |
| Fair Value, 12 Months or Greater | 0 | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | 0 | |
| Fair Value, Total | 14,493 | 15,288 | |
| Gross Unrealized Losses, Total | (1,448) | (1,759) | |
| Alternative Funds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Fair Value, Less than 12 Months | 14,862 | ||
| Gross Unrealized Losses, Less than 12 Months | (138) | ||
| Fair Value, 12 Months or Greater | 0 | ||
| Gross Unrealized Losses, 12 Months or Greater | 0 | ||
| Fair Value, Total | 14,862 | ||
| Gross Unrealized Losses, Total | $ (138) | ||
| Real Estate Securities Fund [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Fair Value, Less than 12 Months | 0 | ||
| Gross Unrealized Losses, Less than 12 Months | 0 | ||
| Fair Value, 12 Months or Greater | 10,823 | ||
| Gross Unrealized Losses, 12 Months or Greater | (203) | ||
| Fair Value, Total | 10,823 | ||
| Gross Unrealized Losses, Total | $ (203) | ||
| 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 | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| 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
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| X | ||||||||||
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Debt Financing (Narrative) (Details) - Debt Instrument La Cygne [Member] [Domain] [Domain] - KGE Member [Domain] $ in Thousands |
Feb. 16, 2016
USD ($)
|
|---|---|
| La Cygne Generating Station [Member] | |
| Debt Instrument [Line Items] | |
| Long-term Debt, Gross | $ 162,100 |
| Variable Interest Entity, Primary Beneficiary [Member] | |
| Debt Instrument [Line Items] | |
| Debt Instrument, Interest Rate, Stated Percentage | 5.647% |
| debt instrument, interest rate, refunded stated percentage | 2.398% |
| 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 | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition debt instrument, interest rate, refunded stated percentage No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
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Taxes Taxes (Narrative) (Details) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Dec. 31, 2015 |
|
| Income Tax Contingency [Line Items] | |||
| Income tax expense | $ 38,622,000 | $ 27,678,000 | |
| Effective income tax rate | 36.00% | 34.00% | |
| Liability for unrecognized income tax benefits | $ 2,900,000 | ||
| Interest on liability related to unrecognized income tax benefits | 0 | ||
| Penalties accrued for unrecognized income tax benefits | 0 | ||
| Accrual for taxes other than income taxes | $ 1,500,000 | ||
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| 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 | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| 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 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 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 interest expense accrued for an underpayment of income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Pension and Post-Retirement Benefit Plans (Net Periodic Costs And Pension Contributions) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
||||
| Components of Net Periodic Cost (Benefit): | |||||
| Pension Contributions | $ 6,800 | $ 8,500 | |||
| Pension Benefits [Member] | |||||
| Components of Net Periodic Cost (Benefit): | |||||
| Service cost | 4,664 | 5,348 | |||
| Interest cost | 10,959 | 10,753 | |||
| Expected return on plan assets | (10,663) | (10,059) | |||
| Prior service costs | 246 | 130 | |||
| Actuarial loss, net | 5,388 | 7,661 | |||
| Net periodic cost before regulatory adjustment | 10,594 | 13,833 | |||
| Regulatory adjustment | [1] | (3,306) | (1,797) | ||
| Net periodic cost | 13,900 | 15,630 | |||
| Post-Retirement Benefits [Member] | |||||
| Components of Net Periodic Cost (Benefit): | |||||
| Service cost | 271 | 361 | |||
| Interest cost | 1,393 | 1,422 | |||
| Expected return on plan assets | (1,709) | (1,654) | |||
| Prior service costs | 114 | 114 | |||
| Actuarial loss, net | (280) | 95 | |||
| Net periodic cost before regulatory adjustment | (211) | 338 | |||
| Regulatory adjustment | [1] | (486) | (1,013) | ||
| Net periodic cost | $ (697) | $ 1,351 | |||
| |||||
| 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 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 | ||||||||||
- References No definition available.
|
| 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 The amount of cash or cash equivalents contributed by the entity to fund its pension plans. 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 prior to regulatory adjustment. No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plan Regulatory Adjustment No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Wolf Creek Pension and Post-Retirement Benefit Plans Wolf Creek Pension and Post-Retirement Benefit Plans (Net Periodic Costs and Pension Contributions) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Pension Contributions | $ 6,800 | $ 8,500 | |||||
| Wolf Creek [Member] | |||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Pension Contributions | $ 1,600 | 1,300 | |||||
| KGE [Member] | |||||||
| Subsidiary Interest in Defined Benefit Plans | 47.00% | ||||||
| Pension Benefits [Member] | |||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Service cost | $ 4,664 | 5,348 | |||||
| Interest cost | 10,959 | 10,753 | |||||
| Expected return on plan assets | (10,663) | (10,059) | |||||
| Prior service costs | 246 | 130 | |||||
| Actuarial loss, net | 5,388 | 7,661 | |||||
| Net periodic cost before regulatory adjustment | 10,594 | 13,833 | |||||
| Regulatory adjustment | [1] | (3,306) | (1,797) | ||||
| Net periodic cost | 13,900 | 15,630 | |||||
| Pension Benefits [Member] | Wolf Creek [Member] | |||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Service cost | 1,687 | 1,899 | |||||
| Interest cost | 2,414 | 2,254 | |||||
| Expected return on plan assets | (2,431) | (2,261) | |||||
| Prior service costs | 14 | 14 | |||||
| Actuarial loss, net | 1,089 | 1,482 | |||||
| Net periodic cost before regulatory adjustment | 2,773 | 3,388 | |||||
| Regulatory adjustment | [2] | (483) | (304) | ||||
| Net periodic cost | 3,256 | 3,084 | |||||
| Post-Retirement Benefits [Member] | |||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Service cost | 271 | 361 | |||||
| Interest cost | 1,393 | 1,422 | |||||
| Expected return on plan assets | (1,709) | (1,654) | |||||
| Prior service costs | 114 | 114 | |||||
| Actuarial loss, net | (280) | 95 | |||||
| Net periodic cost before regulatory adjustment | (211) | 338 | |||||
| Regulatory adjustment | [1] | (486) | (1,013) | ||||
| Net periodic cost | (697) | 1,351 | |||||
| Post-Retirement Benefits [Member] | Wolf Creek [Member] | |||||||
| Components of Net Periodic Cost (Benefit): | |||||||
| Service cost | 32 | 34 | |||||
| Interest cost | 81 | 79 | |||||
| Expected return on plan assets | 0 | 0 | |||||
| Prior service costs | 0 | 0 | |||||
| Actuarial loss, net | (4) | 1 | |||||
| Net periodic cost before regulatory adjustment | 109 | 114 | |||||
| Regulatory adjustment | [2] | 0 | 0 | ||||
| Net periodic cost | $ 109 | $ 114 | |||||
| |||||||
| 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 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 | ||||||||||
- References No definition available.
|
| 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 The amount of cash or cash equivalents contributed by the entity to fund its pension plans. 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 prior to regulatory adjustment. No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plan Regulatory Adjustment No definition available.
|
| X | ||||||||||
- Definition Subsidiary's interest in defined benefit plans. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
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Mar. 31, 2016 |
Feb. 16, 2016 |
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| Jeffrey Energy Center [Member] | ||
| Variable Interest Entity [Line Items] | ||
| Variable interest entity percentage of asset held | 8.00% | |
| Agreement expiration date | Jan. 01, 2019 | |
| La Cygne Generating Station [Member] | ||
| Variable Interest Entity [Line Items] | ||
| Variable interest entity percentage of asset held | 50.00% | |
| Agreement expiration date | Sep. 01, 2029 | |
| KGE Member [Domain] | Debt Instrument La Cygne [Member] [Domain] [Domain] | La Cygne Generating Station [Member] | ||
| Variable Interest Entity [Line Items] | ||
| Long-term Debt, Gross | $ 162,100 |
| 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
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
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Variable Interest Entities (Assets And Liabilities In Relation To VIEs) (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
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| Variable Interest Entity [Line Items] | |||||||
| Property, plant and equipment, net | $ 8,675,925 | $ 8,524,902 | |||||
| Current maturities of long-term debt | 125,000 | 0 | |||||
| Accrued interest | [1] | 86,222 | 71,426 | ||||
| Long-term debt, net | 3,039,239 | 3,163,950 | |||||
| Variable Interest Entity, Primary Beneficiary [Member] | |||||||
| Variable Interest Entity [Line Items] | |||||||
| Property, plant and equipment, net | 265,655 | 268,239 | |||||
| Regulatory assets | [2] | 9,428 | 9,088 | ||||
| Current maturities of long-term debt | 26,842 | 28,309 | |||||
| Accrued interest | [1] | 19 | 2,457 | ||||
| Long-term debt, net | $ 111,239 | $ 138,097 | |||||
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| 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
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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 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 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
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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