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Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | [1]
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | $ 11,983,117 |  |  | $ 11,052,587
External Revenues |  | 591,004 | $ 374,790 | [1] |
Income (loss) |  | 40,182 | 168,253 | [1] |
Continuing Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 10,103,500 |  |  |
External Revenues |  | 591,000 | 374,800 |  |
Income (loss) |  | 23,000 | 90,600 |  |
Discontinued Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 1,879,600 |  |  |
Income (loss) |  | 49,800 | 77,700 |  |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 1,010,000 |  |  |
External Revenues |  |  | (21,600) |  |
Income (loss) |  | (72,400) | 45,400 |  |
Exploration And Production Segment [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | [2] | 9,093,500 |  |  |
External Revenues | [2] | 591,000 | 396,400 |  |
Income (loss) | [2] | 95,400 | 45,200 |  |
Exploration And Production Segment [Member] | Operating Segments [Member] | United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | [2] | 6,615,500 |  |  |
External Revenues | [2] | 469,200 | 278,100 |  |
Income (loss) | [2] | 116,200 | 36,200 |  |
Exploration And Production Segment [Member] | Operating Segments [Member] | Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | [2] | 2,252,800 |  |  |
External Revenues | [2] | 118,900 | 118,300 |  |
Income (loss) | [2] | 7,500 | 24,400 |  |
Exploration And Production Segment [Member] | Operating Segments [Member] | Other Regions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | [2] | 225,200 |  |  |
External Revenues | [2] | 2,900 |  |  |
Income (loss) | [2] | $ (28,300) | $ (15,400) |  |
[1] | Reclassified to conform to current presentation (see Note A).
[2] | Additional details about results of oil and gas operations are presented in the tables on pages 29.

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