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Document and Entity Information Document
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6 Months Ended | |
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Jun. 30, 2012
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Jul. 31, 2012
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| Entity Information [Line Items] | ||
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Jun. 30, 2012 | |
| Document Fiscal Year Focus | 2012 | |
| Document Fiscal Period Focus | Q2 | |
| 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 | 126,315,391 |
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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 after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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
Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. 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
Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total of all Liabilities and Stockholders' Equity items (or Partners' Capital, as applicable), 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
Total obligations incurred as part of normal operations that is expected to be repaid beyond the following twelve months or one business cycle. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Carrying amount of long-term debt, net of 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
Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount, net of accumulated depreciation, depletion and amortization, 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. 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 |
Jun. 30, 2012
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Dec. 31, 2011
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| Allowance for doubtful accounts | $ 4,919 | $ 7,384 |
| Preferred stock, par value | $ 100 | $ 100 |
| Preferred stock, shares authorized | 600,000 | 600,000 |
| Preferred stock, shares issued | 0 | 214,363 |
| Preferred Stock, shares outstanding | 0 | 214,363 |
| Common stock, par value | $ 5 | $ 5 |
| Common stock, shares authorized | 275,000,000 | 275,000,000 |
| Common stock, shares issued | 126,223,848 | 125,698,396 |
| Common stock, shares outstanding | 126,223,848 | 125,698,396 |
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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 of common stock per share; generally not indicative of the fair market value per share. 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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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) 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 nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Consolidated Statements Of Income (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| REVENUES | $ 566,262 | $ 524,892 | $ 1,041,940 | $ 1,006,611 |
| OPERATING EXPENSES: | ||||
| Fuel and purchased power | 147,680 | 152,973 | 275,334 | 287,157 |
| Operating and maintenance | 156,470 | 137,254 | 312,514 | 274,606 |
| Depreciation and amortization | 66,299 | 71,089 | 139,579 | 141,348 |
| Selling, general and administrative | 62,711 | 55,970 | 110,046 | 104,734 |
| Total Operating Expenses | 433,160 | 417,286 | 837,473 | 807,845 |
| INCOME FROM OPERATIONS | 133,102 | 107,606 | 204,467 | 198,766 |
| OTHER INCOME (EXPENSE): | ||||
| Investment (losses) earnings | (598) | 1,374 | 3,727 | 3,342 |
| Other income | 7,537 | 2,557 | 21,127 | 4,806 |
| Other expense | (2,416) | (3,113) | (7,969) | (8,482) |
| Total Other Income (Expense) | 4,523 | 818 | 16,885 | (334) |
| Interest expense | 44,823 | 43,300 | 86,869 | 86,838 |
| INCOME BEFORE INCOME TAXES | 92,802 | 65,124 | 134,483 | 111,594 |
| Income tax expense | 28,340 | 19,599 | 40,783 | 33,112 |
| NET INCOME | 64,462 | 45,525 | 93,700 | 78,482 |
| Less: Net income attributable to noncontrolling interests | 1,728 | 1,396 | 3,442 | 2,770 |
| NET INCOME ATTRIBUTABLE TO WESTAR ENERGY, INC. | 62,734 | 44,129 | 90,258 | 75,712 |
| Preferred dividends | 1,373 | 242 | 1,616 | 485 |
| NET INCOME ATTRIBUTABLE TO COMMON STOCK | $ 61,361 | $ 43,887 | $ 88,642 | $ 75,227 |
| BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO WESTAR ENERGY | $ 0.48 | $ 0.38 | ||
| Basic earnings per common share | $ 0.48 | $ 0.38 | $ 0.70 | $ 0.66 |
| Diluted earnings per common share | $ 0.48 | $ 0.38 | $ 0.70 | $ 0.65 |
| Weighted average equivalent common shares outstanding - basic | 126,637,067 | 114,908,123 | 126,566,071 | 114,396,909 |
| DIVIDENDS DECLARED PER COMMON SHARE | $ 0.33 | $ 0.32 | $ 0.66 | $ 0.64 |
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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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| X | ||||||||||
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- Definition
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period 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 or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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. No definition available.
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate amount of income 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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| X | ||||||||||
|
- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- 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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| X | ||||||||||
|
- Details
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| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| 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
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Discloses the amount of operating expense for the period for routine plant maintenance, repairs and operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fuel and purchased power expense incurred that are directly related to goods produced and sold. No definition available.
|
|
Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: | ||
| Net income | $ 93,700 | $ 78,482 |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 139,579 | 141,348 |
| Amortization of nuclear fuel | 9,026 | 5,913 |
| Amortization of deferred regulatory gain from sale-leaseback | (2,748) | (2,748) |
| Amortization of corporate-owned life insurance | 10,921 | 12,041 |
| Non-cash compensation | 3,738 | 4,889 |
| Net changes in energy marketing assets and liabilities | (425) | 417 |
| Net deferred income taxes and credits | 33,586 | 26,645 |
| Stock-based compensation excess tax benefits | (1,498) | (727) |
| Allowance for equity funds used during construction | (6,778) | (3,421) |
| Changes in working capital items: | ||
| Accounts receivable | (51,055) | (44,249) |
| Fuel inventory and supplies | (26,830) | (16,682) |
| Prepaid expenses and other | 15,255 | (28,608) |
| Accounts payable | (8,741) | 17,013 |
| Accrued taxes | 16,276 | 10,173 |
| Other current liabilities | (59,356) | (85,444) |
| Changes in other assets | (40,100) | (13,673) |
| Changes in other liabilities | (21,371) | (29,922) |
| Cash Flows from Operating Activities | 103,179 | 71,447 |
| CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: | ||
| Additions to property, plant and equipment | (417,617) | (345,550) |
| Purchase of securities within trusts | (16,817) | (34,560) |
| Sale of securities within trusts | 18,040 | 33,821 |
| Proceeds from trust | 1,183 | 0 |
| Investment in corporate-owned life insurance | (18,167) | (18,845) |
| Proceeds from investment in corporate-owned life insurance | 16,330 | 744 |
| Proceeds from federal grant | 3,289 | 3,746 |
| Investment in affiliated company | (4,505) | (909) |
| Investment in non-utility investments | (302) | 0 |
| Other investing activities | (1,224) | 2,354 |
| Cash Flows used in Investing Activities | (419,790) | (359,199) |
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Short-term debt, net | 62,107 | 242,091 |
| Proceeds from long-term debt | 541,504 | 0 |
| Retirements of long-term debt | (220,563) | (191) |
| Repayment of capital leases | (1,287) | (931) |
| Borrowings against cash surrender value of corporate-owned life insurance | 63,287 | 64,875 |
| Repayment of borrowings against cash surrender value of corporate-owned life insurance | (18,252) | (3,020) |
| Stock-based compensation excess tax benefits | 1,498 | 727 |
| Preferred stock redemption | (22,567) | 0 |
| Issuance of common stock | 3,697 | 69,220 |
| Distributions to shareholders of noncontrolling interests | (3,252) | (1,916) |
| Cash dividends paid | (78,710) | (67,846) |
| Cash Flows from Financing Activities | 319,726 | 292,106 |
| NET INCREASE IN CASH AND CASH EQUIVALENTS | 3,115 | 4,354 |
| CASH AND CASH EQUIVALENTS: | ||
| Beginning of period | 3,539 | 928 |
| End of period | 6,654 | 5,282 |
|
Variable Interest Entity [Member]
|
||
| CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: | ||
| Retirements of long-term debt | $ (7,736) | $ (10,903) |
| 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. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The net amount of deferred income taxes and income tax credits less the tax benefit from exercise of stock options. 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 excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) increases (decreases) net cash provided by financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified equity-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) reduces (increases) net cash provided by operating activities. 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 net cash from (used in) the entity's financing activities, excluding cash flows derived by the entity from its discontinued operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of net cash from (used in) the entity's investing activities, excluding cash flows derived by the entity from its discontinued operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of net cash from (used in) the entity's continuing operations, excluding cash flows derived by the entity from its discontinued operations. 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
The cash outflow from purchases 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 other investments held by the entity for investment purposes not otherwise defined in the taxonomy. 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 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 net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell energy at some future point, held at each balance sheet date, that was included in earnings for the period. 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
Cash inflow of proceeds from trust 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, 2010 | $ 2,410,373 | $ 21,436 | $ 560,640 | $ 1,398,580 | $ 423,647 | $ 6,070 |
| Beginning Balance (Shares) at Dec. 31, 2010 | 214,363 | 112,128,068 | ||||
| Net income | 78,482 | 0 | 0 | 0 | 75,712 | 2,770 |
| Issuance of stock (shares) | 0 | 3,589,277 | ||||
| Issuance of stock | 79,048 | 0 | 17,946 | 61,102 | 0 | 0 |
| Preferred dividends | (485) | 0 | 0 | 0 | (485) | 0 |
| Dividends on common stock | (73,601) | 0 | 0 | 0 | (73,601) | 0 |
| Transfer from temporary equity | 3,465 | 0 | 0 | 3,465 | 0 | 0 |
| Amortization of restricted stock | 4,267 | 0 | 0 | 4,267 | 0 | 0 |
| Stock compensation and tax benefit | (8,924) | 0 | 0 | (8,924) | 0 | 0 |
| Distributions to shareholders of noncontrolling interests | (1,916) | 0 | 0 | 0 | 0 | (1,916) |
| Ending Balance at Jun. 30, 2011 | 2,490,709 | 21,436 | 578,586 | 1,458,490 | 425,273 | 6,924 |
| Ending Balance (Shares) at Jun. 30, 2011 | 214,363 | 115,717,345 | ||||
| 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 | 93,700 | 0 | 0 | 0 | 90,258 | 3,442 |
| Issuance of stock (shares) | 0 | 525,452 | ||||
| Issuance of stock | 14,901 | 0 | 2,627 | 12,274 | 0 | 0 |
| Stock redemption (shares) | (214,363) | 0 | ||||
| Stock redemption | (21,436) | (21,436) | 0 | 0 | 0 | 0 |
| Preferred dividends | (1,616) | 0 | 0 | 0 | (1,616) | 0 |
| Dividends on common stock | (84,138) | 0 | 0 | 0 | (84,138) | 0 |
| Amortization of restricted stock | 3,004 | 0 | 0 | 3,004 | 0 | 0 |
| Stock compensation and tax benefit | (7,790) | 0 | 0 | (7,790) | 0 | 0 |
| Distributions to shareholders of noncontrolling interests | (3,252) | 0 | 0 | 0 | 0 | (3,252) |
| Ending Balance at Jun. 30, 2012 | $ 2,794,114 | $ 0 | $ 631,119 | $ 1,646,991 | $ 505,720 | $ 10,284 |
| Ending Balance (Shares) at Jun. 30, 2012 | 0 | 126,223,848 |
| 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
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during 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 | ||||||||||
|
- 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 and outstanding as of the balance sheet date. 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
Change in the value of each type or class of stock classified as temporary equity during the period. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents (i) the amount of share-based compensation recognized during the period, that is, the amount recognized as expense in the income statement, (ii) treasury stock reissued upon exercise of stock options and (iii) tax effect on stock compensation. No definition available.
|
|
Description Of Business
|
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| 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 691,000 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
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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 2011 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 valuation of commodity contracts, depreciation, unbilled revenue, valuation of investments, valuation of our energy marketing portfolio, 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 six months ended June 30, 2012, 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 account to effect the redemption of all of Westar Energy's preferred stock. See Note 12, "Common and Preferred Stock," for additional information regarding the preferred stock redemption. 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, RSUs with forfeitable rights to dividend equivalents and stock options. 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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Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management
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| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management | FINANCIAL AND DERIVATIVE INSTRUMENTS, TRADING SECURITIES, ENERGY MARKETING AND RISK MANAGEMENT Values of Financial and Derivative Instruments GAAP establishes a hierarchal 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 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 the 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 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. Energy marketing contracts can be exchange-traded or traded over-the-counter (OTC). Fair value measurements of exchange-traded contracts typically utilize quoted prices in active markets. OTC contracts are valued using market transactions and other market evidence whenever possible, including market-based inputs to models, model calibration to market clearing transactions or alternative pricing sources with reasonable levels of price transparency. Valuation models require a variety of inputs, including contractual terms, market prices, yield curves, credit curves, nonperformance risk, measures of volatility and correlations of such inputs. Certain OTC contracts trade in less liquid markets with limited pricing information and the determination of fair value for these derivatives is inherently more subjective. In these situations, estimates by management are a significant input. Our risk management department, which reports to the Chief Financial Officer, has established valuation processes and procedures to ensure that the valuation methodologies for energy marketing transactions are fair and consistent. Methodologies are periodically reviewed and tested to ensure they are representative of the current market dynamics. See "—Recurring Fair Value Measurements" and "—Derivative Instruments" below for additional information. 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 and liabilities that are measured at fair value.
We do not offset the fair value of energy marketing contracts executed with the same counterparty. As of June 30, 2012, we had no right to reclaim cash collateral and had recorded $1.4 million for our obligation to return cash collateral. As of December 31, 2011, we had no right to reclaim cash collateral and had recorded $2.9 million for our obligation to return cash collateral. The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and six months ended June 30, 2012.
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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 six months ended June 30, 2011.
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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 six months ended June 30, 2012 and 2011, attributed to level 3 assets and liabilities.
_______________ (a)Unrealized gains and losses included in earnings are reported in revenues. (b)Includes changes in the fair value of certain fuel supply and electricity contracts.
_______________ (a)Unrealized gains and losses included in earnings are reported in revenues. (b)Includes changes in the fair value of certain fuel supply and electricity contracts. Our level 3 investments require unobservable quantitative inputs to measure fair value. The following table summarizes the quantitative inputs and assumptions for our level 3 investments not measured at net asset value.
Our fair value measurement of our energy marketing contracts is sensitive to level 3 fair value inputs. Increases or decreases to one unobservable input may magnify or mitigate the impact of other inputs. Holding all other inputs constant, an increase (decrease) in a significant unobservable input would typically impact our fair value measurement as follows.
Some of our investments in the nuclear decommissioning trust (NDT) and our trading securities portfolio are measured at net asset value, do not have readily determinable fair values and are either with investment companies or companies that follow accounting guidance consistent with investment companies. In certain situations these investments may have redemption restrictions. The following table provides additional information on these investments.
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Derivative Instruments Cash Flow Hedges We entered into treasury yield hedge transactions to hedge our interest rate risk associated with a $125.0 million portion of a forecasted issuance of fixed rate debt. These transactions were designated and qualified as cash flow hedges and measured at fair value by estimating the net present value of a series of payments using market-based models with observable inputs such as the spread between the 30-year U.S. Treasury bill yield and the contracted, fixed yield. As a result of regulatory accounting treatment, we report the effective portion of the gains or losses on these derivative instruments as a regulatory liability or regulatory asset and amortize such amounts to interest expense over the term of the related debt. As of December 31, 2011, we had recorded $34.0 million in other current liabilities on our consolidated balance sheet to reflect the fair value of the treasury yield hedge transactions and $33.8 million in long-term regulatory assets to reflect the effective portion. During the first quarter of 2012, we settled the treasury yield hedge transactions for a cost of $29.7 million, which will be amortized to interest expense over the 30-year term of the debt issued on March 1, 2012. See Note 6, "Debt Financing," for additional information regarding the debt issuance. Commodity Contracts We engage in both financial and physical trading with the goal of managing our commodity price risk, enhancing system reliability and increasing profits. We trade electricity and other energy-related products using a variety of financial instruments, which may include futures contracts, options, swaps and physical commodity contracts. We report energy marketing contracts representing unrealized gain positions as assets; energy marketing contracts representing unrealized loss positions are reported as liabilities. With the exception of certain fuel supply and electricity contracts, which we record as regulatory assets or regulatory liabilities, we include the change in the fair value of energy marketing contracts in revenues on our consolidated statements of income. The following table presents the fair value of commodity derivative instruments reflected on our consolidated balance sheets.
The following table presents how changes in the fair value of commodity derivative instruments increase (decrease) line items on our condensed consolidated financial statements for the three and six months ended June 30, 2012 and 2011.
As of June 30, 2012, and December 31, 2011, we had under contract the following commodity derivatives.
Net open positions exist, or are established, due to the origination of new transactions and our assessment of, and response to, changing market conditions. To the extent we have net open positions, we are exposed to the risk that changing market prices could have a material impact on our consolidated financial results. Energy Marketing Activities Within our energy trading portfolio, we may establish certain positions intended to economically hedge a portion of physical sale or purchase contracts and we may enter into certain positions attempting to take advantage of market trends and conditions. We use the term economic hedge to mean a strategy intended to manage risks of volatility in prices or rate movements on selected assets, liabilities or anticipated transactions by creating a relationship in which gains or losses on derivative instruments are expected to offset the losses or gains on the assets, liabilities or anticipated transactions exposed to such market risks. 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, costs of fuel for our generating plants and our participation in energy markets. We strive to manage our customers' and our exposure to these market risks through regulatory, operating and financing activities and, when we deem appropriate, we economically hedge a portion of these risks through the use of derivative financial instruments for non-trading purposes. Interest Rate Risk We have entered into numerous fixed and variable rate debt obligations. 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. Credit Risk In addition to commodity price risk, we are exposed to credit risks associated with the financial condition of counterparties, product location (basis) pricing differentials, physical liquidity constraints and other risks. Declines in the creditworthiness of our counterparties could have a material impact on our overall exposure to credit risk. We maintain credit policies with regard to our counterparties intended to reduce our overall credit risk exposure to a level we deem acceptable and include the right to offset derivative assets and liabilities by counterparty. We have derivative instruments with commodity exchanges and other counterparties that do not contain objective credit-risk-related contingent features. However, certain of our derivative instruments contain collateral provisions subject to credit agency ratings of our senior unsecured debt. If our senior unsecured debt ratings were to decrease or fall below investment grade, the counterparties to the derivative instruments, pursuant to the provisions, could require collateralization on derivative instruments. The aggregate fair value of all derivative instruments with objective credit risk-related contingent features that were in a liability position as of June 30, 2012, and December 31, 2011, was $2.7 million and $3.1 million, respectively, for which we had posted $0.5 million of collateral, including independent amounts, and no collateral, respectively. If all credit-risk-related contingent features underlying these agreements had been triggered as of June 30, 2012, and December 31, 2011, we would have been required to provide to our counterparties $0.7 million and $0.5 million, respectively, of additional collateral after taking into consideration the offsetting impact of derivative assets and net accounts receivable. |
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| 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 and six months ended June 30, 2012, we recorded an unrealized loss of $1.8 million and an unrealized gain of $1.8 million, respectively, on these securities. We recorded unrealized gains of $0.6 million and $2.5 million, respectively, during the three and six months ended June 30, 2011. Available-for-Sale Securities We hold investments in equity, debt and real estate securities 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 June 30, 2012, and December 31, 2011. Under normal circumstances, the core bond fund will invest the majority of its assets in investment grade fixed income securities; however, a portion of its assets may be invested in non-investment grade securities. As of June 30, 2012, the fair value of available-for-sale debt securities in the core, high-yield and emerging market bond funds was $41.7 million. As of June 30, 2012, the NDT did not have investments in debt securities outside of investment funds. Using the specific identification method to determine cost, we realized gains on our available-for-sale securities of $0.4 million and $0.6 million, respectively, during the three and six months ended June 30, 2012. During the three and six months ended June 30, 2011, we realized gains of $0.3 million and $1.3 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 June 30, 2012, and December 31, 2011.
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 June 30, 2012, and December 31, 2011.
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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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Rate Matters And Regulation
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Jun. 30, 2012
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| Regulated Operations [Abstract] | |
| Rate Matters And Regulation | RATE MATTERS AND REGULATION KCC Proceedings On May 29, 2012, the Kansas Corporation Commission (KCC) issued an order allowing us to adjust our prices to include costs associated with investments in environmental projects during 2011. The new prices were effective June 1, 2012, and are expected to increase our annual retail revenues by approximately $19.5 million. On April 18, 2012, the KCC issued an order expected to increase our annual retail revenues by approximately $50.0 million. In addition, we revised our depreciation rates to reflect changes in the estimated useful lives of some of our depreciable assets. The change in estimate will decrease annual depreciation expense by $43.6 million. Further, we increased our estimate of amounts collected, but not yet spent, to dispose of plant assets that do not represent legal retirement obligations by $57.9 million. The new prices were effective April 27, 2012. The KCC also approved our request to file an abbreviated rate review within 12 months of this order to update our prices to include capital costs related to environmental projects at La Cygne Generating Station (La Cygne). Effective April 6, 2012, the KCC authorized an increase in our prices to reflect adjustments to our transmission formula rate as discussed below. The new prices are expected to increase our annual retail revenues by approximately $36.7 million. We expect the KCC to issue a final order on our request by October 2012. FERC Proceedings Our transmission formula rate that includes projected 2012 transmission capital expenditures and operating costs was effective January 1, 2012, and is expected to increase annual transmission revenues by approximately $38.2 million. This updated rate provided the basis for our request with the KCC to adjust our retail prices to include updated transmission costs as noted above. |
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The entire disclosure for public utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt
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Jun. 30, 2012
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| Long-term Debt, Unclassified [Abstract] | |
| Debt Financing | DEBT FINANCING On May 17, 2012, Westar Energy issued $300.0 million principal amount of first mortgage bonds at a discount yielding 4.157%, bearing stated interest at 4.125% and maturing on March 1, 2042. These bonds constitute a further issuance of the $250.0 million principal amount of first mortgage bonds issued on March 1, 2012, at a discount yielding 4.13%, bearing stated interest at 4.125% and maturing on March 1, 2042. Proceeds from these issuances of $541.5 million were used to repay short-term debt, which was used to purchase capital equipment, to redeem bonds, and for working capital and general corporate purposes. On May 15, 2012, Westar Energy redeemed $150.0 million aggregate principal amount of 6.10% first mortgage bonds. Additionally, on March 30, 2012, Westar Energy redeemed $57.2 million aggregate principal amount of 5.00% pollution control bonds and KGE redeemed $13.3 million aggregate principal amount of 5.10% pollution control bonds. The bonds were redeemed using short-term debt. |
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Taxes
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Jun. 30, 2012
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| Income Tax Disclosure [Abstract] | |
| Taxes | TAXES We recorded income tax expense of $28.3 million with an effective income tax rate of 31% for the three months ended June 30, 2012, and income tax expense of $19.6 million with an effective income tax rate of 30% for the same period of 2011. We recorded income tax expense of $40.8 million with an effective income tax rate of 30% for the six months ended June 30, 2012, and income tax expense of $33.1 million with an effective income tax rate of 30% for the same period of 2011. In May 2012, the Internal Revenue Service commenced examination of our 2010 federal income tax return and the amended federal income tax returns we filed for years 2007, 2008 and 2009. We have extended the statute of limitation for year 2008 until December 31, 2013. As of June 30, 2012, and December 31, 2011, our liability for unrecognized income tax benefits was $2.3 million and $2.5 million, respectively. The net decrease in the liability for unrecognized income tax benefits was largely attributable to tax positions taken with respect to the capitalization of plant related expenditures. We do not expect significant changes in this liability in the next 12 months. As of June 30, 2012, and December 31, 2011, we had $0.3 million and $0.2 million, respectively, accrued for interest on our liability related to unrecognized income tax benefits. We accrued no penalties at either June 30, 2012, or December 31, 2011. As of June 30, 2012, and December 31, 2011, 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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Commitments And Contingencies
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Jun. 30, 2012
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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 pollutants 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 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 six criteria pollutants considered harmful to public health and the environment, including PM, NOx, CO and SO2, which result from coal combustion. Areas meeting the NAAQS are designated attainment areas while those that do not meet the NAAQS are considered nonattainment areas. Each state must develop a plan to bring nonattainment areas into compliance with the NAAQS. NAAQS must be reviewed by the EPA at five-year intervals. In 2009, KDHE proposed to designate portions of the Kansas City area nonattainment for the 8-hour ozone standard, which has the potential to impact our operations. Recently the Wichita area exceeded the 8-hour ozone standard and may be designated nonattainment in the future. 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 interpretation of 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 costs associated with our approximately $600.0 million capital investment for environmental upgrades at La Cygne. We must file for a general review of our rates or an abbreviated rate review with the KCC in order to collect such costs. As previously discussed, the KCC approved our request to file an abbreviated rate review within 12 months of its April 18, 2012, order to update our prices to include capital costs related to environmental projects at La Cygne. In order to change our prices to collect increased operating and maintenance costs, we must also 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 December 2011, the EPA published Mercury and Air Toxics Standards (MATS) for power plants, which replaces the prior federal Clean Air Mercury Rule (CAMR) and requires significant reductions in mercury, acid gases and other emissions. Companies impacted by the new standards will have up to three years, or four years with approval from a state environmental regulatory agency, and in certain limited circumstances up to five years, to comply. We have obtained approval by our state environmental regulatory agency and expect to be compliant with the new standards within four years. We continue to evaluate the new standards and believe that our related investment could be approximately $40.0 million. In July 2011, the EPA finalized the Cross-State Air Pollution Rule (CSAPR) which requires 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 scheduled to begin January 1, 2012, with further reductions required beginning January 1, 2014. The EPA issued federal implementation plans for each state covered by CSAPR, but would allow these states to submit their own implementation plans starting as early as 2013. In October 2011, we and numerous other parties filed legal challenges to CSAPR in the U.S. Court of Appeals for the District of Columbia Circuit. In December 2011, the EPA published a final supplemental rule to CSAPR requiring five states, including Missouri and Oklahoma, to make summertime reductions in NOx emissions under an ozone-season control program implemented under CSAPR. Reductions in ozone-season NOx under this rule were scheduled to begin May 1, 2012. Although Kansas was included in the original proposed rule, the final supplemental rule instead calls for the EPA to revisit Kansas' status under this supplemental rule once Kansas submits an ozone state implementation plan, which must occur within 12 months from the date the EPA issues a state implementation request to Kansas. The EPA has not yet issued such a request to Kansas. On December 30, 2011, the U.S. Court of Appeals for the District of Columbia Circuit issued its ruling to stay CSAPR, including the final supplemental rule, pending judicial review, which delays CSAPR's implementation date beyond January 1, 2012. On April 13, 2012, the court heard arguments to this case. As the outcome of the judicial review and any other possible legal or Congressional challenges are uncertain, we are unable to determine what impact CSAPR may ultimately have on our operations and consolidated financial results, but it could be material. Greenhouse Gases Under EPA regulations known as the Tailoring Rule, the EPA is regulating greenhouse gas (GHG) emissions from certain stationary sources. The regulations are being implemented pursuant to two federal Clean Air Act programs: the Title V Operating Permit program and the program requiring a permit if undergoing construction or major modifications, which is referred to as the Prevention of Significant Deterioration program (PSD). Obligations relating to Title V permits include recordkeeping and monitoring requirements. With respect to PSD permits, 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), are required to implement best available control technology (BACT). 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 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. In years 2011 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. We met the 2011 requirement using approximately 300 megawatts (MW) of qualifying wind generation facilities along with renewable energy credits. Beginning in late 2012, we will purchase under 20-year supply contracts the renewable energy produced from an additional approximately 370 MW of wind generation, which will allow us to satisfy the net renewable generation requirement through 2015 and contribute toward meeting the increased requirements beginning in 2016. If we are unable to meet future requirements, our operations and consolidated financial results could be adversely impacted. Manufactured Gas Sites We have been identified as being partially responsible for remediating a number of former manufactured gas sites located in Kansas. We and KDHE entered into a consent agreement governing all future work at these sites. Under terms of the consent agreement, we agreed to investigate and, if necessary, remediate these sites. Pursuant to an environmental indemnity agreement, ONEOK Inc. (ONEOK) assumed total liability for remediation of seven sites and we share liability for remediation with ONEOK for five sites. Our total liability for the five shared sites is capped at $3.8 million and terminates in November 2012. EPA Consent Decree As part of the settlement of a lawsuit filed by the Department of Justice on behalf of the EPA, we will install selective catalytic reduction equipment (SCR) on one of three Jeffrey Energy Center (JEC) coal units by the end of 2014, which we estimate will cost approximately $240.0 million. Depending on the NOx emission reductions attained by the single SCR and attainable through the installation of other controls on the other two JEC coal units, we may have to install SCR on another JEC unit by the end of 2016, if needed to meet plant-wide NOx reduction targets. We plan to recover the costs to install these systems through our ECRR. Recovery of all or part of such costs remains subject to the approval of our regulators. FERC Investigation A non-public investigation by the Federal Energy Regulatory Commission (FERC) of our use of transmission service between July 2006 and February 2008 remains pending. In May 2009, FERC staff alleged that we improperly used secondary network transmission service to facilitate off-system wholesale power sales in violation of applicable FERC orders and Southwest Power Pool (SPP) tariffs. FERC staff first alleged we received $14.3 million of unjust profits through such activities. We sent a response to FERC staff disputing both the legal basis for its allegations and their factual underpinnings. Based on our response, FERC staff substantially revised downward its preliminary conclusions to allege that we received $3.0 million of unjust profits and failed to pay $3.2 million to the SPP for transmission service. In March 2010, we sent a response to FERC staff disputing its revised conclusions. Following additional communications with FERC staff, FERC staff further revised its preliminary conclusions to allege that we have received $0.9 million of unjust profits and failed to pay $0.8 million to the SPP for transmission service. Although we continue to believe our use of transmission service was in compliance with FERC orders and SPP tariffs, we recorded an estimated liability of $0.5 million as of June 30, 2012, and December 31, 2011, related to the potential settlement of this investigation and the risks of litigating this matter to a final outcome. We are unable to predict the outcome of this investigation or its impact on our consolidated financial results, but an adverse outcome could result in payments for alleged unjust profits and unpaid transmission costs as well as penalties, the amounts of which could be material, and could potentially alter the manner in which we are permitted to buy and sell energy and use transmission service. |
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Legal Proceedings
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Jun. 30, 2012
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| Legal Proceedings [Abstract] | |
| Legal Proceedings | LEGAL PROCEEDINGS We and our subsidiaries are involved in various legal, environmental and regulatory proceedings. We believe that adequate provisions have been made and accordingly believe that the ultimate disposition of such matters will not have a material effect on our consolidated financial results. See Note 5, "Rate Matters and Regulation," and Note 8, "Commitments and Contingencies," for additional information. |
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Employee Benefit Plans
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Jun. 30, 2012
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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.
During the six months ended June 30, 2012 and 2011, we contributed $49.4 million and $41.1 million, respectively, to the Westar Energy pension trust. |
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Wolf Creek Employee Benefit Plans
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Jun. 30, 2012
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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.
During the six months ended June 30, 2012 and 2011, we funded $9.0 million and $7.1 million, respectively, of Wolf Creek's pension plan contribution. |
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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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Common and Preferred Stock
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Jun. 30, 2012
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| Common and Preferred Stock | COMMON AND PREFERRED STOCK Common Stock In May 2012, Westar Energy entered into forward sale transactions with respect to an aggregate of approximately 1.1 million shares of common stock pursuant to an existing forward sale agreement. Westar Energy must settle such transactions within 18 months of the date each transaction was entered. Assuming physical share settlement of the forward sale transactions as of June 30, 2012, Westar Energy would have received aggregate proceeds of approximately $29.3 million based on a forward price of $27.46 per share. Preferred Stock Redemption In May 2012, Westar Energy provided an irrevocable notice of redemption to holders of all of Westar Energy's preferred shares. Accordingly, we reduced preferred equity to zero, recognized the obligation to redeem the preferred shares as a liability, and recognized the redemption premium as a preferred stock dividend during the three months ended June 30, 2012. Payment is due to holders of the preferred shares effective July 1, 2012. The table below shows the redemption amounts for all series of preferred stock.
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Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Jun. 30, 2012
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| Variable Interest Entities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 Under two separate agreements that expire in May 2013 and November 2014, we lease railcars from trusts to transport coal to some of our power plants. The trusts were financed with equity contributions from owner participants and debt issued by the trusts. The trusts were created specifically to purchase the railcars and lease them to us, and do not hold any other assets. We meet the requirements to be considered the primary beneficiary of the trusts. In determining the primary beneficiary of the trusts, we concluded that the activities of the trusts that most significantly impact their 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 trusts that could potentially be significant if the fair value of the railcars at the end of the agreements is greater than the fixed amounts. Our agreements with these trusts also include renewal options during which time we would pay a fixed amount of rent. We have the potential to receive benefits from the trusts during the renewal periods 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 did not record any gain or loss upon initial consolidation of the VIEs. |
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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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Jun. 30, 2012
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| Accounting Policies [Abstract] | |
| 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. |
| 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 valuation of commodity contracts, depreciation, unbilled revenue, valuation of investments, valuation of our energy marketing portfolio, 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. |
| Restricted Cash | Restricted Cash Pursuant to Westar Energy's Articles of Incorporation, Westar Energy deposited cash in a separate account to effect the redemption of all of Westar Energy's preferred stock. |
| Fuel Inventory And Supplies | Fuel Inventory and Supplies We state fuel inventory and supplies at average cost. |
| 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 |
| 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, RSUs with forfeitable rights to dividend equivalents and stock options. We compute the dilutive effect of potential issuances of common shares using the treasury stock method. |
| Supplemental Cash Flow Information | Supplemental Cash Flow Information |
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- Definition
Disclosure of accounting policy for AFUDC (for example, component of PPE, credit to income statement), information regarding the inclusion in rates (only capitalized if its inclusion in rates is probable) and description of AFUDC (for example, represents the cost of capital used during construction). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
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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- Definition
The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy for major classes of inventories, bases of stating inventories (for example, lower of cost or market), methods by which amounts are added and removed from inventory classes (for example, FIFO, LIFO, or average cost), loss recognition on impairment of inventories, and situations in which inventories are stated above cost. If inventory is carried at cost, this disclosure includes the nature of the cost elements included in inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of accounting policy 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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Jun. 30, 2012
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Utility Inventory | Following are the balances for fuel inventory and supplies stated separately.
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| Allowance For Funds Used During Construction | on the accompanying consolidated statements of income as follows:
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| Reconciliation Of Basic And Diluted EPS | The following table reconciles our basic and diluted EPS from net income.
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| Supplemental Cash Flow Information |
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- Definition
Tabular disclosure of supplemental cash flow information for the periods presented. No definition available.
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- Definition
Tabular disclosure of an entity's basic and diluted earnings per share calculations. No definition available.
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- Definition
Tabular disclosure of all information related to inventories for utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of an entity's allowance for funds used during construction. No definition available.
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Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [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 and liabilities 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 six months ended June 30, 2012.
_______________
The following table provides reconciliations of assets and liabilities measured at fair value using significant level 3 inputs for the three and six months ended June 30, 2011.
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| Unrealized Gains And Losses On Financial Statements | The following tables summarize the unrealized gains and losses we recorded on our consolidated financial statements during the three and six months ended June 30, 2012 and 2011, attributed to level 3 assets and liabilities.
_______________ (a)Unrealized gains and losses included in earnings are reported in revenues. (b)Includes changes in the fair value of certain fuel supply and electricity contracts.
_______________ (a)Unrealized gains and losses included in earnings are reported in revenues. (b)Includes changes in the fair value of certain fuel supply and electricity contracts |
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| Fair Value Inputs Assets Quantitative Information [Table Text Block] | The following table summarizes the quantitative inputs and assumptions for our level 3 investments not measured at net asset value.
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| Investments In Financial Instruments | The following table provides additional information on these investments.
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| Fair Value Of Commodity Derivative Instruments | The following table presents the fair value of commodity derivative instruments reflected on our consolidated balance sheets.
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| Changes In The Fair Value Of Commodity Derivative Instruments | The following table presents how changes in the fair value of commodity derivative instruments increase (decrease) line items on our condensed consolidated financial statements for the three and six months ended June 30, 2012 and 2011.
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| Energy Related Products Contracts | As of June 30, 2012, and December 31, 2011, we had under contract the following commodity derivatives.
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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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- Definition
Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tabular disclosure of the notional amounts of outstanding derivative positions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the disclosure regarding the investments in certain entities that calculate net asset value per share that enables users to understand the nature and risks of the investments and whether the investments are probable of being sold at amounts different from net asset value per share. Such disclosure may include (1) the fair value of the investments in the major category, and a description of the significant investment strategies of the investee(s) in the major category; (2) for each major category of investment that includes investments that can never be redeemed with the investees, but the reporting entity receives distributions through the liquidation of the underlying assets of the investees, the reporting entity's estimate of the period of time over which the underlying assets are expected to be liquidated by the investees; (3) the amount of the entity's unfunded commitments related to investments in the major category; (4) a general description of the terms and conditions upon which the investor may redeem investments in the major category; (5) the circumstances in which an otherwise redeemable investment in the major category might not be redeemable; (6) for those otherwise redeemable investments that are restricted from redemption as of the reporting entity's measurement date, the entity's best estimate of when the restriction from redemption might lapse; if an estimate cannot be made, the entity shall disclose that fact and how long the restriction has been in effect; (7) any other significant restriction on the ability to sell investments in the major category at the measurement date; (8) total fair value of held for sale investments and any remaining actions required to complete the sale when the reporting entity determines that it is probable that it will sell the investments for an amount different from net asset value per share; and (9) disclosure of an entity's plans to sell and any remaining actions required to complete the sale when the entity intends to sell a group of investments, but the individual investments to be sold have not been identified. No definition available.
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- Details
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- Definition
Schedule of Carrying Value and Fair Values of Financial Instruments. No definition available.
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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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Jun. 30, 2012
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| Investments [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Costs And Fair Values 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 June 30, 2012, and December 31, 2011.
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| Fair Value And The Gross Unrealized Losses Of The 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 June 30, 2012, and December 31, 2011.
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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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- 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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Employee Benefit Plans (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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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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- 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 Employee Benefit Plans (Tables)
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Jun. 30, 2012
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| Wolf Creek Interim Pension And Post-Retirement Benefit 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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Wolf Creek [Member]
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| Wolf Creek Interim Pension And Post-Retirement Benefit Disclosure [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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- 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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Common and Preferred Stock Common and Preferred Stock (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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| COMMON AND PREFERRED STOCK [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Instruments Not Subject to Mandatory Redemption Disclosure [Table Text Block] | The table below shows the redemption amounts for all series of preferred stock.
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- Definition
Financial Instruments Not Subject to Mandatory Redemption Disclosure [Table Text Block] No definition available.
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Variable Interest Entities (Tables)
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6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2012
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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.
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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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- Details
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Description Of Business (Details)
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6 Months Ended |
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Jun. 30, 2012
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| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Number of customers in Kansas (in customers) | 691,000 |
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- Definition
Number Of Customers Getting Electric Generation, Transmission And Distribution Services No definition available.
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Summary Of Significant Accounting Policies (Fuel Inventory And Supplies) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
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Dec. 31, 2011
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| Public Utilities, Inventory [Line Items] | ||
| Total | $ 256,316 | $ 229,118 |
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Fuel Inventory [Member]
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| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | 115,615 | 86,408 |
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Supplies [Member]
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| Public Utilities, Inventory [Line Items] | ||
| Public Utilitiy Inventory | $ 140,701 | $ 142,710 |
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- Definition
Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- 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 | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Accounting Policies [Abstract] | ||||
| Borrowed funds | $ 2,440 | $ 1,562 | $ 5,959 | $ 3,062 |
| Equity funds | 2,838 | 1,669 | 6,778 | 3,421 |
| Total | $ 5,278 | $ 3,231 | $ 12,737 | $ 6,483 |
| Average AFUDC rates | 4.90% | 4.20% | 5.40% | 4.40% |
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- Details
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- Definition
Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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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- Definition
Amount capitalized of allowance for funds used during construction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Disclosure of the effective rate for the period representing (a) total additions to qualifying regulated assets for allowance for funds used during construction, (b) divided by the sum of debt and equity funds used for 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 | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Accounting Policies [Abstract] | ||||
| Net income | $ 64,462 | $ 45,525 | $ 93,700 | $ 78,482 |
| Less: Income attributable to noncontrolling interests | 1,728 | 1,396 | 3,442 | 2,770 |
| NET INCOME ATTRIBUTABLE TO WESTAR ENERGY, INC. | 62,734 | 44,129 | 90,258 | 75,712 |
| Less: Preferred dividends | 1,373 | 242 | 1,616 | 485 |
| Income from continuing allocated to RSUs | 182 | 19 | 265 | 138 |
| Income from continuing operations attributable to common stock | $ 61,179 | $ 43,868 | $ 88,377 | $ 75,089 |
| Weighted average equivalent common shares outstanding - basic | 126,637,067 | 114,908,123 | 126,566,071 | 114,396,909 |
| RSUs | 190,422 | 182,384 | 155,340 | 169,165 |
| Forward sale agreements | 49,047 | 1,846,084 | 23,128 | 1,779,107 |
| Weighted average equivalent common shares outstanding - diluted | 126,876,536 | 116,936,591 | 126,744,539 | 116,345,181 |
| Basic earnings per common share | $ 0.48 | $ 0.38 | $ 0.70 | $ 0.66 |
| Diluted earnings per common share | $ 0.48 | $ 0.38 | $ 0.70 | $ 0.65 |
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 0 | 0 |
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- Details
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- 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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- Details
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- Definition
Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
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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- 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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| X | ||||||||||
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- 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.
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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
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 | ||||||||||
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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
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- Definition
Earnings distributed and earnings allocated to common stock under the two-class method. No definition available.
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| X | ||||||||||
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- Definition
Additional common shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward sale agreements using the treasury stock method. No definition available.
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Summary Of Significant Accounting Policies (Supplemental Cash Flow Information) (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | |
|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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| Cash Paid For (Received From) | ||
| Interest on financing activities | $ 68,939 | $ 72,225 |
| Income taxes, net of refunds | (4,635) | 1,113 |
| Noncash Investing and Financing Transactions | ||
| Property, plant and equipment additions | 37,736 | 73,989 |
| Issuance of common stock for reinvested dividends and compensation plans | 4,920 | 7,909 |
| Assets acquired through capital leases | 1,543 | 41,901 |
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Variable Interest Entity, Primary Beneficiary [Member]
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| Cash Paid For (Received From) | ||
| Interest on financing activities | $ 8,281 | $ 9,335 |
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- Definition
The increase during the period in capital lease obligations due to entering into new capital leases. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- Definition
The fair value of stock issued in noncash financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Narrative) (Details) (USD $)
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3 Months Ended | ||||
|---|---|---|---|---|---|
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Jun. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2011
Cash Flow Hedging [Member]
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Dec. 31, 2011
Other Current Liabilities [Member]
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Mar. 31, 2012
Cash Flow Hedging [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | |||||
| Obligation to return cash collateral | $ 1,400,000 | $ 2,900,000 | |||
| Notional amount | 125,000,000 | ||||
| Right to reclaim cash collateral | 0 | 0 | |||
| Interest Rate Cash Flow Hedge Liability at Fair Value | 34,000,000 | ||||
| Aggregate fair value of derivative instruments with credit-risk-related contingent features | 2,700,000 | 3,100,000 | |||
| Aggregate fair value of collateral already posted | 500,000 | 0 | |||
| Aggregate fair value additional collateral | 700,000 | 500,000 | |||
| Long-term regulatory assets | 909,488,000 | 922,272,000 | 33,800,000 | ||
| Cash flow hedge settlement cost | $ 29,700,000 | ||||
| X | ||||||||||
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- Definition
The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
|
- Definition
The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Definition
Derivative Instruments Gain Loss Recognized No definition available.
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Carrying Values And Fair Values Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
|
Fixed Rate Debt Member
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | $ 2,702,500 | $ 2,373,063 |
| Fair Value | 3,141,298 | 2,623,993 |
|
Fixed Rate Debt Of Variable Interest Entities [Member]
|
||
| Debt Instrument [Line Items] | ||
| Carrying Value | 268,002 | 275,738 |
| Fair Value | $ 298,832 | $ 306,027 |
| X | ||||||||||
|
- Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Fair Value Of Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Energy Marketing Contracts, Assets | $ 11,428 | $ 15,731 |
| Total Nuclear Decommissioning Trust | 140,741 | 130,270 |
| Total Trading Securities, Assets | 41,696 | 40,201 |
| Total Assets Measured at Fair Value | 193,865 | 186,202 |
| Total Liabilities Measured at Fair Value | 40,378 | |
|
Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 49 | 51 |
| Total Trading Securities, Assets | 0 | 169 |
| Total Assets Measured at Fair Value | 49 | 220 |
| Total Liabilities Measured at Fair Value | 0 | |
|
Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 128,463 | 119,193 |
| Total Trading Securities, Assets | 41,696 | 40,032 |
| Total Assets Measured at Fair Value | 170,942 | 161,626 |
| Total Liabilities Measured at Fair Value | 36,500 | |
|
Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 12,229 | 11,026 |
| Total Trading Securities, Assets | 0 | 0 |
| Total Assets Measured at Fair Value | 22,874 | 24,356 |
| Total Liabilities Measured at Fair Value | 3,878 | |
|
Energy Marketing Contracts [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Energy Marketing Contracts, Assets | 11,428 | 15,731 |
| Energy Marketing Contracts, Liabilities | 4,414 | 6,353 |
|
Energy Marketing Contracts [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Energy Marketing Contracts, Assets | 0 | 0 |
| Energy Marketing Contracts, Liabilities | 0 | 0 |
|
Energy Marketing Contracts [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Energy Marketing Contracts, Assets | 783 | 2,401 |
| Energy Marketing Contracts, Liabilities | 667 | 2,475 |
|
Energy Marketing Contracts [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Energy Marketing Contracts, Assets | 10,645 | 13,330 |
| Energy Marketing Contracts, Liabilities | 3,747 | 3,878 |
|
Treasury Yield Hedges [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Treasury Yield Hedges | 34,025 | |
|
Treasury Yield Hedges [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Treasury Yield Hedges | 0 | |
|
Treasury Yield Hedges [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Treasury Yield Hedges | 34,025 | |
|
Treasury Yield Hedges [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Treasury Yield Hedges | 0 | |
|
Domestic Equity [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 56,865 | 57,117 |
| Total Trading Securities, Assets | 21,520 | 21,175 |
|
Domestic Equity [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | 0 |
|
Domestic Equity [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 52,085 | 53,186 |
| Total Trading Securities, Assets | 21,520 | 21,175 |
|
Domestic Equity [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 4,780 | 3,931 |
| Total Trading Securities, Assets | 0 | 0 |
|
International Equity [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 26,416 | 22,307 |
| Total Trading Securities, Assets | 5,172 | 4,896 |
|
International Equity [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | 0 |
|
International Equity [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 26,416 | 22,307 |
| Total Trading Securities, Assets | 5,172 | 4,896 |
|
International Equity [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | 0 |
|
Core Bonds [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 27,449 | 20,171 |
| Total Trading Securities, Assets | 15,004 | 13,961 |
|
Core Bonds [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | 0 |
|
Core Bonds [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 27,449 | 20,171 |
| Total Trading Securities, Assets | 15,004 | 13,961 |
|
Core Bonds [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | 0 |
|
High-Yield Bonds [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 8,151 | 10,969 |
|
High-Yield Bonds [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
High-Yield Bonds [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 8,151 | 10,969 |
|
High-Yield Bonds [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Emerging Market Bonds [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 6,087 | 5,309 |
|
Emerging Market Bonds [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Emerging Market Bonds [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 6,087 | 5,309 |
|
Emerging Market Bonds [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Combination Debt and Equity Fund [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 8,275 | 7,251 |
|
Combination Debt and Equity Fund [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Combination Debt and Equity Fund [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 8,275 | 7,251 |
|
Combination Debt and Equity Fund [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Real Estate Securities [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 7,449 | 7,095 |
|
Real Estate Securities [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Real Estate Securities [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
|
Real Estate Securities [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 7,449 | 7,095 |
|
Cash Equivalents [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 49 | 51 |
| Total Trading Securities, Assets | 169 | |
|
Cash Equivalents [Member] | Level 1 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 49 | 51 |
| Total Trading Securities, Assets | 169 | |
|
Cash Equivalents [Member] | Level 2 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | 0 | |
|
Cash Equivalents [Member] | Level 3 [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Total Nuclear Decommissioning Trust | 0 | 0 |
| Total Trading Securities, Assets | $ 0 |
| X | ||||||||||
|
- Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to 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 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
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to 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
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Reconciliations Of Assets And Liabilities At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Balance at period start | $ 16,714 | $ 18,113 | $ 20,478 | $ 18,036 | ||||||||
| Earnings | 686 | [1] | (68) | [1] | 2,172 | [1] | (266) | [1] | ||||
| Regulatory assets | 751 | (373) | (690) | (391) | ||||||||
| Regulatory liabilities | 3,225 | 50 | 1,496 | 682 | ||||||||
| Purchases | (1,536) | (117) | (2,768) | (688) | ||||||||
| Sales | (421) | (1,014) | (1,020) | (438) | ||||||||
| Settlements | (292) | 709 | (541) | 365 | ||||||||
| Balance at period end | 19,127 | 17,300 | 19,127 | 17,300 | ||||||||
|
Energy Marketing Contracts, Net [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Balance at period start | 5,343 | 12,006 | 9,452 | 11,815 | ||||||||
| Earnings | 686 | [1] | (68) | [1] | 2,172 | [1] | (266) | [1] | ||||
| Regulatory assets | 751 | [2] | (373) | [2] | (690) | [2] | (391) | [2] | ||||
| Regulatory liabilities | 2,943 | [2] | (65) | [2] | 949 | [2] | 535 | [2] | ||||
| Purchases | (2,187) | (329) | (3,559) | (1,072) | ||||||||
| Sales | (346) | (987) | (885) | (93) | ||||||||
| Settlements | (292) | 709 | (541) | 365 | ||||||||
| Balance at period end | 6,898 | 10,893 | 6,898 | 10,893 | ||||||||
|
Domestic Equity [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Balance at period start | 4,100 | 3,058 | 3,931 | 2,867 | ||||||||
| Earnings | 0 | [2] | 0 | [2] | 0 | [1] | 0 | [1] | ||||
| Regulatory assets | 0 | 0 | 0 | 0 | ||||||||
| Regulatory liabilities | 104 | (133) | 193 | (101) | ||||||||
| Purchases | 589 | 189 | 669 | 361 | ||||||||
| Sales | (13) | (3) | (13) | (16) | ||||||||
| Settlements | 0 | 0 | 0 | 0 | ||||||||
| Balance at period end | 4,780 | 3,111 | 4,780 | 3,111 | ||||||||
|
High-Yield Bonds [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Balance at period start | 0 | 305 | ||||||||||
| Earnings | 0 | [1] | 0 | [1] | ||||||||
| Regulatory assets | 0 | 0 | ||||||||||
| Regulatory liabilities | 0 | 0 | ||||||||||
| Purchases | 0 | 0 | ||||||||||
| Sales | 0 | (305) | ||||||||||
| Settlements | 0 | 0 | ||||||||||
| Balance at period end | 0 | 0 | ||||||||||
|
Real Estate Securities [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Balance at period start | 7,271 | 3,049 | 7,095 | 3,049 | ||||||||
| Earnings | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | ||||
| Regulatory assets | 0 | 0 | 0 | 0 | ||||||||
| Regulatory liabilities | 178 | 248 | 354 | 248 | ||||||||
| Purchases | 62 | 23 | 122 | 23 | ||||||||
| Sales | (62) | (24) | (122) | (24) | ||||||||
| Settlements | 0 | 0 | 0 | 0 | ||||||||
| Balance at period end | $ 7,449 | $ 3,296 | $ 7,449 | $ 3,296 | ||||||||
|
||||||||||||
| X | ||||||||||
|
- Definition
Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. 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 assets on the statement of financial position. No definition available.
|
| 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, Trading Securities, Energy Marketing And Risk Management (Unrealized Gains And Losses On Financial Statements) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Earnings | $ (320) | [1] | $ (33) | [1] | $ (124) | [1] | $ (305) | [1] | ||||
| Regulatory assets | 769 | (252) | (644) | (261) | ||||||||
| Regulatory liabilities | 2,020 | 0 | 227 | 619 | ||||||||
| Total | 2,469 | (285) | (541) | 53 | ||||||||
|
Energy Marketing Contracts, Net [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Earnings | (320) | [1] | (33) | [1] | (124) | [1] | (305) | [1] | ||||
| Regulatory assets | 769 | [2] | (252) | [2] | (644) | [2] | (261) | [2] | ||||
| Regulatory liabilities | 1,813 | [2] | (89) | [2] | (185) | [2] | 511 | [2] | ||||
| Total | 2,262 | (374) | (953) | (55) | ||||||||
|
Domestic Equity [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Earnings | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | ||||
| Regulatory assets | 0 | 0 | 0 | 0 | ||||||||
| Regulatory liabilities | 91 | (136) | 180 | (117) | ||||||||
| Total | 91 | (136) | 180 | (117) | ||||||||
|
Real Estate Securities [Member]
|
||||||||||||
| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||||
| Earnings | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | ||||
| Regulatory assets | 0 | 0 | 0 | 0 | ||||||||
| Regulatory liabilities | 116 | 225 | 232 | 225 | ||||||||
| Total | $ 116 | $ 225 | $ 232 | $ 225 | ||||||||
|
||||||||||||
| 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 assets on the statement of financial position. No definition available.
|
| 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.
|
| 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). No definition available.
|
| 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 earnings or resulted in a change in net asset value. No definition available.
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management Financial And Derivative Insturments, Trading Securities, Energy Marketing And Risk Management (Fair Value Inputs Quantitative Information) (Details) (USD $)
|
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | $ 11,428,000 | $ 15,731,000 |
|
Energy Marketing Contracts [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | 11,428,000 | 15,731,000 |
| Energy Marketing Contracts, Liabilities | 4,414,000 | 6,353,000 |
|
Level 3 [Member] | Energy Marketing Contracts [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | 10,645,000 | 13,330,000 |
| Energy Marketing Contracts, Liabilities | 3,747,000 | 3,878,000 |
|
Level 3 [Member] | Forward Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | 1,547,000 | |
| Energy Marketing Contracts, Liabilities | 1,377,000 | |
|
Level 3 [Member] | Forward Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | 257,000 | |
| Energy Marketing Contracts, Liabilities | 1,408,000 | |
|
Level 3 [Member] | Options Held [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| Energy Marketing Contracts, Assets | 8,841,000 | |
| Energy Marketing Contracts, Liabilities | 962,000 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Minimum [Member] | Forward Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 0 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Minimum [Member] | Forward Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 0 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Minimum [Member] | Option Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 0 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Minimum [Member] | Option Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 0 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Maximum [Member] | Forward Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 40 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Maximum [Member] | Forward Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 0 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Maximum [Member] | Option Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | 5 | |
|
Fair Value Inputs, Discounted Cash Flow [Member] | Maximum [Member] | Option Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsBasis | $ 0 | |
|
Fair Value Inputs, Option Models [Member] | Minimum [Member] | Option Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsVolatility | 10.00% | |
|
Fair Value Inputs, Option Models [Member] | Minimum [Member] | Option Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsVolatility | 15.00% | |
|
Fair Value Inputs, Option Models [Member] | Minimum [Member] | Options Held [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsCorrelation | 35.00% | |
|
Fair Value Inputs, Option Models [Member] | Maximum [Member] | Option Contracts Electricity [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsVolatility | 120.00% | |
|
Fair Value Inputs, Option Models [Member] | Maximum [Member] | Option Contracts Gas [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsVolatility | 55.00% | |
|
Fair Value Inputs, Option Models [Member] | Maximum [Member] | Options Held [Member]
|
||
| Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
| FairValueInputsCorrelation | 85.00% |
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
FairValueInputsBasis No definition available.
|
| X | ||||||||||
|
- Definition
FairValueInputsCorrelation No definition available.
|
| X | ||||||||||
|
- Definition
FairValueInputsVolatility No definition available.
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Investments In Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
||||||
|---|---|---|---|---|---|---|---|---|
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | $ 140,741 | $ 130,270 | ||||||
| Total Trading Securities, Assets | 41,696 | 40,201 | ||||||
| Total Assets Measured at Fair Value | 193,865 | 186,202 | ||||||
|
Domestic Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 56,865 | 57,117 | ||||||
| Total Trading Securities, Assets | 21,520 | 21,175 | ||||||
|
International Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 26,416 | 22,307 | ||||||
| Total Trading Securities, Assets | 5,172 | 4,896 | ||||||
|
Core Bonds [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 27,449 | 20,171 | ||||||
| Total Trading Securities, Assets | 15,004 | 13,961 | ||||||
|
Real Estate Securities [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 7,449 | 7,095 | ||||||
|
Fair Value [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 12,229 | 11,026 | ||||||
| Total Trading Securities, Assets | 41,696 | 40,032 | ||||||
| Total Assets Measured at Fair Value | 53,925 | 51,058 | ||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 1,246 | 1,914 | ||||||
|
Fair Value [Member] | Domestic Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 4,780 | [1] | 3,931 | [1] | ||||
| Total Trading Securities, Assets | 21,520 | 21,175 | ||||||
|
Fair Value [Member] | International Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Trading Securities, Assets | 5,172 | 4,896 | ||||||
|
Fair Value [Member] | Core Bonds [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Trading Securities, Assets | 15,004 | 13,961 | ||||||
|
Fair Value [Member] | Real Estate Securities [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Total Nuclear Decommissioning Trust | 7,449 | [2] | 7,095 | [2] | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 1,246 | 1,914 | ||||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Domestic Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 1,246 | [1] | 1,914 | [1] | ||||
|
Decommissioning Trust Assets [Member] | Fair Value [Member] | Real Estate Securities [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | [2] | 0 | [2] | ||||
|
Trading Securities [Member] | Fair Value [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | ||||||
|
Trading Securities [Member] | Fair Value [Member] | Domestic Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | ||||||
|
Trading Securities [Member] | Fair Value [Member] | International Equity [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 | 0 | ||||||
|
Trading Securities [Member] | Fair Value [Member] | Core Bonds [Member]
|
||||||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||||||
| Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 | $ 0 | ||||||
|
||||||||
| X | ||||||||||
|
- Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to 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 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 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
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Fair Value Of Commodity Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Derivative instruments not designated as hedging instruments, energy marketing contracts, assets | $ 11,428 | $ 15,731 |
|
Energy Marketing Contracts [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Derivative instruments not designated as hedging instruments, energy marketing contracts, assets | 11,428 | 15,731 |
| Derivative instruments not designated as hedging instruments, energy marketing contracts, liabilities | 4,414 | 6,353 |
|
Current Assets [Member] | Energy Marketing Contracts [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Derivative instruments not designated as hedging instruments, energy marketing contracts, assets | 5,981 | 8,180 |
|
Other Assets [Member] | Energy Marketing Contracts [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Derivative instruments not designated as hedging instruments, energy marketing contracts, assets | 5,447 | 7,551 |
|
Current Liabilities [Member] | Energy Marketing Contracts [Member]
|
||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||
| Derivative instruments not designated as hedging instruments, energy marketing contracts, liabilities | $ 4,414 | $ 6,353 |
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Changes In The Fair Value Of Commodity Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
|
Revenues Increase [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Revenues increase (decrease), Net Gain Recognized | $ 2,954 | $ 956 | $ 5,022 | $ 0 |
|
Revenues Decrease [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Revenues increase (decrease), Net Loss Recognized | 0 | 0 | 0 | (599) |
|
Regulatory Assets Increase [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Regulatory assets increase (decrease), Net Loss Recognized | 0 | 202 | ||
|
Regulatory Assets Decrease [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Regulatory assets increase (decrease), Net Gain Recognized | (627) | 0 | ||
|
Regulatory Liabilities Increase [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Regulatory liabilities (decrease) increase, Net Gain Recognized | 1,201 | 0 | 0 | 0 |
|
Regulatory Liabilities Decrease [Member]
|
||||
| Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management [Line Items] | ||||
| Regulatory liabilities (decrease) increase, Net Loss Recognized | $ 0 | $ (994) | $ (2,311) | $ (1,207) |
| X | ||||||||||
|
- Definition
Gain included in earnings for the period from the change in fair value of derivative instruments not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Loss included in earnings for the period from the change in fair value of derivative instruments not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of gain recognized in regulatory assets during the period on derivative instruments not designated as hedging instruments. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of gain recognized in regulatory liabilities during the period on derivative instruments not designated as hedging instruments. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of loss recognized in regulatory assets during the period on derivative instruments not designated as hedging instruments. No definition available.
|
| X | ||||||||||
|
- Definition
The amount of loss recognized in regulatory liabilities during the period on derivative instruments not designated as hedging instruments. No definition available.
|
| X | ||||||||||
|
- Details
|
|
Financial And Derivative Instruments, Trading Securities, Energy Marketing And Risk Management (Energy Related Products Contracts) (Details)
|
Jun. 30, 2012
MW
|
Dec. 31, 2011
MW
|
|---|---|---|
|
Derivative Electricity Contracts [Member]
|
||
| Debt Instrument [Line Items] | ||
| Derivative, Nonmonetary Notional Amount | 1,864,864 | 1,834,253 |
|
Derivative Natural Gas Contracts [Member]
|
||
| Debt Instrument [Line Items] | ||
| Derivative, Nonmonetary Notional Amount | 2,480,000 | 1,467,500 |
| X | ||||||||||
|
- Definition
Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
|
Financial Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Schedule of Available-for-sale Securities [Line Items] | ||||
| Unrealized gains (losses) | $ (1.8) | $ 0.6 | $ 1.8 | $ 2.5 |
| Fair value of the debt securities in the NDT fund | 41.7 | 41.7 | ||
| Realized gains (losses) on available-for-sale-securities | $ 0.4 | $ 0.3 | $ 0.6 | $ 1.3 |
| 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
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Financial Investments (Costs And Fair Values Of Investments) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | $ 136,429 | $ 133,213 |
| Gross Unrealized Gain | 8,030 | 2,168 |
| Gross Unrealized Loss | (3,718) | (5,111) |
| Fair Value | 140,741 | 130,270 |
| Available-for-sale Securities, Security Type Allocation Percentage | 100.00% | 100.00% |
|
Domestic Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 50,920 | 55,357 |
| Gross Unrealized Gain | 5,945 | 1,760 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | 56,865 | 57,117 |
| Available-for-sale Securities, Security Type Allocation Percentage | 40.00% | 44.00% |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 27,799 | 24,501 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | (1,383) | (2,194) |
| Fair Value | 26,416 | 22,307 |
| Available-for-sale Securities, Security Type Allocation Percentage | 19.00% | 17.00% |
|
Core Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 26,554 | 19,771 |
| Gross Unrealized Gain | 895 | 400 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | 27,449 | 20,171 |
| Available-for-sale Securities, Security Type Allocation Percentage | 20.00% | 16.00% |
|
High-Yield Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 7,762 | 11,046 |
| Gross Unrealized Gain | 389 | 0 |
| Gross Unrealized Loss | 0 | (77) |
| Fair Value | 8,151 | 10,969 |
| Available-for-sale Securities, Security Type Allocation Percentage | 6.00% | 8.00% |
|
Emerging Market Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 5,725 | 5,301 |
| Gross Unrealized Gain | 362 | 8 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | 6,087 | 5,309 |
| Available-for-sale Securities, Security Type Allocation Percentage | 4.00% | 4.00% |
|
Combination Debt and Equity Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 7,836 | 7,524 |
| Gross Unrealized Gain | 439 | 0 |
| Gross Unrealized Loss | 0 | (273) |
| Fair Value | 8,275 | 7,251 |
| Available-for-sale Securities, Security Type Allocation Percentage | 6.00% | 6.00% |
|
Real Estate Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 9,784 | 9,662 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | (2,335) | (2,567) |
| Fair Value | 7,449 | 7,095 |
| Available-for-sale Securities, Security Type Allocation Percentage | 5.00% | 5.00% |
|
Cash Equivalents [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 49 | 51 |
| Gross Unrealized Gain | 0 | 0 |
| Gross Unrealized Loss | 0 | 0 |
| Fair Value | $ 49 | $ 51 |
| 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
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. No definition available.
|
| 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 |
Jun. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | $ 26,416 | $ 40,527 |
| Gross Unrealized Losses, Less than 12 Months | (1,383) | (2,544) |
| Fair Value, 12 Months or Greater | 7,449 | 7,095 |
| Gross Unrealized Losses, 12 Months or Greater | (2,335) | (2,567) |
| Fair Value, Total | 33,865 | 47,622 |
| Gross Unrealized Losses, Total | (3,718) | (5,111) |
|
International Equity [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 26,416 | 22,307 |
| Gross Unrealized Losses, Less than 12 Months | (1,383) | (2,194) |
| Fair Value, 12 Months or Greater | 0 | 0 |
| Gross Unrealized Losses, 12 Months or Greater | 0 | 0 |
| Fair Value, Total | 26,416 | 22,307 |
| Gross Unrealized Losses, Total | (1,383) | (2,194) |
|
High-Yield Bonds [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 10,969 | |
| Gross Unrealized Losses, Less than 12 Months | (77) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 10,969 | |
| Gross Unrealized Losses, Total | (77) | |
|
Combination Debt and Equity Fund [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Fair Value, Less than 12 Months | 7,251 | |
| Gross Unrealized Losses, Less than 12 Months | (273) | |
| Fair Value, 12 Months or Greater | 0 | |
| Gross Unrealized Losses, 12 Months or Greater | 0 | |
| Fair Value, Total | 7,251 | |
| Gross Unrealized Losses, Total | (273) | |
|
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 | 7,449 | 7,095 |
| Gross Unrealized Losses, 12 Months or Greater | (2,335) | (2,567) |
| Fair Value, Total | 7,449 | 7,095 |
| Gross Unrealized Losses, Total | $ (2,335) | $ (2,567) |
| X | ||||||||||
|
- Definition
Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. No definition available.
|
| X | ||||||||||
|
- Definition
Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities. 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 the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for securities categorized neither as held-to-maturity nor trading securities. 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
|
|
Rate Matters And Regulation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | |||
|---|---|---|---|---|
|
Oct. 15, 2011
|
May 29, 2012
|
Apr. 18, 2012
|
Apr. 06, 2012
|
|
| Regulatory Proceedings [Line Items] | ||||
| Estimated Increase In Annual Retail Revenues For Environmental Costs | $ 19.5 | |||
| Expected Increase In Annual Retail Revenues | 50.0 | |||
| ChangeinDepreciationEstimate | 43.6 | |||
| ChangeInRemovalCostEstimate | 57.9 | |||
| Estimated Increase In Annual Retail Revenues For Transmission Costs | 36.7 | |||
| Expected Increase In Annual Transmission Revenues | $ 38.2 |
| X | ||||||||||
|
- Definition
ChangeinDepreciationEstimate No definition available.
|
| X | ||||||||||
|
- Definition
ChangeInRemovalCostEstimate No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Environmental Costs No definition available.
|
| X | ||||||||||
|
- Definition
Estimated Increase In Annual Retail Revenues For Transmission Costs No definition available.
|
| X | ||||||||||
|
- Definition
The estimated increase in a public utility's annual transmission revenues as a result of rate proceedings. No definition available.
|
| X | ||||||||||
|
- Definition
Expected Increase In Annual Retail Revenues No definition available.
|
| X | ||||||||||
|
- Details
|
|
Long-term Debt (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | 0 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
May 15, 2012
Westar Energy [Member]
|
Mar. 30, 2012
Westar Energy [Member]
|
May 17, 2012
Westar Energy [Member]
Secured Debt [Member]
|
May 17, 2012
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument Two [Member]
|
Mar. 01, 2012
Westar Energy [Member]
Secured Debt [Member]
Debt Intrument One [Member]
|
Mar. 30, 2012
KGE [Member]
|
|
| Debt Instrument [Line Items] | ||||||||
| Long-term Debt, Gross | $ 300,000 | $ 250,000 | ||||||
| Debt Instrument, Interest Rate, Effective Percentage | 4.157% | 4.13% | ||||||
| Debt Instrument, Interest Rate, Stated Percentage | 6.10% | 5.00% | 0.00% | 4.125% | 5.10% | |||
| Proceeds from Issuance of Long-term Debt | 541,504 | 0 | 541,500 | |||||
| Repayments of Long-term Debt | $ 220,563 | $ 191 | $ 150,000 | $ 57,200 | $ 13,300 | |||
| X | ||||||||||
|
- Definition
Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| 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 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 | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Dec. 31, 2011
|
|
| Income Tax Contingency [Line Items] | |||||
| Income tax expense | $ 28,340,000 | $ 19,599,000 | $ 40,783,000 | $ 33,112,000 | |
| Effective Income Tax Rate, Continuing Operations | 31.00% | 30.00% | 30.00% | 30.00% | |
| Unrecognized Tax Benefits | 2,300,000 | 2,300,000 | 2,500,000 | ||
| Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 300,000 | 300,000 | 200,000 | ||
| Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 | 0 | 0 | ||
| Probable Assessments of 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
A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
|
Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2012
MW
Y
sites
States
Criteria_Pollutants
|
Dec. 31, 2011
|
|
| Federal Clean Air Act [Abstract] | ||
| Number of National Ambient Air Quality Standards | 6 | |
| Review period interval by the EPA | 5 | |
| Environmental Projects [Abstract] | ||
| Environmental upgrades of jointly owned utility plant entity share | $ 600.0 | |
| Air Emissions [Abstract] | ||
| Estimated Cost to Comply with Environmental Regulation | 40.0 | |
| Number of states required to comply with regulations | 28 | |
| Number of states required to comply with seasonal regulations | 5 | |
| Renewable Energy Standard [Abstract] | ||
| Capacity Of Qualifying Wind Generation Facilities | 300 | |
| Supply agreement duration, years | 20 | |
| Future Capacity Of Wind Generation Facilities | 370 | |
| Manufactured Gas Sites [Abstract] | ||
| Number Of Former Manufactured Gas Sites With No Remediation Liability For Entity | 7 | |
| Number Of Former Manufactured Gas Sites Shared For Remediation Liability | 5 | |
| Maximum Environmental Remediation Liability For Former Kansas Manufactured Gas Sites | 3.8 | |
| EPA Consent Decree [Abstract] | ||
| Preliminary estimate of the cost of selective catalytic reduction (SCR) | 240.0 | |
| FERC Investigation [Abstract] | ||
| Loss Contingency, Estimate of Possible Loss | 0.5 | 0.5 |
|
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 | |
|
Preliminary Unjust Profits [Member]
|
||
| FERC Investigation [Abstract] | ||
| Unjust profits and failed SPP payments through alleged activities | 14.3 | |
|
Revised Unjust Profits [Member]
|
||
| FERC Investigation [Abstract] | ||
| Unjust profits and failed SPP payments through alleged activities | 3.0 | |
|
Alleged Transmission Service Costs [Member]
|
||
| FERC Investigation [Abstract] | ||
| Unjust profits and failed SPP payments through alleged activities | 3.2 | |
|
Further Revised Unjust Profits [Member]
|
||
| FERC Investigation [Abstract] | ||
| Unjust profits and failed SPP payments through alleged activities | 0.9 | |
|
Revised Alleged Transmission Service Costs [Member]
|
||
| FERC Investigation [Abstract] | ||
| Unjust profits and failed SPP payments through alleged activities | $ 0.8 | |
|
Maximum [Member]
|
||
| Air Emissions [Abstract] | ||
| Period to Submit Implementation Plan | 12 |
| X | ||||||||||
|
- Definition
The value (monetary amount) of the award the plaintiff seeks in the legal matter. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Capacity Of Future Wind Generation Facilities No definition available.
|
| X | ||||||||||
|
- Definition
Capacity Of Qualifying Wind Generation Facilities No definition available.
|
| X | ||||||||||
|
- Details
|
| 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 | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
GHG Emission No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Maximum Environmental Remediation Liability For Former Kansas Manufactured Gas Sites No definition available.
|
| X | ||||||||||
|
- Definition
Number Of Former Manufactured Gas Sites Shared For Remediation Liability No definition available.
|
| X | ||||||||||
|
- Definition
Number Of Former Manufactured Gas Sites With No Remediation Liability For Entity No definition available.
|
| X | ||||||||||
|
- Definition
Number of Pollutants Covered Under National Ambient Air Quality Standards No definition available.
|
| X | ||||||||||
|
- Definition
Number of States Required to Comply with Regulations No definition available.
|
| X | ||||||||||
|
- Definition
Number of States Required to Comply with Seasonal Regulations No definition available.
|
| X | ||||||||||
|
- Definition
Period to Submit Implementation Plan No definition available.
|
| X | ||||||||||
|
- Definition
Entity's share of the total amount of proposed environmental upgrades at a jointly owned utility plant. No definition available.
|
| X | ||||||||||
|
- Definition
Renewable Energy Generation Capacity No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Review Period Interval by the EPA No definition available.
|
| X | ||||||||||
|
- Definition
Supply Agreement Duration No definition available.
|
|
Employee Benefit Plans (Net Periodic Costs And Pension Contributions) (Details) (USD $)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | $ 49,400,000 | $ 41,100,000 | ||
|
Pension Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 4,889,000 | 4,021,000 | 9,777,000 | 8,038,000 |
| Interest cost | 9,894,000 | 9,960,000 | 19,789,000 | 19,915,000 |
| Expected return on plan assets | (8,070,000) | (7,772,000) | (16,142,000) | (15,544,000) |
| Transition obligation, net | 0 | 0 | 0 | 0 |
| Prior service costs | 153,000 | 303,000 | 307,000 | 606,000 |
| Actuarial loss/(gain), net | 8,194,000 | 5,915,000 | 16,389,000 | 11,830,000 |
| Net periodic cost before regulatory adjustment | 15,060,000 | 12,427,000 | 30,120,000 | 24,845,000 |
| Regulatory adjustment | (2,005,000) | (5,641,000) | (9,250,000) | (11,267,000) |
| Net periodic cost | 13,055,000 | 6,786,000 | 20,870,000 | 13,578,000 |
|
Post-Retirement Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 514,000 | 450,000 | 1,029,000 | 902,000 |
| Interest cost | 1,574,000 | 1,704,000 | 3,149,000 | 3,397,000 |
| Expected return on plan assets | (1,372,000) | (1,300,000) | (2,746,000) | (2,501,000) |
| Transition obligation, net | 978,000 | 978,000 | 1,956,000 | 1,956,000 |
| Prior service costs | 631,000 | 723,000 | 1,262,000 | 1,262,000 |
| Actuarial loss/(gain), net | 376,000 | 97,000 | 752,000 | 351,000 |
| Net periodic cost before regulatory adjustment | 2,701,000 | 2,652,000 | 5,402,000 | 5,367,000 |
| Regulatory adjustment | (278,000) | 329,000 | 40,000 | 626,000 |
| Net periodic cost | $ 2,423,000 | $ 2,981,000 | $ 5,442,000 | $ 5,993,000 |
| 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 Employee Benefit Plans (Net Periodic Costs and Pension Contributions) (Details) (USD $)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | $ 49,400,000 | $ 41,100,000 | ||
|
Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Pension Contributions | 9,000,000 | 7,100,000 | ||
|
KGE [Member]
|
||||
| Subsidiary Interest in Defined Benefit Plans | 47.00% | |||
|
Pension Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 4,889,000 | 4,021,000 | 9,777,000 | 8,038,000 |
| Interest cost | 9,894,000 | 9,960,000 | 19,789,000 | 19,915,000 |
| Expected return on plan assets | (8,070,000) | (7,772,000) | (16,142,000) | (15,544,000) |
| Transition obligation, net | 0 | 0 | 0 | 0 |
| Prior service costs | 153,000 | 303,000 | 307,000 | 606,000 |
| Actuarial loss, net | 8,194,000 | 5,915,000 | 16,389,000 | 11,830,000 |
| Net periodic cost before regulatory adjustment | 15,060,000 | 12,427,000 | 30,120,000 | 24,845,000 |
| Regulatory adjustment | (2,005,000) | (5,641,000) | (9,250,000) | (11,267,000) |
| Net periodic cost | 13,055,000 | 6,786,000 | 20,870,000 | 13,578,000 |
|
Pension Benefits [Member] | Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 1,516,000 | 1,219,000 | 3,031,000 | 2,479,000 |
| Interest cost | 1,884,000 | 1,821,000 | 3,769,000 | 3,685,000 |
| Expected return on plan assets | (1,644,000) | (1,428,000) | (3,289,000) | (2,953,000) |
| Transition obligation, net | 0 | 13,000 | 0 | 26,000 |
| Prior service costs | 1,000 | 4,000 | 3,000 | 8,000 |
| Actuarial loss, net | 1,341,000 | 798,000 | 2,683,000 | 1,793,000 |
| Net periodic cost before regulatory adjustment | 3,098,000 | 2,427,000 | 6,197,000 | 5,038,000 |
| Regulatory adjustment | (484,000) | (663,000) | (1,514,000) | (1,320,000) |
| Net periodic cost | 2,614,000 | 1,764,000 | 4,683,000 | 3,718,000 |
|
Post-Retirement Benefits [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 514,000 | 450,000 | 1,029,000 | 902,000 |
| Interest cost | 1,574,000 | 1,704,000 | 3,149,000 | 3,397,000 |
| Expected return on plan assets | (1,372,000) | (1,300,000) | (2,746,000) | (2,501,000) |
| Transition obligation, net | 978,000 | 978,000 | 1,956,000 | 1,956,000 |
| Prior service costs | 631,000 | 723,000 | 1,262,000 | 1,262,000 |
| Actuarial loss, net | 376,000 | 97,000 | 752,000 | 351,000 |
| Net periodic cost before regulatory adjustment | 2,701,000 | 2,652,000 | 5,402,000 | 5,367,000 |
| Regulatory adjustment | (278,000) | 329,000 | 40,000 | 626,000 |
| Net periodic cost | 2,423,000 | 2,981,000 | 5,442,000 | 5,993,000 |
|
Post-Retirement Benefits [Member] | Wolf Creek [Member]
|
||||
| Components of Net Periodic Cost (Benefit): | ||||
| Service cost | 48,000 | 29,000 | 96,000 | 83,000 |
| Interest cost | 103,000 | 104,000 | 205,000 | 229,000 |
| Expected return on plan assets | 0 | 0 | 0 | 0 |
| Transition obligation, net | 14,000 | 14,000 | 29,000 | 29,000 |
| Prior service costs | 0 | (8,000) | 0 | 0 |
| Actuarial loss, net | 58,000 | 38,000 | 117,000 | 114,000 |
| Net periodic cost before regulatory adjustment | 223,000 | 177,000 | 447,000 | 455,000 |
| Regulatory adjustment | 0 | 0 | 0 | 0 |
| Net periodic cost | $ 223,000 | $ 177,000 | $ 447,000 | $ 455,000 |
| 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
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| 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
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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
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| X | ||||||||||
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- 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.
|
|
Common and Preferred Stock Common and Preferred Stock (Details) (USD $)
|
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2012
months
|
Dec. 31, 2011
|
|
| Forward Contract Indexed to Issuer's Equity, Indexed Shares | 1,100,000 | |
| Forward Contract Indexed to Issuer's Equity, Settlement Period | 18 | |
| Forward Contract Indexed to Issuer's Equity, Estimated Proceeds | $ 29,300,000 | |
| Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share | $ 27.46 | |
| Preferred Stock, shares outstanding | 0 | 214,363 |
|
Redeemable Preferred Stock Rate One [Member]
|
||
| Preferred Stock, Dividend Rate, Percentage | 4.50% | |
| Preferred Stock, shares outstanding | 121,613 | |
| Preferred Stock, Value, Outstanding | 12,161,000 | |
| Preferred Stock, Call or Exercise Features | 1.08 | |
| Redemption Premium | 973,000 | |
| Preferred Stock, Redemption Amount | 13,134,000 | |
|
Redeemable Preferred Stock Rate Two [Member]
|
||
| Preferred Stock, Dividend Rate, Percentage | 4.25% | |
| Preferred Stock, shares outstanding | 54,970 | |
| Preferred Stock, Value, Outstanding | 5,497,000 | |
| Preferred Stock, Call or Exercise Features | 1.015 | |
| Redemption Premium | 82,000 | |
| Preferred Stock, Redemption Amount | 5,579,000 | |
|
Redeemable Preferred Stock Rate Three [Member]
|
||
| Preferred Stock, Dividend Rate, Percentage | 5.00% | |
| Preferred Stock, shares outstanding | 37,780 | |
| Preferred Stock, Value, Outstanding | 3,778,000 | |
| Preferred Stock, Call or Exercise Features | 1.02 | |
| Redemption Premium | 76,000 | |
| Preferred Stock, Redemption Amount | 3,854,000 | |
|
Repurchase of Equity [Member]
|
||
| Preferred Stock, shares outstanding | 214,363 | |
| Preferred Stock, Value, Outstanding | 21,436,000 | |
| Redemption Premium | 1,131,000 | |
| Preferred Stock, Redemption Amount | $ 22,567,000 |
| X | ||||||||||
|
- Definition
The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
Describe call and/or exercise rights, prices and dates of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The percentage rate used to calculate dividend payments on preferred stock. No definition available.
|
| X | ||||||||||
|
- Definition
The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Estimated Proceeds No definition available.
|
| X | ||||||||||
|
- Definition
Forward Contract Indexed to Issuer's Equity, Settlement Period No definition available.
|
|
Variable Interest Entities (Narrative) (Details)
|
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
|
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 |
|
Railroad Transportation Equipment 2 [Member]
|
|
| Variable Interest Entity [Line Items] | |
| Agreement expiration date | Nov. 01, 2014 |
| X | ||||||||||
|
- Definition
Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The percentage of an asset held by a variable interest entity that is consolidated by the entity. No definition available.
|
|
Variable Interest Entities (Assets And Liabilities In Relation To VIEs) (Details) (USD $)
In Thousands, unless otherwise specified |
Jun. 30, 2012
|
Dec. 31, 2011
|
||||||
|---|---|---|---|---|---|---|---|---|
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | $ 6,724,590 | $ 6,411,922 | ||||||
| Accrued interest | 50,440 | [1] | 77,437 | [1] | ||||
| Long-term debt of variable interest entities, net | 2,818,966 | 2,491,109 | ||||||
|
Variable Interest Entity, Primary Beneficiary [Member]
|
||||||||
| Variable Interest Entity [Line Items] | ||||||||
| Property, plant and equipment, net | 327,734 | 333,494 | ||||||
| Regulatory assets | 5,400 | [2] | 4,915 | [2] | ||||
| Current maturities of long-term debt | 45,853 | 28,114 | ||||||
| Accrued interest | 4,227 | [1] | 4,448 | [1] | ||||
| Long-term debt of variable interest entities, net | $ 223,506 | $ 249,283 | ||||||
|
||||||||
| 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
Carrying amount of long-term debt, net of 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, net of accumulated depreciation, depletion and amortization, 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. 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
|