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Property, Plant and Equipment (Details)
a in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended
Feb. 28, 2017
USD ($)
Mar. 31, 2018
USD ($)
a
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]        
Total Property, Plant and Equipment   $ 9,103,351   $ 9,316,495
Less: Accumulated Depreciation, Depletion and Amortization   2,481,535   3,526,742
Total Property, Plant and Equipment—Net   6,621,816   5,789,753
Impairment on Knox   0 $ 137,865  
Gas Segment [Member]        
Property, Plant and Equipment [Line Items]        
Intangible drilling cost   3,902,099   3,849,689
Proved gas properties   975,256   1,999,891
Gas gathering equipment   2,146,869   1,182,234
Unproved gas properties   929,875   919,733
Gas wells and related equipment   772,542   834,120
Surface land and other equipment   310,460   309,602
Other gas assets   66,250   221,226
Total Property, Plant and Equipment   9,103,351   9,316,495
Less: Accumulated Depreciation, Depletion and Amortization   2,481,535   3,526,742
Total Property, Plant and Equipment—Net   $ 6,621,816   $ 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]        
Undivided interest under joint development agreement   50.00%    
Drilling carry, working interest obligations   50.00%    
Joint Venture [Member] | Utica Shale [Member]        
Property, Plant and Equipment [Line Items]        
Net Utica Shale acres | a   125    
Joint Venture [Member] | Hess [Member]        
Property, Plant and Equipment [Line Items]        
Drilling commitment carry   $ 335,000