Impairment - Narrative (Details)	3 Months Ended							12 Months Ended
	Dec. 31, 2015 USD ($) property	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Full cost ceiling impairments							$ 164,800,000	$ 4,500,000,000	$ 164,800,000	$ 0
Asset impairment charges	$ 886,800,000	$ 1,100,000,000	$ 1,500,000,000	$ 1,100,000,000				4,534,689,000	192,768,000	26,280,000
Net value of assets held for sale	$ 491,760,000				$ 576,463,000			491,760,000	576,463,000
Number of properties held for sale | property	1
Drilling and Oil Field Services
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Net value of assets held for sale	$ 16,000,000		$ 20,000,000					16,000,000
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					$ 24,300,000	$ 3,100,000		37,600,000	3,100,000	11,100,000
Gas Treating Plants and other Midstream Assets
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges								7,100,000	$ 600,000	12,200,000
Buildings
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges								$ 15,400,000
Corporate Asset
Schedule of Impaired Long-Lived Assets Held and Used and Intangible Assets [Line Items]
Asset impairment charges										$ 2,900,000