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Property, Plant and Equipment - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Oil and Gas properties with proved reserves under the successful effort method.

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