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v3.22.1

Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Total Assets | $ 10,541,737 |  | $ 10,304,940
External Revenues | 552,961 | $ 379,985 |
Income (Loss) | (65,486) | (266,824) |
Continuing operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 10,541,000 |  |
External Revenues | 553,000 | 380,000 |
Income (Loss) | (64,900) | (267,000) |
Discontinued operations, net of tax |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 700 |  |
External Revenues | 0 | 0 |
Income (Loss) | (600) | 200 |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 1,157,100 |  |
External Revenues | (320,500) | (214,300) |
Income (Loss) | (296,300) | (254,800) |
Exploration and production | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 9,383,900 |  |
External Revenues | 873,500 | 594,300 |
Income (Loss) | 231,400 | (12,200) |
Exploration and production | Operating Segments | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 6,832,000 |  |
External Revenues | 707,400 | 490,300 |
Income (Loss) | 252,900 | 119,000 |
Exploration and production | Operating Segments | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 2,309,800 |  |
External Revenues | 166,100 | 104,000 |
Income (Loss) | 22,700 | (124,300) |
Exploration and production | Operating Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 242,100 |  |
External Revenues | 0 | 0 |
Income (Loss) | $ (44,200) | $ (6,900) |

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |