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Property, Plant and Equipment - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Intangible Drilling Cost $ 5,056,060 $ 4,965,252
Gas Gathering Equipment 2,519,293 2,510,917
Proved Gas Properties 1,270,178 1,253,094
Gas Wells and Related Equipment 1,138,212 1,120,061
Unproved Gas Properties 711,881 725,705
Surface Land and Other Equipment 199,147 199,322
Other 189,587 189,645
Total Property, Plant and Equipment 11,084,358 10,963,996
Less: Accumulated Depreciation, Depletion and Amortization 4,064,594 3,938,451
Total Property, Plant and Equipment—Net $ 7,019,764 $ 7,025,545