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Property, Plant and Equipment - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Intangible Drilling Cost	$ 5,179,078	$ 4,965,252
Gas Gathering Equipment	2,464,392	2,510,917
Proved Gas Properties	1,286,205	1,253,094
Gas Wells and Related Equipment	1,181,664	1,120,061
Unproved Gas Properties	710,470	725,705
Surface Land and Other Equipment	196,399	199,322
Other	188,532	189,645
Total Property, Plant and Equipment	11,206,740	10,963,996
Less: Accumulated Depreciation, Depletion and Amortization	4,246,423	3,938,451
Total Property, Plant and Equipment—Net	$ 6,960,317	$ 7,025,545

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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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