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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Property, Plant and Equipment [Abstract] |  |
Intangible Drilling Cost | $ 4,844,817 | $ 4,688,497
Gas Gathering Equipment | 2,492,834 | 2,463,866
Proved Gas Properties | 1,212,247 | 1,208,046
Gas Wells and Related Equipment | 1,086,934 | 1,042,000
Unproved Gas Properties | 758,787 | 755,590
Surface Land and Other Equipment | 225,375 | 226,285
Other | 193,041 | 187,722
Total Property, Plant and Equipment | 10,814,035 | 10,572,006
Less: Accumulated Depreciation, Depletion and Amortization | 3,730,232 | 3,435,431
Total Property, Plant and Equipment—Net | $ 7,083,803 | $ 7,136,575

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