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Document and Entity Information Document
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9 Months Ended | |
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Sep. 30, 2013
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Oct. 30, 2013
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| Entity Information [Line Items] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Sep. 30, 2013 | |
| Document Fiscal Year Focus | 2013 | |
| Document Fiscal Period Focus | Q3 | |
| 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 | 127,154,166 |
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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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- Details
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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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- Details
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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 of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- Details
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- Definition
Amount of obligation due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- 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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- Details
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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 carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- 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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Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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| Allowance for doubtful accounts | $ 3,073 | $ 4,916 |
| Common stock, par value | $ 5 | $ 5 |
| Common stock, shares authorized | 275,000,000 | 275,000,000 |
| Common stock, shares issued | 127,064,039 | 126,503,748 |
| Common stock, shares outstanding | 127,064,039 | 126,503,748 |
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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Consolidated Statements Of Income (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| REVENUES | $ 694,974 | $ 695,758 | $ 1,810,776 | $ 1,737,698 |
| OPERATING EXPENSES: | ||||
| Fuel and purchased power | 178,562 | 177,506 | 483,014 | 452,840 |
| Operating and maintenance | 169,100 | 149,001 | 491,132 | 461,515 |
| Depreciation and amortization | 68,861 | 65,061 | 203,305 | 204,640 |
| Selling, general and administrative | 54,245 | 54,300 | 157,668 | 164,346 |
| Total Operating Expenses | 470,768 | 445,868 | 1,335,119 | 1,283,341 |
| INCOME FROM OPERATIONS | 224,206 | 249,890 | 475,657 | 454,357 |
| OTHER INCOME (EXPENSE): | ||||
| Investment earnings (losses) | 2,863 | 2,729 | 8,612 | 6,456 |
| Other income | 12,321 | 6,115 | 29,748 | 27,242 |
| Other expense | (6,195) | (6,278) | (13,911) | (14,246) |
| Total Other Income | 8,989 | 2,566 | 24,449 | 19,452 |
| Interest expense | 45,708 | 45,017 | 135,790 | 131,886 |
| INCOME BEFORE INCOME TAXES | 187,487 | 207,439 | 364,316 | 341,923 |
| Income tax expense | 52,392 | 66,372 | 106,514 | 107,156 |
| NET INCOME | 135,095 | 141,067 | 257,802 | 234,767 |
| Less: Net income attributable to noncontrolling interests | 1,970 | 1,786 | 6,344 | 5,228 |
| NET INCOME ATTRIBUTABLE TO WESTAR ENERGY, INC. | 133,125 | 139,281 | 251,458 | 229,539 |
| Preferred dividends | 0 | 0 | 0 | 1,616 |
| NET INCOME ATTRIBUTABLE TO COMMON STOCK | $ 227,923 | |||
| Earnings Per Share [Abstract] | ||||
| Earnings Per Share, Basic | $ 1.04 | $ 1.10 | $ 1.97 | $ 1.79 |
| Earnings Per Share, Diluted | $ 1.04 | $ 1.09 | $ 1.96 | $ 1.79 |
| AVERAGE EQUIVALENT COMMON SHARES OUTSTANDING | ||||
| Weighted Average Number of Shares Outstanding , Basic | 127,444,792 | 126,783,248 | 127,318,462 | 126,638,992 |
| Weighted Average Number of Shares Outstanding, Diluted | 128,111,472 | 127,134,524 | 127,851,477 | 126,855,386 |
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.34 | $ 0.33 | $ 1.02 | $ 0.99 |
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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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- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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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- 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
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition
The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- 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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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Fuel and purchased power expense incurred that are directly related to goods produced and sold. No definition available.
|
|
Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | ||
| Net income | $ 257,802 | $ 234,767 |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 203,305 | 204,640 |
| Amortization of nuclear fuel | 15,270 | 16,658 |
| Amortization of deferred regulatory gain from sale leaseback | (4,121) | (4,121) |
| Amortization of corporate-owned life insurance | 10,442 | 17,062 |
| Non-cash compensation | 6,148 | 5,482 |
| Net deferred income taxes and credits | 107,709 | 106,730 |
| Stock-based compensation excess tax benefits | (502) | (1,628) |
| Allowance for equity funds used during construction | (9,473) | (9,096) |
| Changes in working capital items: | ||
| Accounts receivable | (42,400) | (40,740) |
| Fuel inventory and supplies | 13,842 | (19,634) |
| Prepaid expenses and other | 2,992 | 14,680 |
| Accounts payable | 2,088 | (7,201) |
| Accrued taxes | 44,573 | 40,825 |
| Other current liabilities | (53,042) | (88,402) |
| Changes in other assets | (22,682) | (1,061) |
| Changes in other liabilities | 21,159 | (15,005) |
| Cash Flows from Operating Activities | 553,110 | 453,956 |
| CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: | ||
| Additions to property, plant and equipment | (557,988) | (598,426) |
| Purchase of securities - trusts | (61,495) | (18,684) |
| Sale of securities - trusts | 76,906 | 19,808 |
| Investment in corporate-owned life insurance | 17,724 | 18,404 |
| Proceeds from investment in corporate-owned life insurance | 147,591 | 16,501 |
| Proceeds from federal grant | 876 | 4,470 |
| Investment in affiliated company | (2,694) | (6,550) |
| Other investing activities | (2,886) | (30) |
| Cash Flows used in Investing Activities | (417,414) | (601,315) |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Short-term debt, net | (287,741) | (71,544) |
| Proceeds from long-term debt | 492,572 | 541,374 |
| Retirements of long-term debt | (100,000) | (220,563) |
| Repayment of capital leases | (2,262) | (1,984) |
| Borrowings against cash surrender value of corporate-owned life insurance | 57,948 | 64,479 |
| Repayment of borrowings against cash surrender value of corporate-owned life insurance | (145,418) | (18,369) |
| Stock-based compensation excess tax benefits | 502 | 1,628 |
| Preferred stock redemption | 0 | (22,567) |
| Issuance of common stock | 4,526 | 5,348 |
| Distributions to shareholders of noncontrolling interests | 1,657 | 3,252 |
| Cash dividends paid | (121,875) | (118,586) |
| Other financing activities | (2,699) | 0 |
| Cash Flows from Financing Activities | (131,602) | 148,199 |
| NET CHANGE IN CASH AND CASH EQUIVALENTS | 4,094 | 840 |
| CASH AND CASH EQUIVALENTS: | ||
| Beginning of period | 5,829 | 3,539 |
| End of period | 9,923 | 4,379 |
|
Variable Interest Entity [Member]
|
||
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Retirements of long-term debt | $ (25,498) | $ (7,765) |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of deferred income tax expense (benefit) and income tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes. No definition available.
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other current operating liabilities not separately disclosed in the statement of cash flows. No definition available.
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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 | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The portion of the deferred gain that was recognized in the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amortization of various items related to corporate-owned life insurance policies. No definition available.
|
| X | ||||||||||
|
- Definition
The current period expense charged against earnings for the amortization of capitalized nuclear fuel used to generate electricity. No definition available.
|
| X | ||||||||||
|
- Definition
The cash inflow from borrowings against the cash surrender value of corporate-owned life insurance polices. No definition available.
|
| X | ||||||||||
|
- Definition
The cash inflow associated with non-repayable money awarded to an entity to carry out a specific project. No definition available.
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the repayment of borrowings against the cash surrender value of corporate-owned life insurance polices. No definition available.
|
|
Consolidated Statements Of Changes In Equity (USD $)
In Thousands, except Share data |
Total
|
Cumulative Preferred Stock [Member]
|
Common Stock [Member]
|
Paid-In Capital [Member]
|
Retained Earnings [Member]
|
Noncontrolling Interests [Member]
|
|---|---|---|---|---|---|---|
| Beginning Balance at Dec. 31, 2011 | $ 2,800,741 | $ 21,436 | $ 628,492 | $ 1,639,503 | $ 501,216 | $ 10,094 |
| Beginning Balance (Shares) at Dec. 31, 2011 | 214,363 | 125,698,396 | ||||
| Net income | 234,767 | 0 | 0 | 0 | 229,539 | 5,228 |
| Issuance of stock | 5,348 | 0 | 928 | 4,420 | 0 | 0 |
| Issuance of stock (shares) | 0 | 185,604 | ||||
| Issuance Of Stock For Comprensation And Reinvested Dividends, Shares | 485,073 | |||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 6,551 | 2,425 | 4,126 | |||
| Stock redemption | (21,436) | 21,436 | 0 | 0 | 0 | 0 |
| Stock redemption (shares) | (214,363) | 0 | ||||
| Tax withholding related to stock compensation | (3,318) | (3,318) | ||||
| Preferred dividends | (1,616) | 0 | 0 | 0 | (1,616) | 0 |
| Dividends on common stock | (126,091) | 0 | 0 | 0 | (126,091) | 0 |
| Stock compensation expense | 5,443 | 5,443 | ||||
| Tax Benefit on stock compensation | 1,628 | 0 | 0 | 1,628 | 0 | 0 |
| Deconsolidation of variable interest entity | 0 | |||||
| Distributions to shareholders of noncontrolling interests | 3,252 | 3,252 | ||||
| Ending Balance at Sep. 30, 2012 | 2,898,765 | 0 | 631,845 | 1,651,802 | 603,048 | 12,070 |
| Ending Balance (Shares) at Sep. 30, 2012 | 0 | 126,369,073 | ||||
| Beginning Balance at Dec. 31, 2012 | 2,910,255 | 0 | 632,519 | 1,656,972 | 606,649 | 14,115 |
| Beginning Balance (Shares) at Dec. 31, 2012 | 0 | 126,503,748 | ||||
| Net income | 257,802 | 0 | 0 | 0 | 251,458 | 6,344 |
| Issuance of stock | 4,526 | 0 | 718 | 3,808 | 0 | 0 |
| Issuance of stock (shares) | 0 | 143,602 | ||||
| Issuance Of Stock For Comprensation And Reinvested Dividends, Shares | 416,689 | |||||
| Issuance Of Stock For Compensation And Reinvested Dividends | 6,933 | 2,083 | 4,850 | |||
| Tax withholding related to stock compensation | (2,425) | (2,425) | ||||
| Preferred dividends | 0 | |||||
| Dividends on common stock | (130,539) | 0 | 0 | 0 | (130,539) | 0 |
| Stock compensation expense | 6,085 | 6,085 | ||||
| Tax Benefit on stock compensation | 502 | 0 | 0 | 502 | 0 | 0 |
| Deconsolidation of variable interest entity | (14,282) | (14,282) | ||||
| Distributions to shareholders of noncontrolling interests | 1,657 | 1,657 | ||||
| Ending Balance at Sep. 30, 2013 | $ 3,037,200 | $ 0 | $ 635,320 | $ 1,669,792 | $ 727,568 | $ 4,520 |
| Ending Balance (Shares) at Sep. 30, 2013 | 0 | 127,064,039 |
| X | ||||||||||
|
- Definition
The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
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
The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. No definition available.
|
| X | ||||||||||
|
- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of shares issued which are neither cancelled nor held in the treasury. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Issuance Of Stock For Compensation And Reinvested Dividends No definition available.
|
| X | ||||||||||
|
- Definition
Issuance Of Stock For Comprensation And Reinvested Dividends, Shares No definition available.
|
|
Consolidated Statements Of Changes in Equity Parenthetical (Parentheticals) (USD $)
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.34 | $ 0.33 | $ 1.02 | $ 0.99 |
| 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
|
9 Months Ended |
|---|---|
|
Sep. 30, 2013
|
|
| 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 693,000 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, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Summary Of Significant Accounting Policies
|
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2013
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| 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) 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 2012 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 on-going basis, including those related to depreciation, unbilled revenue, valuation of investments, forecasted fuel costs included in our retail energy cost adjustment 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 and nine months ended September 30, 2013, are not necessarily indicative of the results to be expected for the full year. Restricted Cash Pursuant to Westar Energy's Articles of Incorporation, Westar Energy deposited cash in a separate bank account in 2012 to effect the redemption of all of Westar Energy's preferred stock. 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). Under the two-class method, we reduce net income attributable to common stock by the amount of dividends declared in the current period. We allocate the remaining earnings to common stock and RSUs to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. We determine the total earnings allocated to each security by adding together the amount allocated for dividends and the amount allocated for a participation feature. To compute basic EPS, we divide the earnings allocated to common stock by the weighted average number of common shares outstanding. Diluted EPS includes the effect of potential issuances of common shares resulting from our forward sale agreements and RSUs with forfeitable rights to dividend equivalents. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. The following table reconciles our basic and diluted EPS from net income.
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Supplemental Cash Flow Information
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The entire disclosure for all significant accounting policies of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Rate Matters And Regulation
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Sep. 30, 2013
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| Regulated Operations [Abstract] | |
| Rate Matters And Regulation | RATE MATTERS AND REGULATION KCC Proceedings In March 2013 we adjusted our prices to included updated transmission costs as reflected in the transmission formula rate discussed below. The Kansas Corporation Commission (KCC) issued an order in July 2013 approving our adjustment which is expected to increase our annual retail revenues by approximately $11.8 million. In May 2013, the KCC issued an order allowing us to adjust our prices to include costs associated with 2012 investments in environmental projects. The new prices were effective in June 2013 and are expected to increase our annual retail revenues by approximately $27.3 million. In April 2013, we filed with the KCC for an abbreviated rate review to adjust our prices to include $333.4 million of additional investment in the La Cygne Generating Station (La Cygne) environmental upgrades and to reflect cost reductions elsewhere. In September 2013, we reached an agreement with other major parties to the rate review. If the agreement is approved by the KCC, we estimate that the new prices will increase our annual retail revenues by approximately $30.7 million. We expect the KCC to issue an order on our request in late 2013. FERC Proceedings Our transmission formula rate that includes projected 2013 transmission capital expenditures and operating costs was effective in January 2013 and is expected to increase our annual transmission revenues by approximately $12.2 million. This updated rate provided the basis for our request with the KCC to adjust our retail prices to include updated transmission costs as discussed above. |
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The entire disclosure for public utilities. No definition available.
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Financial and Derivative 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. The three levels of the hierarchy and examples are as follows:
We record cash and cash equivalents, short-term borrowings and variable rate debt on our consolidated balance sheets at cost, which approximates fair value. We measure the fair value of fixed rate debt, a level 2 measurement, based on quoted market prices for the same or similar issues or on the current rates offered for instruments of the same remaining maturities and redemption provisions. The recorded amount of accounts receivable and other current financial instruments approximates fair value. All of our level 2 investments are held in investment funds that are measured at fair value using daily net asset values. In addition, we maintain certain level 3 investments in private equity, alternative investments and real estate securities that are also measured at fair value using net asset value, but require significant unobservable market information to measure the fair value of the underlying investments. The underlying investments in private equity are measured at fair value utilizing both market- and income-based models, public company comparables, investment cost or the value derived from subsequent financings. Adjustments are made when actual performance differs from expected performance; when market, economic or company-specific conditions change; and when other news or events have a material impact on the security. The underlying alternative investments include collateralized debt obligations, mezzanine debt and a variety of other investments. The fair value of these investments is measured using a variety of primarily market-based models utilizing inputs such as security prices, maturity, call features, ratings and other developments related to specific securities. The underlying real estate investments are measured at fair value using a combination of market- and income-based models utilizing market discount rates, projected cash flows and the estimated value into perpetuity. We measure fair value based on information available as of the measurement date. The following table provides the carrying values and measured fair values of our fixed-rate debt.
Recurring Fair Value Measurements The following table provides the amounts and their corresponding level of hierarchy for our assets that are measured at fair value.
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The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and nine months ended September 30, 2013.
The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and nine months ended September 30, 2012.
Portions of the gains and losses contributing to changes in net assets in the above tables are unrealized. The following tables summarize the unrealized gains and losses we recorded on our consolidated financial statements during the three and nine months ended September 30, 2013 and 2012, attributed to level 3 assets and liabilities.
Some of our investments in the nuclear decommissioning trust (NDT) and our trading securities portfolio are measured at net asset value 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 interest rates. Volatility in these markets impacts our costs of purchased power and costs of fuel for our generating plants. We strive to manage our customers' and our exposure to the market risks through regulatory, operating and financing activities. 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 some of 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 in a trust used to fund retirement benefits that we classify as trading securities. We include unrealized gains or losses on these securities in investment earnings on our consolidated statements of income. For the three months ended September 30, 2013, we recorded unrealized gain on these investments of $1.2 million and an unrealized loss of $2.6 million for the nine months ended September 30, 2013. For the three and nine months ended September 30, 2012, we recorded unrealized gains of $1.9 million and $3.7 million, respectively. Available-for-Sale Securities We hold investments in a trust for the purpose of funding the decommissioning of Wolf Creek. We have classified these investments as available-for-sale and have recorded all such investments at their fair market value as of September 30, 2013, and December 31, 2012. As of September 30, 2013, the fair value of available-for-sale bond funds was $43.6 million. The NDT did not have investments in debt securities outside of investment funds as of September 30, 2013. Using the specific identification method to determine cost, we realized no gains or losses on our available-for-sale securities during the three months ended September 30, 2013 or 2012. During the nine months ended September 30, 2013 and 2012, we realized gains of $4.5 million and $0.6 million, respectively. 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 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 September 30, 2013, and December 31, 2012.
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 September 30, 2013, and December 31, 2012.
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Disclosure related to investments in certain debt and equity securities classified as either trading securities or available-for-sale securities. No definition available.
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Debt Financing
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9 Months Ended |
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Sep. 30, 2013
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| Long-term Debt, Unclassified [Abstract] | |
| Debt Financing | DEBT FINANCING In August 2013, Westar Energy issued $250.0 million principal amount of first mortgage bonds bearing stated interest of 4.625% and maturing in September 2043. In June 2013, KGE redeemed two pollution control bond issues with an aggregate principal amount of $100.0 million and stated interest rates of 5.60% and 6.00%. In March 2013, Westar Energy issued $250.0 million principal amount of first mortgage bonds bearing stated interest of 4.10% and maturing in April 2043. Proceeds from the issuances were used to repay short-term debt, which had been used primarily to purchase capital equipment, to redeem bonds and for working capital and general corporate purposes. |
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The entire disclosure for long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Taxes
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9 Months Ended |
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Sep. 30, 2013
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| Income Tax Disclosure [Abstract] | |
| Taxes | TAXES We recorded income tax expense of $52.4 million with an effective income tax rate of 28% for the three months ended September 30, 2013, and income tax expense of $66.4 million with an effective income tax rate of 32% for the same period of 2012. We recorded income tax expense of $106.5 million with an effective income tax rate of 29% for the nine months ended September 30, 2013, and income tax expense of $107.2 million with an effective income tax rate of 31% for the same period of 2012. The decrease in the effective income tax rate for the three months ended September 30, 2013, was due primarily to a decrease in income before income taxes and increases in non-taxable income from corporate-owned life insurance (COLI). The decrease in the effective income tax rate for the nine months ended September 30, 2013, was due primarily to increases in non-taxable income from COLI and the utilization of previously unrecognized capital loss carryforwards to offset realized capital gains. The Internal Revenue Service (IRS) has examined our federal income tax return filed for tax year 2010 and the amended federal income tax returns we filed for tax years 2007, 2008 and 2009. The examination results, which were approved by the Joint Committee on Taxation of the U.S. Congress and accepted by the IRS in April 2013, did not have a significant impact on our consolidated statements of income or cash flows. On September 13, 2013, the IRS and United States Treasury Department released final and re-proposed tangible property regulations regarding the deduction and capitalization of expenditures related to tangible property, including the tax treatment of, among other things, materials and supplies, dispositions of property under the Modified Accelerated Cost Recovery System, general asset accounts and the determination of whether expenditures with respect to tangible property are a deductible repair or must be capitalized. The regulations are generally effective for tax years beginning on or after January 1, 2014, but may be adopted in earlier years under certain circumstances. The IRS is expected to issue transition guidance during the fourth quarter of 2013 that provides the procedures for taxpayers to change their method of accounting to comply with the regulations. We intend to adopt the guidance effective January 1, 2014. We continue to evaluate what impact the adoption of the regulations will have on our consolidated financial statements. As of this date, we do not expect the adoption of the regulations to have a material impact on our consolidated financial statements. As of September 30, 2013, and December 31, 2012, our liability for unrecognized income tax benefits was $1.6 million and $1.2 million, respectively. We do not expect significant changes in this liability in the next 12 months. As of September 30, 2013, and December 31, 2012, we had $0.2 million accrued for interest on our liability related to unrecognized income tax benefits. We accrued no penalties at either September 30, 2013, or December 31, 2012. As of September 30, 2013, and December 31, 2012, we had recorded $1.5 million for probable assessments of taxes other than income taxes. |
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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Pension and Post-Retirement Benefit Plans
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Sep. 30, 2013
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| Compensation and Retirement Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pension And Post-Retirement Benefit Plans | PENSION AND POST-RETIREMENT BENEFIT PLANS The following tables summarize the net periodic costs for our pension and post-retirement benefit plans prior to the effects of capitalization.
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During the nine months ended September 30, 2013 and 2012, we contributed $27.5 million and $56.7 million, respectively, to the Westar Energy pension trust. |
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The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Wolf Creek Pension and Post-Retirement Benefit Plans
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Sep. 30, 2013
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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 tables summarize 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 nine months ended September 30, 2013 and 2012, we funded $7.6 million and $11.9 million, respectively, of Wolf Creek's pension plan contributions. |
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Includes disclosure of the entity's share of an affiliate's pension and other post-retirement benefits. No definition available.
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Commitments And Contingencies
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9 Months Ended |
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Sep. 30, 2013
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| Commitments and Contingencies Disclosure [Abstract] | |
| Commitments And Contingencies | COMMITMENTS AND CONTINGENCIES Federal Clean Air Act We must comply with the federal Clean Air Act, state laws and implementing federal and state regulations that impose, among other things, limitations on emissions generated from our operations, including sulfur dioxide (SO2), particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), mercury and acid gases. Emissions from our generating facilities, including PM, SO2 and NOx, have been determined by regulation to reduce visibility by causing or contributing to regional haze. Under federal laws, such as the Clean Air Visibility Rule, and pursuant to an agreement with the Kansas Department of Health and Environment (KDHE) and Environmental Protection Agency (EPA), we are required to install, operate and maintain controls to reduce emissions found to cause or contribute to regional haze. Under the federal Clean Air Act, the EPA sets National Ambient Air Quality Standards (NAAQS) for certain emissions considered harmful to public health and the environment, including two classes of PM, NOx (a precursor to ozone), CO and SO2, which result from fossil fuel combustion. Areas meeting the NAAQS are designated attainment areas while those that do not meet the NAAQS are considered nonattainment areas. Each state must develop a plan to bring nonattainment areas into compliance with the NAAQS. NAAQS must be reviewed by the EPA at five-year intervals. KDHE proposed to designate portions of the Kansas City area nonattainment for the eight-hour ozone standard, which has the potential to impact our operations. The EPA has not acted on KDHE's proposed designation of the Kansas City area and it is uncertain when, or if, such a designation might occur. The Wichita area also exceeded the eight-hour ozone standard and could be designated nonattainment in the future potentially impacting our operations. In December 2012, the EPA strengthened an existing NAAQS for one class of PM. By the end of 2014, the EPA anticipates making final attainment/nonattainment designations under this rule and expects to issue a final implementation rule. We are currently evaluating the rule, however, we cannot at this time predict the impact it may have on our operations or consolidated financial results, but it could be material. In 2010 the EPA strengthened the NAAQS for both NOx and SO2. We continue to communicate with our regulators regarding these standards and are currently evaluating what impact this could have on our operations. If we are required to install additional equipment to control emissions at our facilities, the revised NAAQS could have a material impact on our operations and consolidated financial results. Environmental Projects We will continue to make significant capital and operating expenditures at our power plants to reduce regulated emissions. The amount of these expenditures could change materially depending on the timing and nature of required investments, the specific outcomes resulting from existing regulations, new regulations, legislation and the manner in which we operate the plants. In addition to the capital investment, in the event we install new equipment, such equipment may cause us to incur significant increases in annual operating and maintenance expense and may reduce the net production, reliability and availability of the plants. The degree to which we will need to reduce emissions and the timing of when such emissions controls may be required is uncertain. Additionally, our ability to access capital markets and the availability of materials, equipment and contractors may affect the timing and ultimate amount of such capital investments. In comparison to a general rate review, the environmental cost recovery rider (ECRR) reduces the amount of time it takes to begin collecting in retail prices the costs associated with capital expenditures for qualifying environmental improvements. We are not allowed to use the ECRR to collect cost associated with our approximately $610.0 million share of the projected capital investment associated with the $1.2 billion of environmental upgrades at La Cygne. We therefore must file for a general review of our rates or an abbreviated rate review with the KCC in order to collect these costs. The KCC approved our request to file an abbreviated rate review to collect a portion of these costs. For additional information regarding our abbreviated rate review, see Note 3, "Rate Matters and Regulation." To change our prices to collect increased operating and maintenance costs, we must file a general rate review with the KCC. Air Emissions The operation of power plants results in emissions of mercury, acid gases and other air toxics. In 2012, the EPA's Mercury and Air Toxics Standards (MATS) for power plants became effective, which replaced the prior federal Clean Air Mercury Rule (CAMR) and requires significant reductions in mercury, acid gases and other emissions. We expect to be compliant with the new standards by April 2016 as approved by our state environmental regulatory agency. We continue to evaluate the new standards and believe that our related investment will be approximately $17.0 million. Additionally, in March 2013, the EPA finalized updates to certain emission limits for new power plants under MATS. We are currently evaluating these updates; however, because of environmental upgrades we have made and continue to make at our power plants to comply with regional haze requirements and the EPA consent decree discussed below, we believe the EPA's updates will have an immaterial impact on our future generation plans. In 2011 the EPA finalized the Cross-State Air Pollution Rule (CSAPR) requiring 28 states, including Kansas, Missouri and Oklahoma, to further reduce power plant emissions of SO2 and NOx. Under CSAPR, reductions in annual SO2 and NOx emissions were required to begin January 2012, with further reductions required beginning January 2014. In August 2012, the U.S. Court of Appeals for the District of Columbia Circuit vacated CSAPR and remanded the rule to the EPA to promulgate a replacement. In October 2012, the EPA filed a petition with the circuit court requesting a rehearing before the full court, which was declined in January 2013. The EPA subsequently petitioned the U.S. Supreme Court to review the circuit court's ruling and the petition was granted in June 2013. We cannot at this time predict the outcome of the U.S. Supreme Court's review; however, based on our current and planned environmental controls, if the regulations were to be reinstated or replaced, either in part or in whole, we do not believe the impact on our operations and consolidated financial results would be material. Greenhouse Gases Under regulations known as the Tailoring Rule, the EPA regulates greenhouse gas (GHG) emissions from certain stationary sources. The regulations are being implemented pursuant to two federal Clean Air Act programs which impose recordkeeping and monitoring requirements and also mandate the implementation of best available control technology (BACT) for projects that cause a significant increase in GHG emissions (defined to be more than 75,000 tons or more per year or 100,000 tons or more per year, depending on various factors). The EPA has issued guidance on what BACT entails for the control of GHGs and individual states are now required to determine what controls are required for facilities within their jurisdiction on a case-by-case basis. We cannot at this time determine the impact of these regulations on our future operations and consolidated financial results, but we believe the cost of compliance with the regulations could be material. Renewable Energy Standard Kansas law mandates that we maintain a minimum amount of renewable energy sources. Through 2015 net renewable generation capacity must be 10% of the average peak demand for the three prior years, subject to limited exceptions. This requirement increases to 15% for years 2016 through 2019 and 20% for 2020 and thereafter. With our existing wind generation facilities, supply contracts and renewable energy credits, we are able to satisfy the net renewable generation requirement through 2015 and we are on track to meet the increased requirements beginning in 2016. If we are unable to meet future requirements, our operations and consolidated financial results could be adversely impacted. EPA Consent Decree As part of a 2010 settlement of a lawsuit filed by the Department of Justice on behalf of the EPA, we are installing selective catalytic reduction (SCR) equipment on one of three Jeffrey Energy Center (JEC) coal units to be completed by the end of 2014, which we estimate will cost approximately $240.0 million. The settlement also required that we determine whether we needed to install additional SCR equipment on another JEC unit or if we can meet agreed upon plant-wide NOx emissions reduction limits using other controls. We have informed the EPA that we believe we can meet the terms of the settlement by installing less expensive NOx reduction equipment rather than additional SCR equipment. We plan to complete these projects in 2014 and to recover the costs to install the equipment through our ECRR, but such recovery remains subject to the approval of our regulators. |
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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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| 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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Open legal proceedings in the normal course of business, including product liability and other litigation and contingencies. No definition available.
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Common Stock
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| Common Stock | COMMON STOCK In September 2013, Westar Energy entered into two forward sale agreements with banks. Under the terms of the agreements, the banks, as forward sellers, borrowed 8.0 million shares of Westar Energy's common stock from third parties and sold them to a group of underwriters for $31.15 per share. Under over-allotment options included in the agreements, the underwriters purchased in the fourth quarter an additional 0.9 million shares, increasing the total number of shares under the forward sale agreements to approximately 8.9 million. The underwriters received a commission equal to 3.5% of the sales price of all shares sold under the agreement. Westar Energy must settle such transactions within 24 months. In March 2013, Westar Energy entered into a new, three-year sales agency financing agreement and master forward sale agreement similar to the sales agency financing agreement and forward sale agreements entered into in April 2010. The maximum amount that Westar Energy may offer and sell under the March 2013 agreements is the lesser of an aggregate of $500.0 million or approximately 25.0 million shares, subject to adjustment for share splits, share combinations and share dividends. Under the terms of the sales agency financing agreement, Westar Energy may offer and sell shares of its common stock from time to time. In addition, under the terms of the March 2013 sales agency financing agreement and master forward sale agreement, Westar Energy may from time to time enter into one or more forward sale transactions with the bank, as forward purchaser, and the bank will borrow shares of Westar Energy's common stock from third parties and sell them through its agent. The agent receives a commission equal to 1% of the sales price of all shares sold under the agreements. Westar Energy must settle the forward sale transactions within 18 months of the date each transaction is entered. Under the terms of March 2013 agreements and April 2010 agreements, during the nine months ended September 30, 2013 Westar Energy entered into transactions with respect to an aggregate of approximately 2.5 million shares of common stock resulting in 4.2 million shares that could be settled as of September 30, 2013. Assuming physical share settlement of the approximately 12.2 million shares associated with all forward sale transactions as of September 30, 2013, Westar Energy would have received aggregate proceeds of approximately $362.7 million based on a forward price of $29.72 per share. The forward sale transactions are entered into at market prices; therefore, the forward sale agreements have no initial fair value. Westar Energy will not receive any proceeds from the sale of common stock under the forward sale agreements until transactions are settled. Upon settlement, Westar Energy will record the forward sale agreements within equity. Except in specified circumstances or events that would require physical share settlement, Westar Energy is able to elect to settle any forward sale transactions by means of physical share, cash or net share settlement, and is also able to elect to settle the forward sale transactions in whole, or in part, earlier than the stated maturity dates. Currently, Westar Energy anticipates settling the forward sale transactions through physical share settlement. The shares under the forward sale agreements are initially priced when the transactions are entered into and are subject to certain fixed pricing adjustments during the term of the agreements. Accordingly, assuming physical share settlement, Westar Energy's net proceeds from the forward sale transactions will represent the prices established by the forward sale agreements applicable to the time periods in which physical settlement occurs. |
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Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Variable Interest Entities
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| 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 JEC, our 50% interest in La Cygne unit 2 and railcars we use to transport coal to some of our power plants are VIEs of which we are the primary beneficiary. We assess all entities with which we become involved to determine whether such entities are VIEs and, if so, whether or not we are the primary beneficiary of the entities. We also continuously assess whether we are the primary beneficiary of the VIEs with which we are involved. Prospective changes in facts and circumstances may cause us to reconsider our determination as it relates to the identification of the primary beneficiary. 8% Interest in Jeffrey Energy Center Under an agreement that expires in January 2019, we lease an 8% interest in JEC from a trust. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 8% interest in JEC and lease it to a third party, and does not hold any other assets. We meet the requirements to be considered the primary beneficiary of the trust. In determining the primary beneficiary of the trust, we concluded that the activities of the trust that most significantly impact its economic performance and that we have the power to direct include (1) the operation and maintenance of the 8% interest in JEC, (2) our ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount and (3) our option to require refinancing of the trust's debt. We have the potential to receive benefits from the trust that could potentially be significant if the fair value of the 8% interest in JEC at the end of the agreement is greater than the fixed amount. The possibility of lower interest rates upon refinancing the debt also creates the potential for us to receive significant benefits. 50% Interest in La Cygne Unit 2 Under an agreement that expires in September 2029, KGE entered into a sale-leaseback transaction with a trust under which the trust purchased KGE's 50% interest in La Cygne unit 2 and subsequently leased it back to KGE. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 50% interest in La Cygne unit 2 and lease it back to KGE, and does not hold any other assets. We meet the requirements to be considered the primary beneficiary of the trust. In determining the primary beneficiary of the trust, we concluded that the activities of the trust that most significantly impact its economic performance and that we have the power to direct include (1) the operation and maintenance of the 50% interest in La Cygne unit 2, (2) our ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount and (3) our option to require refinancing of the trust's debt. We have the potential to receive benefits from the trust that could potentially be significant if the fair value of the 50% interest in La Cygne unit 2 at the end of the agreement is greater than the fixed amount. The possibility of lower interest rates upon refinancing the debt also creates the potential for us to receive significant benefits. Railcars We leased railcars from an unrelated trust to transport coal to some of our power plants. We consolidated the trust as a VIE until the agreement expired in May 2013. As a result of deconsolidating the trust, property, plant and equipment of VIEs, net, and noncontrolling interests decreased $14.3 million. We also lease railcars from another unrelated trust under an agreement that expires in November 2014. 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 railcars and lease them to us, and does not hold any other assets. We meet the requirements to be considered the primary beneficiary of this 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 the operation, maintenance and repair of the railcars and our ability to exercise a purchase option at the end of the agreements 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 railcars at the end of the agreements is greater than the fixed amount. Our agreement with this trust also includes renewal options during which time we would pay a fixed amount of rent. We have the potential to receive benefits from the trust during the renewal period if the fixed amount of rent is less than the amount we would be required to pay under a new agreement. 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 recorded no gain or loss upon initial consolidation of the VIEs or upon deconsolidation of the rail car VIE. |
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Variable Interest Entities Disclosure [Text Block] No definition available.
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Summary Of Significant Accounting Policies (Policy)
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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) 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 on-going basis, including those related to depreciation, unbilled revenue, valuation of investments, forecasted fuel costs included in our retail energy cost adjustment 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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| Restricted Cash | Restricted Cash Pursuant to Westar Energy's Articles of Incorporation, Westar Energy deposited cash in a separate bank account in 2012 to effect the redemption of all of Westar Energy's preferred stock. |
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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). Under the two-class method, we reduce net income attributable to common stock by the amount of dividends declared in the current period. We allocate the remaining earnings to common stock and RSUs to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. We determine the total earnings allocated to each security by adding together the amount allocated for dividends and the amount allocated for a participation feature. To compute basic EPS, we divide the earnings allocated to common stock by the weighted average number of common shares outstanding. Diluted EPS includes the effect of potential issuances of common shares resulting from our forward sale agreements and RSUs with forfeitable rights to dividend equivalents. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. |
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| Supplemental Cash Flow Information | Supplemental Cash Flow Information
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Disclosure of accounting policy for AFUDC (for example, component of PPE, credit to income statement), information regarding the inclusion in rates (only capitalized if its inclusion in rates is probable) and description of AFUDC (for example, represents the cost of capital used during construction). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Entity's cash and cash equivalents accounting policy with respect to restricted balances. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Disclosure of accounting policy for 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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| 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.
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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| X | ||||||||||
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- Definition
Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of all information related to inventories for utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of an entity's allowance for funds used during construction. No definition available.
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Financial and Derivative Instruments and Trading Securities (Tables)
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9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2013
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| Financial And Derivative Instruments and Trading Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Carrying Values And Fair Values Of Financial Instruments | The following table provides the carrying values and measured fair values of our fixed-rate debt.
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| Fair Value Of Assets And Liabilities | The following table provides the amounts and their corresponding level of hierarchy for our assets that are measured at fair value.
_______________
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| Reconciliations Of Assets And Liabilities At Fair Value | The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and nine months ended September 30, 2013.
The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and nine months ended September 30, 2012.
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| Unrealized Gains And Losses On Fair Value Assets And Liabilities | The following tables summarize the unrealized gains and losses we recorded on our consolidated financial statements during the three and nine months ended September 30, 2013 and 2012, attributed to level 3 assets and liabilities.
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| Investments In Financial Instruments | The following table provides additional information on these investments.
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| X | ||||||||||
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- Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Schedule of Carrying Value and Fair Values of Financial Instruments. No definition available.
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| X | ||||||||||
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- Definition
Schedule of unrealized gains and losses recorded for assets and liabilities measured at fair value on a recurring basis using unobservable inputs. No definition available.
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Financial Investments (Tables)
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Sep. 30, 2013
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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 September 30, 2013, and December 31, 2012.
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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 September 30, 2013, and December 31, 2012.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. No definition available.
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| X | ||||||||||
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- Definition
Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Pension and Post-Retirement Benefit Plans (Tables)
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9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2013
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| Defined Benefit Plan Disclosure [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following tables summarize the net periodic costs for our pension and post-retirement benefit plans prior to the effects of capitalization.
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_______________
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| X | ||||||||||
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- Details
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| X | ||||||||||
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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)
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9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2013
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| Wolf Creek Pension And Post-Retirement Benefit Plans [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following tables summarize 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]
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| Wolf Creek Pension And Post-Retirement Benefit Plans [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Periodic Benefit Costs [Table Text Block] | The following tables summarize 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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_______________
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| X | ||||||||||
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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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| X | ||||||||||
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- Details
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Variable Interest Entities (Tables)
|
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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| 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 | ||||||||||
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- Definition
Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Description Of Business (Details)
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9 Months Ended |
|---|---|
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Sep. 30, 2013
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of customers in Kansas | 693,000 |
| X | ||||||||||
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- Details
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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, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Public Utilities, Inventory [Line Items] | ||
| Total | $ 237,591 | $ 249,016 |
|
Fuel Inventory [Member]
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||
| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | 78,517 | 94,664 |
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Supplies [Member]
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| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | $ 159,074 | $ 154,352 |
| X | ||||||||||
|
- Definition
Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The period end amount for a type of inventory held by the utility in a schedule of inventories. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Summary Of Significant Accounting Policies (Allowance For Funds Used During Construction) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Accounting Policies [Abstract] | ||||
| Borrowed funds | $ 2,964 | $ 2,132 | $ 8,132 | $ 8,091 |
| Equity funds | 3,783 | 2,317 | 9,473 | 9,096 |
| Total | $ 6,747 | $ 4,449 | $ 17,605 | $ 17,187 |
| Average AFUDC rates | 5.10% | 4.60% | 4.60% | 5.20% |
| X | ||||||||||
|
- Details
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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 $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Accounting Policies [Abstract] | ||||
| Less: Preferred dividends | $ 0 | $ 0 | $ 0 | $ 1,616 |
| Net income allocated to RSUs | 372 | 397 | 703 | 652 |
| Net income allocated to common stock | $ 132,753 | $ 138,884 | $ 250,755 | $ 227,271 |
| Weighted Average Number of Shares Outstanding , Basic | 127,444,792 | 126,783,248 | 127,318,462 | 126,638,992 |
| RSUs | 46,189 | 169,900 | 36,738 | 151,022 |
| Forward sale agreements | 620,491 | 181,376 | 496,277 | 65,372 |
| Weighted average equivalent common shares outstanding - diluted | 128,111,472 | 127,134,524 | 127,851,477 | 126,855,386 |
| Earnings Per Share, Basic | $ 1.04 | $ 1.10 | $ 1.97 | $ 1.79 |
| Earnings Per Share, Diluted | $ 1.04 | $ 1.09 | $ 1.96 | $ 1.79 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Antidilutive securities | 0 | 0 | 0 | 0 |
| X | ||||||||||
|
- Details
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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 | ||||||||||
|
- Details
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| X | ||||||||||
|
- Definition
Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
Aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed. No definition available.
|
| 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.
|
| X | ||||||||||
|
- Definition
Additional common shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward sale agreements using the treasury stock method. No definition available.
|
|
Summary Of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Cash Paid For (Received From) | ||
| Interest on financing activities | $ 107,512 | $ 103,461 |
| Income taxes, net of refunds | (96) | (4,559) |
| Noncash Investing and Financing Transactions | ||
| Property, plant and equipment | 68,249 | 64,947 |
| Issuance of common stock for reinvested dividends and compensation plans | 6,933 | 6,551 |
| Deconsolidation of VIE | (14,282) | 0 |
| Assets acquired through capital leases | 328 | 9,898 |
|
Variable Interest Entity, Primary Beneficiary [Member]
|
||
| Cash Paid For (Received From) | ||
| Interest on financing activities | 13,865 | 9,132 |
| Noncash Investing and Financing Transactions | ||
| Property, plant and equipment | $ (14,282) | $ 0 |
| X | ||||||||||
|
- Definition
The increase during the period in capital lease obligations due to entering into new capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of cash paid for interest during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| 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 amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. No definition available.
|
| X | ||||||||||
|
- Definition
The fair value of stock issued in noncash financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Rate Matters And Regulation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
1 Months Ended | ||||
|---|---|---|---|---|---|
|
Apr. 30, 2013
|
Dec. 31, 2013
|
Jun. 30, 2013
|
Mar. 20, 2013
|
Jan. 31, 2013
|
|
| Regulatory Proceedings [Line Items] | |||||
| Estimated Increase In Annual Retail Revenues For Transmission Costs | $ 11.8 | ||||
| Estimated Increase In Annual Retail Revenues For Environmental Costs | 27.3 | ||||
| Investment In Environmental Upgrades Jointly Owned Utility Plant | 333.4 | ||||
| Proposed Increase In Annual Retail Revenues | 30.7 | ||||
| Expected Increase In Annual Transmission Revenues | $ 12.2 |
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Environmental Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Transmission Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Transmission Revenues No definition available.
|
| X | ||||||||||
|
- Definition
Investment In Environmental Upgrades Jointly Owned Utility Plant No definition available.
|
| X | ||||||||||
|
- Definition
Proposed Increase In Annual Retail Revenues No definition available.
|
| X | ||||||||||
|
- Details
|
|
Financial and Derivative Instruments and Trading Securities (Carrying Values And Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
|---|---|---|
|
Fixed Rate Debt Member
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | $ 3,102,500 | $ 2,702,500 |
| Fair Value | 3,301,479 | 3,178,752 |
|
Fixed Rate Debt Of Variable Interest Entities Member
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | 222,126 | 247,624 |
| Fair Value | $ 237,848 | $ 275,341 |
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial and Derivative Instruments and Trading Securities (Fair Value Of Assets And Liabilities) (Details) (USD $)
|
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | $ 167,548,000 | $ 150,754,000 |
| Trading securities | 33,384,000 | 43,484,000 |
| Total assets measured at fair value | 200,932,000 | 194,238,000 |
| Funds withdrawn from sale of trading securities | 14,800,000 | |
|
Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,000 | 38,000 |
| Trading securities | 166,000 | 166,000 |
| Total assets measured at fair value | 174,000 | 204,000 |
|
Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 138,241,000 | 137,952,000 |
| Trading securities | 33,218,000 | 43,318,000 |
| Total assets measured at fair value | 171,459,000 | 181,270,000 |
|
Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 29,299,000 | 12,764,000 |
| Trading securities | 0 | 0 |
| Total assets measured at fair value | 29,299,000 | 12,764,000 |
|
Domestic Equity [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 53,352,000 | 61,056,000 |
| Trading securities | 17,402,000 | 22,470,000 |
|
Domestic Equity [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 [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 48,059,000 | 56,157,000 |
| Trading securities | 17,402,000 | 22,470,000 |
|
Domestic Equity [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 5,293,000 | 4,899,000 |
| Trading securities | 0 | 0 |
|
International Equity [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 30,698,000 | 30,041,000 |
| Trading securities | 4,431,000 | 5,744,000 |
|
International Equity [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 [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 30,698,000 | 30,041,000 |
| Trading securities | 4,431,000 | 5,744,000 |
|
International Equity [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 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 16,580,000 | 28,350,000 |
| Trading securities | 11,385,000 | 15,104,000 |
|
Core Bonds [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 [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 16,580,000 | 28,350,000 |
| Trading securities | 11,385,000 | 15,104,000 |
|
Core Bonds [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 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 12,459,000 | 8,782,000 |
|
High-Yield Bonds [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
High-Yield Bonds [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 12,459,000 | 8,782,000 |
|
High-Yield Bonds [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
Emerging Market Bonds [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 9,949,000 | 6,428,000 |
|
Emerging Market Bonds [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
Emerging Market Bonds [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 9,949,000 | 6,428,000 |
|
Emerging Market Bonds [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
Other Fixed Income [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 4,657,000 | |
|
Other Fixed Income [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Other Fixed Income [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 4,657,000 | |
|
Other Fixed Income [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Combination Debt Equity And Other Fund [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 15,839,000 | |
|
Combination Debt Equity And Other Fund [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Combination Debt Equity And Other Fund [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 15,839,000 | |
|
Combination Debt Equity And Other Fund [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Combination Debt and Equity Fund [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,194,000 | |
|
Combination Debt and Equity Fund [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Combination Debt and Equity Fund [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,194,000 | |
|
Combination Debt and Equity Fund [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Alternative Funds [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 15,569,000 | |
|
Alternative Funds [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Alternative Funds [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | |
|
Alternative Funds [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 15,569,000 | |
|
Real Estate Securities [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,437,000 | 7,865,000 |
|
Real Estate Securities [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
Real Estate Securities [Member] | Level 2 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 0 | 0 |
|
Real Estate Securities [Member] | Level 3 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,437,000 | 7,865,000 |
|
Cash Equivalents [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,000 | 38,000 |
| Trading securities | 166,000 | 166,000 |
|
Cash Equivalents [Member] | Level 1 [Member]
|
||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||
| Nuclear decommissioning trust assets | 8,000 | 38,000 |
| Trading securities | 166,000 | 166,000 |
|
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 |
| 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
The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). 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 | ||||||||||
|
- Details
|
|
Financial and Derivative Instruments and Trading Securities(Reconciliations Of Assets And Liabilities At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Balance at period start | $ 28,409 | $ 12,229 | $ 12,764 | $ 11,026 |
| Regulatory liabilities | 830 | 153 | 1,557 | 700 |
| Purchases | 227 | 172 | 15,502 | 962 |
| Sales | (167) | (63) | (524) | (197) |
| Balance at period end | 29,299 | 12,491 | 29,299 | 12,491 |
|
Domestic Equity [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Balance at period start | 5,014 | 4,780 | 4,899 | 3,931 |
| Regulatory liabilities | 219 | (1) | 416 | 192 |
| Purchases | 155 | 109 | 290 | 777 |
| Sales | (95) | 0 | (312) | (12) |
| Balance at period end | 5,293 | 4,888 | 5,293 | 4,888 |
|
Alternative Funds [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Balance at period start | 15,234 | 0 | ||
| Regulatory liabilities | 335 | 569 | ||
| Purchases | 0 | 15,000 | ||
| Sales | 0 | 0 | ||
| Balance at period end | 15,569 | 15,569 | ||
|
Real Estate Securities [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Balance at period start | 8,161 | 7,449 | 7,865 | 7,095 |
| Regulatory liabilities | 276 | 154 | 572 | 508 |
| Purchases | 72 | 63 | 212 | 185 |
| Sales | (72) | (63) | (212) | (185) |
| Balance at period end | $ 8,437 | $ 7,603 | $ 8,437 | $ 7,603 |
| X | ||||||||||
|
- Definition
Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory liabilities on the statement of financial position. No definition available.
|
|
Financial and Derivative Instruments and Trading Securities (Unrealized Gains And Losses On Financial Statements) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Unrealized gain (loss) included in regulatory liabilities | $ 665 | $ 89 | $ 1,034 | $ 501 |
|
Domestic Equity [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Unrealized gain (loss) included in regulatory liabilities | 125 | (1) | 105 | 179 |
|
Alternative Funds [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Unrealized gain (loss) included in regulatory liabilities | 335 | 569 | ||
|
Real Estate Securities [Member]
|
||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||
| Unrealized gain (loss) included in regulatory liabilities | $ 205 | $ 90 | $ 360 | $ 322 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
This element represents total unrealized gains or losses for the period arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory liabilities on the statement of financial position. No definition available.
|
|
Financial and Derivative Instruments and Trading Securities (Investments In Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | $ 167,548 | $ 150,754 | ||||
| Trading securities | 33,384 | 43,484 | ||||
| Total | 200,932 | 194,238 | ||||
|
Domestic Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 53,352 | 61,056 | ||||
| Trading securities | 17,402 | 22,470 | ||||
|
Alternative Funds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 15,569 | |||||
|
Real Estate Securities [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 8,437 | 7,865 | ||||
|
International Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 30,698 | 30,041 | ||||
| Trading securities | 4,431 | 5,744 | ||||
|
Core Bonds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 16,580 | 28,350 | ||||
| Trading securities | 11,385 | 15,104 | ||||
|
Fair Value [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 29,299 | 12,764 | ||||
| Trading securities | 33,218 | 43,318 | ||||
| Total | 62,517 | 56,082 | ||||
| Unfunded commitments | 2,734 | 1,024 | ||||
|
Fair Value [Member] | Domestic Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 5,293 | 4,899 | ||||
| Trading securities | 17,402 | 22,470 | ||||
|
Fair Value [Member] | Alternative Funds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 15,569 | 0 | ||||
|
Fair Value [Member] | Real Estate Securities [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Nuclear decommissioning trust assets | 8,437 | [1] | 7,865 | [1] | ||
|
Fair Value [Member] | International Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Trading securities | 4,431 | 5,744 | ||||
|
Fair Value [Member] | Core Bonds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Trading securities | 11,385 | 15,104 | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 2,734 | 1,024 | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Domestic Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 2,734 | 1,024 | ||||
| Investment redemption frequency | (a) | |||||
| Investment redemption length of settlement | (a) | |||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Alternative Funds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 0 | 0 | ||||
| Investment redemption frequency | (b) | |||||
| Investment redemption length of settlement | (b) | |||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Real Estate Securities [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 0 | [1] | 0 | [1] | ||
| Investment redemption frequency | Quarterly | |||||
| Investment redemption length of settlement | 80 days | |||||
|
Trading Securities [Member] | Fair Value [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 0 | 0 | ||||
|
Trading Securities [Member] | Fair Value [Member] | Domestic Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 0 | 0 | ||||
| Investment redemption frequency | Upon Notice | |||||
| Investment redemption length of settlement | 1 day | |||||
|
Trading Securities [Member] | Fair Value [Member] | International Equity [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | 0 | 0 | ||||
| Investment redemption frequency | Upon Notice | |||||
| Investment redemption length of settlement | 1 day | |||||
|
Trading Securities [Member] | Fair Value [Member] | Core Bonds [Member]
|
||||||
| Financial and Derivative Instruments and Trading Securities [Line Items] | ||||||
| Unfunded commitments | $ 0 | $ 0 | ||||
| Investment redemption frequency | Upon Notice | |||||
| Investment redemption length of settlement | 1 day | |||||
|
||||||
| X | ||||||||||
|
- Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
States the frequency (for example, annually, semi-annually, quarterly) with which the entity can redeem its investment, or portion thereof, for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
States the notice requirement (for example, 30 to 60 days) the entity is required to deliver before it 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
The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Schedule of Available-for-sale Securities [Line Items] | ||||
| Unrealized gains losses | $ 1.2 | $ 1.9 | $ (2.6) | $ 3.7 |
| Fair value of available-for-sale bond funds | 43.6 | 43.6 | ||
| Realized gains on available-for-sale-securities | $ 0 | $ 0 | $ 4.5 | $ 0.6 |
| X | ||||||||||
|
- Definition
Amount of debt securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| 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 | ||||||||||
|
- Details
|
| 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, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | $ 148,653 | $ 141,350 |
| Available-for-sale Securities, Gross Unrealized Gain | 21,744 | 11,520 |
| Available-for-sale Securities, Gross Unrealized Loss | (2,849) | (2,116) |
| Available-for-sale Securities | 167,548 | 150,754 |
| Allocation | 100.00% | 100.00% |
|
Domestic Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 38,911 | 53,598 |
| Available-for-sale Securities, Gross Unrealized Gain | 14,441 | 7,458 |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | 0 |
| Available-for-sale Securities | 53,352 | 61,056 |
| Allocation | 33.00% | 41.00% |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 26,419 | 28,248 |
| Available-for-sale Securities, Gross Unrealized Gain | 4,432 | 1,793 |
| Available-for-sale Securities, Gross Unrealized Loss | (153) | 0 |
| Available-for-sale Securities | 30,698 | 30,041 |
| Allocation | 18.00% | 20.00% |
|
Core Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 16,592 | 27,309 |
| Available-for-sale Securities, Gross Unrealized Gain | 0 | 1,041 |
| Available-for-sale Securities, Gross Unrealized Loss | (12) | 0 |
| Available-for-sale Securities | 16,580 | 28,350 |
| Allocation | 10.00% | 19.00% |
|
High-Yield Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 11,804 | 8,022 |
| Available-for-sale Securities, Gross Unrealized Gain | 655 | 760 |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | 0 |
| Available-for-sale Securities | 12,459 | 8,782 |
| Allocation | 7.00% | 6.00% |
|
Emerging Market Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 10,641 | 6,080 |
| Available-for-sale Securities, Gross Unrealized Gain | 0 | 348 |
| Available-for-sale Securities, Gross Unrealized Loss | (692) | 0 |
| Available-for-sale Securities | 9,949 | 6,428 |
| Allocation | 6.00% | 4.00% |
|
Other Fixed Income [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 4,646 | |
| Available-for-sale Securities, Gross Unrealized Gain | 11 | |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | |
| Available-for-sale Securities | 4,657 | |
| Allocation | 3.00% | |
|
Combination Debt Equity And Other Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 14,439 | |
| Available-for-sale Securities, Gross Unrealized Gain | 1,636 | |
| Available-for-sale Securities, Gross Unrealized Loss | (236) | |
| Available-for-sale Securities | 15,839 | |
| Allocation | 9.00% | |
|
Combination Debt and Equity Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 8,074 | |
| Available-for-sale Securities, Gross Unrealized Gain | 120 | |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | |
| Available-for-sale Securities | 8,194 | |
| Allocation | 5.00% | |
|
Alternative Funds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 15,000 | |
| Available-for-sale Securities, Gross Unrealized Gain | 569 | |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | |
| Available-for-sale Securities | 15,569 | |
| Allocation | 9.00% | |
|
Real Estate Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 10,193 | 9,981 |
| Available-for-sale Securities, Gross Unrealized Gain | 0 | 0 |
| Available-for-sale Securities, Gross Unrealized Loss | (1,756) | (2,116) |
| Available-for-sale Securities | 8,437 | 7,865 |
| Allocation | 5.00% | 5.00% |
|
Cash Equivalents [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 8 | 38 |
| Available-for-sale Securities, Gross Unrealized Gain | 0 | 0 |
| Available-for-sale Securities, Gross Unrealized Loss | 0 | 0 |
| Available-for-sale Securities | $ 8 | $ 38 |
| X | ||||||||||
|
- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Available-for-sale Securities, Security Type Allocation Percentage No definition available.
|
|
Financial Investments (Fair Value And The Gross Unrealized Losses Of the Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
|
|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | $ 38,578 | |
| Gross Unrealized Losses, Less than 12 Months | (1,093) | |
| Fair Value, 12 Months or Greater | 8,437 | |
| Gross Unrealized Losses, 12 Months or Greater | (1,756) | |
| Fair Value, Total | 47,015 | |
| Gross Unrealized Losses, Total | (2,849) | |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 6,065 | |
| Gross Unrealized Losses, Less than 12 Months | (153) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 6,065 | |
| Gross Unrealized Losses, Total | (153) | |
|
Core Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 16,580 | |
| Gross Unrealized Losses, Less than 12 Months | (12) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 16,580 | |
| Gross Unrealized Losses, Total | (12) | |
|
Emerging Market Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 9,949 | |
| Gross Unrealized Losses, Less than 12 Months | (692) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 9,949 | |
| Gross Unrealized Losses, Total | (692) | |
|
Combination Debt Equity And Other Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 5,984 | |
| Gross Unrealized Losses, Less than 12 Months | (236) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 5,984 | |
| Gross Unrealized Losses, Total | (236) | |
|
Real Estate Securities [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 | 8,437 | 7,865 |
| Gross Unrealized Losses, 12 Months or Greater | (1,756) | (2,116) |
| Fair Value, Total | 8,437 | 7,865 |
| Gross Unrealized Losses, Total | $ (1,756) | $ (2,116) |
| X | ||||||||||
|
- Definition
Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized loss on securities classified as available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Debt Financing (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 1 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Jun. 30, 2013
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instruments 8780 And 8790 [Member]
|
Jun. 30, 2013
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instrument 8780 [Member]
|
Jun. 30, 2013
KGE [Member]
Pollution Control Bond Series [Member]
Debt Instrument 8790 [Member]
|
Aug. 01, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8870 [Member]
|
Mar. 28, 2013
Westar Energy [Member]
Secured Debt [Member]
Debt Instrument 8860 [Member]
|
|
| Debt Instrument [Line Items] | |||||||
| Retirements of long-term debt | $ 100,000 | $ 220,563 | $ 100,000 | ||||
| Principal amount of first mortgage bonds | $ 250,000 | $ 250,000 | |||||
| Stated interest rate on first mortgage bonds | 5.60% | 6.00% | 4.625% | 4.10% | |||
| X | ||||||||||
|
- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
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
|
|
Taxes Taxes (Narrative) (Details) (USD $)
|
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
|
| Income Tax Contingency [Line Items] | |||||
| Income tax expense | $ 52,392,000 | $ 66,372,000 | $ 106,514,000 | $ 107,156,000 | |
| Effective income tax rate | 28.00% | 32.00% | 29.00% | 31.00% | |
| Liability for unrecognized income tax benefits | 1,600,000 | 1,600,000 | 1,200,000 | ||
| Interest on liability related to unrecognized income tax benefits | 200,000 | 200,000 | 200,000 | ||
| Penalties accrued for unrecognized income tax benefits | 0 | 0 | 0 | ||
| Accrual for taxes other than income taxes | $ 1,500,000 | $ 1,500,000 | $ 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 | ||||||||||
|
- Details
|
| 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 $)
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | $ 27,500,000 | $ 56,700,000 | ||
|
Pension Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 5,355,000 | 4,889,000 | 16,065,000 | 14,666,000 |
| Interest cost | 9,630,000 | 9,894,000 | 28,890,000 | 29,683,000 |
| Expected return on plan assets | (8,351,000) | (8,070,000) | (25,053,000) | (24,212,000) |
| Transition obligation, net | 0 | 0 | 0 | 0 |
| Prior service costs | 150,000 | 153,000 | 451,000 | 460,000 |
| Actuarial loss, net | 8,478,000 | 8,194,000 | 25,435,000 | 24,582,000 |
| Net periodic cost before regulatory adjustment | 15,262,000 | 15,060,000 | 45,788,000 | 45,179,000 |
| Regulatory adjustment | 784,000 | 615,000 | 2,351,000 | (8,635,000) |
| Net periodic cost | 16,046,000 | 15,675,000 | 48,139,000 | 36,544,000 |
|
Post-Retirement Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 507,000 | 514,000 | 1,521,000 | 1,543,000 |
| Interest cost | 1,502,000 | 1,575,000 | 4,505,000 | 4,723,000 |
| Expected return on plan assets | (1,673,000) | (1,373,000) | (5,018,000) | (4,118,000) |
| Transition obligation, net | 81,000 | 978,000 | 244,000 | 2,934,000 |
| Prior service costs | 631,000 | 631,000 | 1,893,000 | 1,893,000 |
| Actuarial loss, net | 281,000 | 376,000 | 843,000 | 1,127,000 |
| Net periodic cost before regulatory adjustment | 1,329,000 | 2,701,000 | 3,988,000 | 8,102,000 |
| Regulatory adjustment | 717,000 | (261,000) | 2,151,000 | (12,000) |
| Net periodic cost | $ 2,046,000 | $ 2,440,000 | $ 6,139,000 | $ 8,090,000 |
| X | ||||||||||
|
- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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.
|
|
Wolf Creek Pension and Post-Retirement Benefit Plans Wolf Creek Pension and Post-Retirement Benefit Plans (Net Periodic Costs and Pension Contributions) (Details) (USD $)
|
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | $ 27,500,000 | $ 56,700,000 | ||
|
Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | 7,600,000 | 11,900,000 | ||
|
KGE [Member]
|
||||
| Subsidiary Interest in Defined Benefit Plans | 47.00% | |||
|
Pension Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 5,355,000 | 4,889,000 | 16,065,000 | 14,666,000 |
| Interest cost | 9,630,000 | 9,894,000 | 28,890,000 | 29,683,000 |
| Expected return on plan assets | (8,351,000) | (8,070,000) | (25,053,000) | (24,212,000) |
| Transition obligation, net | 0 | 0 | 0 | 0 |
| Prior service costs | 150,000 | 153,000 | 451,000 | 460,000 |
| Actuarial loss, net | 8,478,000 | 8,194,000 | 25,435,000 | 24,582,000 |
| Net periodic cost before regulatory adjustment | 15,262,000 | 15,060,000 | 45,788,000 | 45,179,000 |
| Regulatory adjustment | 784,000 | 615,000 | 2,351,000 | (8,635,000) |
| Net periodic cost | 16,046,000 | 15,675,000 | 48,139,000 | 36,544,000 |
|
Pension Benefits [Member] | Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 1,709,000 | 1,516,000 | 5,126,000 | 4,547,000 |
| Interest cost | 1,890,000 | 1,884,000 | 5,672,000 | 5,653,000 |
| Expected return on plan assets | (1,843,000) | (1,644,000) | (5,530,000) | (4,933,000) |
| Transition obligation, net | 0 | 0 | 0 | 0 |
| Prior service costs | 15,000 | 1,000 | 44,000 | 4,000 |
| Actuarial loss, net | 1,355,000 | 1,341,000 | 4,065,000 | 4,024,000 |
| Net periodic cost before regulatory adjustment | 3,126,000 | 3,098,000 | 9,377,000 | 9,295,000 |
| Regulatory adjustment | (203,000) | (212,000) | (609,000) | (1,726,000) |
| Net periodic cost | 2,923,000 | 2,886,000 | 8,768,000 | 7,569,000 |
|
Post-Retirement Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 507,000 | 514,000 | 1,521,000 | 1,543,000 |
| Interest cost | 1,502,000 | 1,575,000 | 4,505,000 | 4,723,000 |
| Expected return on plan assets | (1,673,000) | (1,373,000) | (5,018,000) | (4,118,000) |
| Transition obligation, net | 81,000 | 978,000 | 244,000 | 2,934,000 |
| Prior service costs | 631,000 | 631,000 | 1,893,000 | 1,893,000 |
| Actuarial loss, net | 281,000 | 376,000 | 843,000 | 1,127,000 |
| Net periodic cost before regulatory adjustment | 1,329,000 | 2,701,000 | 3,988,000 | 8,102,000 |
| Regulatory adjustment | 717,000 | (261,000) | 2,151,000 | (12,000) |
| Net periodic cost | 2,046,000 | 2,440,000 | 6,139,000 | 8,090,000 |
|
Post-Retirement Benefits [Member] | Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 52,000 | 48,000 | 155,000 | 144,000 |
| Interest cost | 103,000 | 103,000 | 309,000 | 308,000 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Transition obligation, net | 0 | 14,000 | 0 | 43,000 |
| Prior service costs | 0 | 0 | 0 | 0 |
| Actuarial loss, net | 66,000 | 58,000 | 199,000 | 175,000 |
| Net periodic cost before regulatory adjustment | 221,000 | 223,000 | 663,000 | 670,000 |
| Regulatory adjustment | 0 | 0 | 0 | 0 |
| Net periodic cost | $ 221,000 | $ 223,000 | $ 663,000 | $ 670,000 |
| X | ||||||||||
|
- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the transition obligation or asset recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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.
|
|
Commitments And Contingencies (Details) (USD $)
|
9 Months Ended |
|---|---|
|
Sep. 30, 2013
States
|
|
| Environmental Projects [Abstract] | |
| Environmental upgrades jointly owned utility plant entity share | $ 610,000,000 |
| Environmental upgrades jointly owned utility plant | 1,200,000,000 |
| Air Emissions [Abstract] | |
| Estimated cost to comply with environmental regulation | 17,000,000 |
| Number of states required to comply with regulations | 28 |
| EPA Consent Decree [Abstract] | |
| Preliminary estimate of the cost of selective catalytic reduction (SCR) equipment | $ 240,000,000 |
|
2011 Through 2015 Generation Capacity Peak Demand [Member]
|
|
| Renewable Energy Standard [Abstract] | |
| Renewable energy generation capacity, percentage | 10.00% |
|
2016 Through 2019 Generation Capacity Peak Demand [Member]
|
|
| Renewable Energy Standard [Abstract] | |
| Renewable energy generation capacity, percentage | 15.00% |
|
2020 And Thereafter Generation Capacity Peak Demand [Member]
|
|
| Renewable Energy Standard [Abstract] | |
| Renewable energy generation capacity, percentage | 20.00% |
|
Potential GHG Emissions Restrictions 1 [Member]
|
|
| Greenhouse Gases [Abstract] | |
| GHG emission | 75,000 |
|
Potential GHG Emissions Restrictions 2 [Member]
|
|
| Greenhouse Gases [Abstract] | |
| GHG emission | 100,000 |
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The total amount of environmental upgrades at a jointly owned utility plant. No definition available.
|
| X | ||||||||||
|
- Definition
Environmental Upgrades Jointly Owned Utility Plant Entity Share No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Estimated Cost to Comply with Environmental Regulation No definition available.
|
| X | ||||||||||
|
- Definition
The estimated cost to install environmental equipment on a power plant. No definition available.
|
| X | ||||||||||
|
- Definition
GHG Emission No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Number of States Required to Comply with Regulations No definition available.
|
| X | ||||||||||
|
- Definition
Renewable Energy Generation Capacity No definition available.
|
| X | ||||||||||
|
- Details
|
|
Common Stock Common Stock (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
9 Months Ended |
|---|---|
|
Sep. 30, 2013
months
|
|
| Forward Contract Indexed To Issuers Equity, Indexed Shares For Period | 2.5 |
| Forward Contract Indexed to Issuer's Equity, Settlement Period | 18 |
| Forward Contract Indexed to Issuer's Equity, Indexed Shares | 12.2 |
| Forward Contract Indexed to Issuer's Equity, Estimated Proceeds | $ 362.7 |
| Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 29.72 |
| Forward Sale Agreement, Maximum Amount Authorized | $ 500.0 |
| Forward Sale Agreement, Maximum Shares Authorized | 25.0 |
| Commissions Paid, Percentage of Sales Price of Shares Sold | 1.00% |
|
Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member]
|
|
| Forward Contract Indexed to Issuer's Equity, Shares | 8.9 |
| Price Per Share Of Shares Borrowed Under Forward Contracts | $ 31.15 |
| Forward Contract Indexed to Issuer's Equity, Settlement Period | 24 |
| Commissions Paid, Percentage of Sales Price of Shares Sold | 3.50% |
|
Over Allotment [Member] | Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member]
|
|
| Forward Contract Indexed to Issuer's Equity, Shares | 0.9 |
|
Forward Sale Agreement Entered in September Two Thousand And Thriteen [Member] | Base Allotment [Member]
|
|
| Forward Contract Indexed to Issuer's Equity, Shares | 8.0 |
|
Forward Sale Agreement Entered in April Two Thousand And Ten And March Two Thousand And Thriteen [Member]
|
|
| Forward Contract Indexed to Issuer's Equity, Indexed Shares | 4.2 |
| X | ||||||||||
|
- Definition
The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of issuer's shares to which the forward contract is indexed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Commissions Paid, Percentage of Sales Price of Shares Sold No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Estimated Proceeds No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed To Issuers Equity,Indexed Shares For Period No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Settlement Period No definition available.
|
| X | ||||||||||
|
- Definition
Forward Sale Agreement, Maximum Amount Authorized No definition available.
|
| X | ||||||||||
|
- Definition
Forward Sale Agreement, Maximum Shares Authorized No definition available.
|
| X | ||||||||||
|
- Definition
Price Per Share Of Shares Borrowed Under Forward Contracts No definition available.
|
|
Variable Interest Entities (Narrative) (Details) (USD $)
|
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
|
| Variable Interest Entity [Line Items] | ||
| Deconsolidation of variable interest entity | $ 14,282,000 | $ 0 |
| Gain or loss upon initial consolidation of VIEs | 0 | |
|
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 | |
|
Railroad Transportation Equipment [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Agreement expiration date | May 01, 2013 | |
| Gain or loss upon deconsolidation of VIE | 0 | |
|
Railroad Transportation Equipment 2 [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Agreement expiration date | Nov. 01, 2014 | |
|
Variable Interest Entity, Primary Beneficiary [Member]
|
||
| Variable Interest Entity [Line Items] | ||
| Decrease in property, plant and equipment of VIE due to deconsolidation of VIE | $ 14,300,000 | |
| X | ||||||||||
|
- Definition
The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
|
| X | ||||||||||
|
- Definition
The gain (loss) recognized on initial consolidation of a variable interest entity (VIE) when the VIE is not a business (as defined). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
|
|
Variable Interest Entities (Assets And Liabilities In Relation To VIEs) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
|
Dec. 31, 2012
|
||||||
|---|---|---|---|---|---|---|---|---|
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | $ 7,350,935 | $ 7,013,765 | ||||||
| Current maturities of long-term debt | 250,000 | 0 | ||||||
| Accrued interest | 65,817 | [1] | 77,891 | [1] | ||||
| Long-term debt, net | 2,968,797 | 2,819,271 | ||||||
|
Variable Interest Entity, Primary Beneficiary [Member]
|
||||||||
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | 299,312 | 321,975 | ||||||
| Regulatory assets | 6,540 | [2] | 5,810 | [2] | ||||
| Current maturities of long-term debt | 27,764 | 25,942 | ||||||
| Accrued interest | 230 | [1] | 3,948 | [1] | ||||
| Long-term debt, net | $ 195,074 | $ 222,743 | ||||||
|
||||||||
| X | ||||||||||
|
- Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|