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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
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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Drilling Cost

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Gas Wells and Related Equipment

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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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