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Properties and Equipment, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Abstract] |  |
Proved oil and gas properties | $ 7,531,941 | $ 7,068,605
Unproved oil and gas properties | 28,610 | 49,829
Land, buildings and other equipment | 96,245 | 92,566
Properties and equipment, gross, total | 7,656,796 | 7,211,000
Accumulated depreciation, depletion and amortization | (3,430,882) | (3,166,394)
Properties and equipment, net | $ 4,225,914 | $ 4,044,606
Costs capitalized period | 1 year |

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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=120391452&loc=d3e13212-122682 + Details
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