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Significant Accounting Policies - Impairment of Proved and Unproved Properties (Details) a in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) a well | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) a well | Dec. 31, 2018 USD ($)
Productive Wells [Line Items] |  |  |  |  |
Impairment of proved and unproved properties | $ 61,849 | $ 327,400 | $ 61,849 | $ 327,400 | $ 0
Impairment of unproved properties | $ 473,045 | $ 119,429 | 0 | 119,429 | 0
Exploration and Production Related Other Costs |  |  |  |  |
Productive Wells [Line Items] |  |  |  |  |
Exploration expense |  |  | $ 14,994 | $ 44,380 | $ 12,033
Marcellus Shale | Central Pennsylvania |  |  |  |  |
Productive Wells [Line Items] |  |  |  |  |
Number of operated wells | well |  | 56 |  | 56 |
Net acres of land | a |  | 51 |  | 51 |

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- Definition Number of producing oil wells and oil wells capable of production with working interest ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
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