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Property, Plant and Equipment (Aging of Capitalized Exploratory Well Costs) (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) well project | Sep. 30, 2020 USD ($) well project | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 186,623 | $ 187,859 | $ 181,616 | $ 217,326
No. of Wells (in wells) | well | 13 | 12 |  |
No. of Projects (in projects) | project | 7 | 5 |  |
Zero to one year |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 3,297 | $ 8,000 |  |
No. of Wells (in wells) | well | 2 | 1 |  |
No. of Projects (in projects) | project | 2 | 0 |  |
One to two years |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 0 | $ 54,334 |  |
No. of Wells (in wells) | well | 0 | 5 |  |
No. of Projects (in projects) | project | 0 | 5 |  |
Two to three years |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 53,078 | $ 0 |  |
No. of Wells (in wells) | well | 5 | 0 |  |
No. of Projects (in projects) | project | 5 | 0 |  |
Three years or more |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 130,248 | $ 125,525 |  |
No. of Wells (in wells) | well | 6 | 6 |  |
No. of Projects (in projects) | project | 0 | 0 |  |

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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=123377692&loc=SL6806780-109447 + Details
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