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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Property, Plant and Equipment [Abstract] |  |
Intangible Drilling Cost | $ 4,688,497 | $ 4,120,283
Gas Gathering Equipment | 2,463,866 | 2,126,895
Proved Gas Properties | 1,208,046 | 1,135,411
Gas Wells and Related Equipment | 1,042,000 | 859,359
Unproved Gas Properties | 755,590 | 927,667
Surface Land and Other Equipment | 226,285 | 238,487
Other | 187,722 | 159,326
Total | 10,572,006 | 9,567,428
Less: Accumulated Depreciation, Depletion and Amortization | 3,435,431 | 2,624,984
Total Property, Plant and Equipment—Net | $ 7,136,575 | $ 6,942,444

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