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Asset Retirement Obligations (Narrative) (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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| Asset Retirement Obligations [Line Items] | ||
| Reduction in asset retirement obligations | $ (59,958,000) | $ (87,166,000) |
| Reduction in asset retirement obligations including plug and abandon wells and facilities damaged by hurricane | 23,000,000 | 62,900,000 |
| Liabilities assumed through acquisition | 8,194,000 | 24,477,000 |
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Hurricane Ike[Member]
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| Asset Retirement Obligations [Line Items] | ||
| Revisions of estimated liabilities | 4,744,000 | 41,952,000 |
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NTL 2010-G05 [Member]
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| Asset Retirement Obligations [Line Items] | ||
| Revisions of estimated liabilities | 18,725,000 | |
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All Other [Member]
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| Asset Retirement Obligations [Line Items] | ||
| Revisions of estimated liabilities | $ 19,248,000 | $ 20,410,000 |
| X | ||||||||||
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- Definition
Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Asset Retirement Obligations, Liabilities Assumed Through Acquisition No definition available.
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- Details
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- Definition
Reduction In Asset Retirement Obligations Including Plug And Abandon Wells And Facilities Damaged By Hurricane No definition available.
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