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Property, Plant and Equipment - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Property, Plant and Equipment [Abstract] |  |
Intangible Drilling Cost | $ 4,965,252 | $ 4,688,497
Gas Gathering Equipment | 2,510,917 | 2,463,866
Proved Gas Properties | 1,253,094 | 1,208,046
Gas Wells and Related Equipment | 1,120,061 | 1,042,000
Unproved Gas Properties | 725,705 | 755,590
Surface Land and Other Equipment | 199,322 | 226,285
Other | 189,645 | 187,722
Total | 10,963,996 | 10,572,006
Less: Accumulated Depreciation, Depletion and Amortization | 3,938,451 | 3,435,431
Total Property, Plant and Equipment—Net | $ 7,025,545 | $ 7,136,575

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