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Property, Plant And Equipment - Aging of Capitalized Exploratory Well Costs (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2020 USD ($) project well | Dec. 31, 2019 USD ($) well project | Dec. 31, 2018 USD ($) project well | Dec. 31, 2017 USD ($)
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 181,616 | $ 217,326 | $ 207,855 | $ 155,103
No. of Wells (in wells) | well | 11 | 11 | 9 |
No. of Projects (in projects) | project | 5 | 5 | 5 |
Zero to one year |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 0 | $ 63,409 | $ 61,096 |
No. of Wells (in wells) | well | 0 | 5 | 1 |
No. of Projects (in projects) | project | 0 | 5 | 1 |
One to two years |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 54,220 | $ 0 | $ 40,523 |
No. of Wells (in wells) | well | 5 | 0 | 3 |
No. of Projects (in projects) | project | 5 | 0 | 2 |
Two to three years |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 0 | $ 27,396 | $ 5,208 |
No. of Wells (in wells) | well | 0 | 1 | 1 |
No. of Projects (in projects) | project | 0 | 0 | 1 |
Three years or more |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 127,396 | $ 126,521 | $ 101,028 |
No. of Wells (in wells) | well | 6 | 5 | 4 |
No. of Projects (in projects) | project | 0 | 0 | 1 |

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- Definition Projects that have Exploratory Well Costs that have been Capitalized + References No definition available. + Details
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- Definition Number of exploratory oil and gas wells capable of producing either oil or gas in sufficient quantity to justify completion as oil or gas well. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (1) + Details
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- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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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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