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Derivatives - Cash Settlements and Valuation Gains and Losses on Derivative Contracts and Interest Rate Swaps (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative Instruments, (Gain) Loss
Unrealized (gain) loss									$ (217,755)		$ (101,034)		$ 283,604
Commodity Derivatives
Derivative Instruments, (Gain) Loss
Realized (gain) loss									(31,718)	[1]	50,713	[1]	(224,337)	[1]
Unrealized (gain) loss	19,300	222,500	(580,700)	129,200	429,100	(604,600)	(188,300)	269,000	(209,701)		(94,788)		275,209
(Gain) loss recognized in income									(241,419)		(44,075)		50,872
Interest rate swap
Derivative Instruments, (Gain) Loss
Realized (gain) loss									9,243	[1]	9,414	[1]	8,145	[1]
Unrealized (gain) loss									(8,054)		(6,246)		8,395
(Gain) loss recognized in income									$ 1,189		$ 3,168		$ 16,540
[1] The year ended December 31, 2012 includes $59.5 million of net realized gain related to settlements of commodity derivative contracts with contractual maturities after the quarterly period in which they were settled (“early settlements”) and a $117.1 million non-cash realized loss on derivative contracts amended in January 2012. The years ended December 31, 2011 and 2010 include $48.1 million ($111.0 million realized gain and $62.9 million realized loss) and $114.5 million of realized gain, respectively, related to early settlements.

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- Definition

Gains and losses realized upon settlement of derivative contract.

+ References

No definition available.

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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