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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Property, Plant and Equipment [Abstract] |  |
Intangible Drilling Cost | $ 4,411,513 | $ 4,120,283
Proved Gas Properties | 1,150,723 | 1,135,411
Gas Gathering Equipment | 2,324,938 | 2,126,895
Unproved Gas Properties | 946,114 | 927,667
Gas Wells and Related Equipment | 983,214 | 859,359
Surface Land and Other Equipment | 236,141 | 238,487
Other Gas Assets | 150,846 | 159,326
Total Property, Plant and Equipment | 10,203,489 | 9,567,428
Less: Accumulated Depreciation, Depletion and Amortization | 2,863,627 | 2,624,984
Total Property, Plant and Equipment—Net | $ 7,339,862 | $ 6,942,444

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