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Property, Plant and Equipment - Components (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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

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