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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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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Surface Land And Other Equipment

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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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