Impairments (Details) - USD ($) $ in Thousands	3 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2015	Dec. 31, 2014
Impaired Long-Lived Assets Held and Used [Line Items]
Impairments		$ 0	$ 0	$ 1,397,424	$ 791,809
Impairment of Long-Lived Assets Held-for-use		0	0	1,396,340	791,809
Other Asset Impairment Charges		$ 0	$ 0	1,084	0
Eagle Ford Shale, Lavaca County [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use				1,400,000
East Texas, Granite Wash and Marcellus regions
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use					667,800
Mid-Continent region
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Oil and Gas Properties					6,100
Selma Chalk
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Oil and Gas Properties	$ 117,900				$ 117,900
Tubular Goods
Impaired Long-Lived Assets Held and Used [Line Items]
Other Asset Impairment Charges				1,100
Fair Value, Measurements, Nonrecurring
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment of Long-Lived Assets Held-for-use				$ 312,000