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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Income Taxes [Abstract] |  |
Depreciation and depletion | $ 336,471 | $ 396,355
Original Issue Discount on 2025 and 2032 Notes | 13,098 | 37,067
Equity investments in production facilities | 81,082 | 76,911
Prepaid and other | 10,548 | 14,779
Total deferred tax liabilities | 441,199 | 525,112
Net operating loss carryforward | (36,981) | (34,987)
Asset retirement obligations | (70,085) | (88,279)
Reserves, accrued liabilities and other | (35,229) | (39,995)
Deferred Tax Assets, Gross | (142,295) | (163,261)
Valuation allowance | 16,391 | 14,310
Current deferred tax assets | (43,942) | (41,449)
Deferred tax liabilities | 359,237 | 417,610
Net deferred tax liabilities | $ 315,295 | $ 376,161

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