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Properties and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Abstract] |  |
Proved oil and gas properties | $ 5,489,836 | $ 4,932,512
Unproved oil and gas properties | 199,219 | 190,474
Gathering and pipeline systems | 1,569 | 1,569
Land, building and other equipment | 86,953 | 82,670
Properties and equipment, gross, total | 5,777,577 | 5,207,225
Accumulated depreciation, depletion and amortization | (2,411,340) | (2,135,021)
Properties and equipment, net | $ 3,366,237 | $ 3,072,204

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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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