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Property, Plant and Equipment (Schedule of Recognized Impairments) (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
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of oil and gas Properties | $ 171,300 | $ 171,296 | $ 1,206,284 | $ 1,206,300
Corporate |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of oil and gas Properties |  | 0 | 14,060 |
United States |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of oil and gas Properties |  | 0 | 1,152,515 |
Canada |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of oil and gas Properties |  | 171,296 | 0 |
Other Foreign |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of oil and gas Properties |  | $ 0 | $ 39,709 |

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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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