| Label | Element | Value | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount | us-gaap_RedeemableNoncontrollingInterestEquityCommonCarryingAmount | $ 38,145,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Payments of Ordinary Dividends, Common Stock | us-gaap_PaymentsOfDividendsCommonStock | 95,312,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends, Common Stock | us-gaap_DividendsCommonStock | 95,312,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | 326,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reclassifications of Temporary to Permanent Equity | us-gaap_ReclassificationsOfTemporaryToPermanentEquity | (38,145,000) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Value, Other | us-gaap_StockIssuedDuringPeriodValueOther | 35,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Return of Capital | cik0000728391_ReturnOfCapital | (3,400,000) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Corporate Segment [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | us-gaap_Assets | 8,111,750,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | us-gaap_Assets | 7,748,106,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other Operating Segment [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | us-gaap_Assets | 16,697,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets | us-gaap_Assets | $ 9,071,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Obligations [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lease, Cost [Table Text Block] | us-gaap_LeaseCostTableTextBlock | The following table summarizes supplemental balance sheet information related to leases as of the periods indicated:
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| Common Stock [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity, Attributable to Parent | us-gaap_StockholdersEquity | $ 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Paid-in Capital [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Additional Paid in Capital | us-gaap_AdditionalPaidInCapital | 1,247,090,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Value, Other | us-gaap_StockIssuedDuringPeriodValueOther | 35,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Retained Earnings [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Retained Earnings (Accumulated Deficit) | us-gaap_RetainedEarningsAccumulatedDeficit | 2,067,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pike Co Bess First Sell Down [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sales to Noncontrolling Interests | cik0000728391_SalesToNoncontrollingInterests | 38,145,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pike Co Bess Project [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sales to Noncontrolling Interests | cik0000728391_SalesToNoncontrollingInterests | $ 150,191,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
- Definition Return of capital payments for the portion of distributions in excess of net income. No definition available.
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| X | ||||||||||
- Definition Sales to Noncontrolling Interests No definition available.
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| X | ||||||||||
- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| 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/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The difference between the carrying amount of a financial instrument subject to a registration payment arrangement recorded as temporary equity prior to adoption of FSP EITF 00-19-2 and the carrying amount reclassified to permanent equity upon the adoption of FSP EITF 00-19-2. Recorded as a cumulative effect adjustment to the beginning balance of retained earnings. Does not apply to registration payment arrangements that are no longer outstanding upon adoption of FSP EITF 00-19-2. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of accumulated undistributed earnings (deficit). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Value of shares of stock issued attributable to transactions classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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