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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Property, Plant and Equipment [Abstract] |  |
Intangible Drilling Cost | $ 4,566,206 | $ 4,120,283
Gas Gathering Equipment | 2,399,883 | 2,126,895
Proved Gas Properties | 1,157,361 | 1,135,411
Gas Wells and Related Equipment | 1,047,139 | 859,359
Unproved Gas Properties | 949,529 | 927,667
Surface Land and Other Equipment | 233,812 | 238,487
Other | 158,368 | 159,326
Total Property, Plant and Equipment | 10,512,298 | 9,567,428
Less: Accumulated Depreciation, Depletion and Amortization | 2,981,723 | 2,624,984
Total Property, Plant and Equipment—Net | $ 7,530,575 | $ 6,942,444

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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