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Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | $ 10,136,801 |  | $ 10,136,801 |  | $ 10,295,860
External Revenues |  | 474,497 | $ 437,462 | 1,139,116 | $ 867,757 |
Net income (loss) |  | (17,571) | 2,930 | 40,893 | (195,872) |
Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 10,114,600 |  | 10,114,600 |  |
External Revenues |  | 474,500 | 437,500 | 1,139,100 | 867,800 |
Net income (loss) |  | (17,400) | 2,900 | 40,100 | (196,600) |
Discontinued Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 22,200 |  | 22,200 |  |
Net income (loss) |  | (200) |  | 800 | 700 |
Corporate [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 1,229,900 |  | 1,229,900 |  |
External Revenues |  | (29,700) | 26,100 | (41,700) | 27,200 |
Net income (loss) |  | (85,500) | (29,300) | (203,100) | (72,200) |
Exploration and production [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 8,884,700 |  | 8,884,700 |  |
External Revenues | [1] | 504,200 | 411,400 | 1,180,800 | 840,600 |
Net income (loss) | [1] | 68,100 | 32,200 | 243,200 | (124,400) |
Exploration and production [Member] | Operating Segments [Member] | United States [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 5,324,400 |  | 5,324,400 |  |
External Revenues | [1] | 239,500 | 143,600 | 500,800 | 318,300 |
Net income (loss) | [1] | 8,000 | (65,700) | 31,000 | (131,400) |
Exploration and production [Member] | Operating Segments [Member] | Canada [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 1,629,200 |  | 1,629,200 |  |
External Revenues | [1] | 88,200 | 77,400 | 306,100 | 183,500 |
Net income (loss) | [1] | 5,200 | 55,300 | 105,800 | (31,900) |
Exploration and production [Member] | Operating Segments [Member] | Malaysia [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 1,795,000 |  | 1,795,000 |  |
External Revenues | [1] | 176,500 | 190,500 | 373,900 | 338,800 |
Net income (loss) | [1] | 47,700 | 47,700 | 106,300 | 70,100 |
Exploration and production [Member] | Operating Segments [Member] | Other Regions [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 136,100 |  | 136,100 |  |
External Revenues | [1] |  | (100) |  |  |
Net income (loss) | [1] | $ 7,200 | $ (5,100) | $ 100 | $ (31,200) |
[1] | Additional details about results of oil and gas operations are presented in the tables on pages 27 and 28.

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