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Business Segments (Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets |  | $ 9,945,449 |  |  | $ 9,945,449 |  |  |  |  | $ 9,860,942
External Revenues |  | 618,194 | $ 508,279 | [1] | 1,203,799 | $ 1,184,919 | [1] |  |  |
Net income (loss) |  | 45,518 | (17,571) | [1] | 213,771 | 40,893 | [1] |  |  |
Gain (loss) on sale of assets |  | 220 | (1,333) |  | (118) | 130,648 |  |  |  |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets |  | 9,923,700 |  |  | 9,923,700 |  |  |  |  |
External Revenues |  | 618,200 | 508,300 |  |  |  |  | $ 1,203,800 | $ 1,184,900 |
Net income (loss) |  | 45,900 | (17,400) |  |  |  |  | 214,600 | 40,100 |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets |  | 21,700 |  |  | 21,700 |  |  |  |  |
Net income (loss) |  | (400) | (200) |  |  |  |  | (800) | 800 |
Corporate [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [2] | 1,597,300 |  |  | 1,597,300 |  |  |  |  |
External Revenues | [2] | (37,600) | 31,100 |  |  |  |  | (59,300) | 68,200 |
Net income (loss) | [2] | (105,300) | (67,900) |  |  |  |  | (52,200) | (161,500) |
Exploration And Production Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [3] | 8,326,400 |  |  | 8,326,400 |  |  |  |  |
External Revenues | [3] | 655,800 | 477,200 |  |  |  |  | 1,263,100 | 1,116,700 |
Net income (loss) | [3] | 151,200 | 50,500 |  |  |  |  | 266,800 | 201,600 |
Exploration And Production Segment [Member] | Operating Segments [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [3] | 4,799,100 |  |  | 4,799,100 |  |  |  |  |
External Revenues | [3] | 318,800 | 212,500 |  |  |  |  | 596,900 | 436,700 |
Net income (loss) | [3] | 72,600 | (9,600) |  |  |  |  | 108,700 | (10,600) |
Exploration And Production Segment [Member] | Operating Segments [Member] | Canada [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [3],[4] | 1,745,600 |  |  | 1,745,600 |  |  |  |  |
External Revenues | [3],[4] | 108,400 | 88,200 |  |  |  |  | 226,700 | 306,100 |
Net income (loss) | [3],[4] | 9,700 | 5,200 |  |  |  |  | 34,300 | 105,800 |
Exploration And Production Segment [Member] | Operating Segments [Member] | Malaysia [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [3] | 1,621,700 |  |  | 1,621,700 |  |  |  |  |
External Revenues | [3] | 228,600 | 176,500 |  |  |  |  | 439,500 | 373,900 |
Net income (loss) | [3] | 83,900 | 47,700 |  |  |  |  | 154,300 | 106,300 |
Exploration And Production Segment [Member] | Operating Segments [Member] | Other Regions [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Total Assets | [3] | 160,000 |  |  | $ 160,000 |  |  |  |  |
Net income (loss) | [3] | $ (15,000) | $ 7,200 |  |  |  |  | $ (30,500) | $ 100 |
Western Canada [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | $ 132,400 |  |  |  | $ 132,400
[1] | Reclassified to conform to current presentation (see Notes A and B).
[2] | In 2018, the Company reported realized and unrealized gains and losses on crude oil contracts in the Corporate segment (previously reported in the Exploration and production business) to reflect how segments are currently evaluated, how resources are allocated and how risk is managed by the Company. The 2017 amounts have been reclassified to reflect comparable disclosure.
[3] | Additional details about results of oil and gas operations are presented in the tables on pages 1 and 30.
[4] | Revenue for the six months ended June 30, 2017 includes a pretax gain of $132.4 million related to the sale of Seal heavy oil assets in Canada.

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