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Impairment - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
Impairment - Additional Information (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Jun. 30, 2013
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges		$ 26,280,000us-gaap_AssetImpairmentCharges	$ 316,004,000us-gaap_AssetImpairmentCharges	$ 2,825,000us-gaap_AssetImpairmentCharges
Goodwill impairment loss	235,400,000us-gaap_GoodwillImpairmentLoss		235,400,000us-gaap_GoodwillImpairmentLoss
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
Gas Treating Plants and other Midstream Assets
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges		12,200,000			10,000,000	2,100,000
Rigs
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges			0
Drilling Assets
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges		11,100,000				10,600,000
Assets held-for-sale		5,900,000			5,900,000	6,200,000
Corporate Asset
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges						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