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Business Segment Information - Summarized Financial Information Concerning Segments (Parenthetical) (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
Segment Reporting Information [Line Items]
Unrealized gain (loss) on derivatives									$ 217,755	$ 101,034	$ (283,604)
Goodwill impairment loss	235,396	0
(Gain) loss on derivative contracts									(241,419)	(44,075)	50,872
Asset impairment charges									316,004	2,825	0
Exploration and Production
Segment Reporting Information [Line Items]
Goodwill impairment loss	235,396
Commodity Derivatives
Segment Reporting Information [Line Items]
Unrealized gain (loss) on derivatives	(19,300)	(222,500)	580,700	(129,200)	(429,100)	604,600	188,300	(269,000)	209,701	94,788	(275,209)
Commodity Derivatives | Exploration and Production
Segment Reporting Information [Line Items]
Unrealized gain (loss) on derivatives									209,701	94,788	(275,209)
Gas Treating Plants | Midstream Services
Segment Reporting Information [Line Items]
Asset impairment charges									59,700
CO2 Compression Facilities | All Other
Segment Reporting Information [Line Items]
Asset impairment charges									$ 19,600

X

- Definition

Aggregate net gain(loss) on commodity derivative instruments recognized in earnings during the period, before tax effects.

+ References

No definition available.

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The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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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.

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