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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

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Impairment - Narrative (Details) (USD $)	12 Months Ended			3 Months Ended
Impairment - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2013
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [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
Goodwill impairment loss			235,400,000us-gaap_GoodwillImpairmentLoss
Drilling and Oilfield Services Assets - Permian Region
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges	24,300,000
Drilling Assets
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges	3,100,000	11,100,000		10,600,000
Drilling Rigs
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges			0
Gas Treating Plants and other Midstream Assets
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges	600,000	12,200,000		2,100,000	10,000,000
Gas Treating Plants and CO2 Compression Facilities
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges			79,300,000
Corporate Asset
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges		2,900,000		2,900,000
Software Costs
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges			1,300,000
Gulf Properties
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Full cost ceiling impairments	$ 164,800,000