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Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Well costs |  | $ 186,623 | $ 187,859 | $ 181,616 | $ 217,326
Exploratory well costs capitalized more than one year |  | 183,300 |  |  |
Impairment of oil and gas Properties | $ 171,300 | 171,296 | 1,206,284 | $ 1,206,300 |
Proceeds from sale of oil and gas property and equipment | $ 267,700 |  |  |  |
Vietnam |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 92,300 |  |  |
United States |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 45,000 |  |  |
Impairment of oil and gas Properties |  | 0 | 1,152,515 |  |
Brunei |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 25,900 |  |  |
MEXICO |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 15,300 |  |  |
Canada |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Exploratory well costs capitalized more than one year |  | 4,800 |  |  |
Impairment of oil and gas Properties |  | $ 171,296 | $ 0 |  |

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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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- Definition The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. + 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 b -URI http://asc.fasb.org/extlink&oid=123377692&loc=SL6806780-109447 + 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=123570139&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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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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