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Property, Plant and Equipment - Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Intangible Drilling Cost $ 5,127,989 $ 4,965,252
Gas Gathering Equipment 2,459,197 2,510,917
Proved Gas Properties 1,271,774 1,253,094
Gas Wells and Related Equipment 1,164,025 1,120,061
Unproved Gas Properties 718,042 725,705
Surface Land and Other Equipment 197,956 199,322
Other 189,513 189,645
Total Property, Plant and Equipment 11,128,496 10,963,996
Less: Accumulated Depreciation, Depletion and Amortization 4,119,856 3,938,451
Total Property, Plant and Equipment—Net $ 7,008,640 $ 7,025,545