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Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

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Quarterly Financial Results (Additional Information) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information [Line Items]
Full cost ceiling impairments									$ 164,800,000	$ 0	$ 0
Asset impairment charges									192,768,000us-gaap_AssetImpairmentCharges	26,280,000us-gaap_AssetImpairmentCharges	316,004,000us-gaap_AssetImpairmentCharges
(Gain) loss on derivative contracts									(334,011,000)	47,123,000	(241,419,000)
Permian Properties
Quarterly Financial Information [Line Items]
Gain (loss) on divestiture								(398,900,000)		(398,900,000)
Drilling Assets
Quarterly Financial Information [Line Items]
Asset impairment charges							10,600,000		3,100,000	11,100,000
Corporate Asset
Quarterly Financial Information [Line Items]
Asset impairment charges							2,900,000			2,900,000
Gas Treating Plants and other Midstream Assets
Quarterly Financial Information [Line Items]
Asset impairment charges					10,000,000		2,100,000		600,000	12,200,000
Commodity Derivatives
Quarterly Financial Information [Line Items]
(Gain) loss on derivative contracts	(329,200,000)	(132,600,000)	85,300,000	42,500,000	(22,900,000)	132,800,000	(103,700,000)	40,900,000	(334,000,000)	47,100,000	(241,400,000)
Exploration and Production
Quarterly Financial Information [Line Items]
Full cost ceiling impairments				164,800,000					164,800,000
Exploration and Production \| Permian Properties
Quarterly Financial Information [Line Items]
Gain (loss) on divestiture										(398,900,000)
Drilling and Oil Field Services
Quarterly Financial Information [Line Items]
Asset impairment charges	$ 24,300,000		$ 3,100,000						$ 27,400,000	$ 11,100,000