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Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | $ 10,192,759 |  | $ 10,192,759 |  | $ 10,295,860
External Revenues |  | 498,319 | $ 485,546 | 1,683,238 | $ 1,329,688 |
Net income (loss) |  | (65,893) | (16,176) | (25,000) | (212,048) |
Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 10,169,600 |  | 10,169,600 |  |
External Revenues |  | 498,300 | 485,500 | 1,683,200 | 1,329,700 |
Net income (loss) |  | (66,300) | (14,600) | (26,200) | (211,200) |
Discontinued Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 23,200 |  | 23,200 |  |
Net income (loss) |  | 400 | (1,600) | 1,200 | (800) |
Corporate [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets |  | 1,124,200 |  | 1,124,200 |  |
External Revenues |  |  | (100) | 4,000 | 3,500 |
Net income (loss) |  | (99,900) | (39,600) | (302,800) | (111,700) |
Exploration and production [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 9,045,400 |  | 9,045,400 |  |
External Revenues | [1] | 498,300 | 485,600 | 1,679,200 | 1,326,200 |
Net income (loss) | [1] | 33,600 | 25,000 | 276,600 | (99,500) |
Exploration and production [Member] | Operating Segments [Member] | United States [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 5,439,100 |  | 5,439,100 |  |
External Revenues | [1] | 195,900 | 201,800 | 696,700 | 520,200 |
Net income (loss) | [1] | (19,900) | (27,100) | 11,000 | (158,500) |
Exploration and production [Member] | Operating Segments [Member] | Canada [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 1,711,100 |  | 1,711,100 |  |
External Revenues | [1] | 81,900 | 80,900 | 388,100 | 264,400 |
Net income (loss) | [1] | (3,200) | (4,800) | 102,600 | (36,900) |
Exploration and production [Member] | Operating Segments [Member] | Malaysia [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 1,755,300 |  | 1,755,300 |  |
External Revenues | [1] | 220,500 | 202,700 | 594,400 | 541,400 |
Net income (loss) | [1] | 67,700 | 65,000 | 173,900 | 135,100 |
Exploration and production [Member] | Operating Segments [Member] | Other Regions [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total Assets | [1] | 139,900 |  | 139,900 |  |
External Revenues | [1] |  | 200 |  | 200 |
Net income (loss) | [1] | $ (11,000) | $ (8,100) | $ (10,900) | $ (39,200) |
[1] | Additional details about results of oil and gas operations are presented in the tables on pages 29 and 30.

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