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Property, Plant and Equipment (Details) a in Thousands, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) a	Feb. 28, 2017 USD ($)	Jun. 30, 2018 USD ($) a	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) a	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Total Property, Plant and Equipment	$ 8,941,426		$ 8,941,426		$ 8,941,426		$ 9,316,495
Less: Accumulated Depreciation, Depletion and Amortization	2,399,555		2,399,555		2,399,555		3,526,742
Total Property, Plant and Equipment Assets Held for Sale - Net	230,593		230,593		230,593		0
Total Property, Plant and Equipment—Net	$ 6,772,464		6,772,464		6,772,464		5,789,753
Impairment on Knox			$ 0	$ 0	$ 0	$ 137,865
Undeveloped acres | a	26		26		26
Proceeds from sale of joint venture	$ 400,000
Deposit received for sale of joint venture			$ 40,000
Gas Segment [Member]
Property, Plant and Equipment [Line Items]
Intangible drilling cost	3,772,658		3,772,658		$ 3,772,658		3,849,689
Proved gas properties	937,243		937,243		937,243		1,999,891
Gas gathering equipment	2,017,836		2,017,836		2,017,836		1,182,234
Unproved gas properties	1,093,985		1,093,985		1,093,985		919,733
Gas wells and related equipment	743,752		743,752		743,752		834,120
Surface land and other equipment	309,894		309,894		309,894		309,602
Other gas assets	66,058		66,058		66,058		221,226
Total Property, Plant and Equipment	8,941,426		8,941,426		8,941,426		9,316,495
Less: Accumulated Depreciation, Depletion and Amortization	2,399,555		2,399,555		2,399,555		3,526,742
Total Property, Plant and Equipment Assets Held for Sale - Net	230,593		230,593		230,593
Total Property, Plant and Equipment—Net	$ 6,772,464		$ 6,772,464		$ 6,772,464		$ 5,789,753
Knox and Coalfield [Member]
Property, Plant and Equipment [Line Items]
Impairment on Knox		$ 137,865
Joint Venture [Member]
Property, Plant and Equipment [Line Items]
Ownership percentage in equity method investment	50.00%		50.00%		50.00%
Drilling Carry, Working Interest Obligations					50.00%
Joint Venture [Member] | Utica Shale [Member]
Property, Plant and Equipment [Line Items]
Area of Land | a	125		125		125
Joint Venture [Member] | Hess [Member]
Property, Plant and Equipment [Line Items]
Drilling commitment carry	$ 335,000		$ 335,000		$ 335,000

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