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Property, Plant, and Equipment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of Exploration and Production Properties | $ 0 | $ 0 | $ 0 | $ 61,849
Southwest Pennsylvania CBM Asset Group [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of Exploration and Production Properties |  |  |  | $ 61,849

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Costs related to the impairment of oil and gas properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(3)(ii)(A)(1)) -URI http://asc.fasb.org/extlink&oid=123726172&loc=d3e511914-122862 + Details
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- Details
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