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Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Total Assets | $ 10,284,344 |  | $ 10,620,852
External Revenues | 379,985 | $ 1,003,728 |
Income (Loss) | (266,824) | (508,702) |
Assets/revenue/income (loss) from continuing operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 10,283,500 |  |
External Revenues | 380,000 | 1,003,700 |
Income (Loss) | (267,000) | (503,800) |
Discontinued operations, net of tax |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 800 |  |
External Revenues | 0 | 0 |
Income (Loss) | 200 | (4,900) |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 917,400 |  |
External Revenues | (214,300) | 400,700 |
Income (Loss) | (254,800) | 251,400 |
Exploration and production | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 9,366,100 |  |
External Revenues | 594,300 | 603,000 |
Income (Loss) | (12,200) | (755,200) |
Exploration and production | Operating Segments | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 6,737,800 |  |
External Revenues | 490,300 | 511,500 |
Income (Loss) | 119,000 | (696,000) |
Exploration and production | Operating Segments | Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 2,364,000 |  |
External Revenues | 104,000 | 89,700 |
Income (Loss) | (124,300) | (6,900) |
Exploration and production | Operating Segments | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Assets | 264,300 |  |
External Revenues | 0 | 1,800 |
Income (Loss) | $ (6,900) | $ (52,300) |

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