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Business Segments - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest | $ (162,700) | $ (266,600) | $ (324,400) | $ (508,700) | $ (54,400) | $ 1,111,700 | $ 123,200 | $ 72,800 | $ (1,262,445) | $ 1,253,302 | $ 419,486 | [1]
Revenues from external customers |  |  |  |  |  |  |  |  | 1,967,341 | 2,829,053 | 1,791,401 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | (17,303) | (22,520) | 7,774 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (169,423) | (219,275) | (180,359) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (293,741) | 14,683 | (126,136) |
Impairment of assets |  |  |  |  |  |  |  |  | 1,206,284 | 0 | 20,000 | [1]
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 987,239 | 1,147,842 | 775,614 | [1]
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 42,136 | 40,506 | 27,119 | [1]
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 26,743 | 27,973 | 40,177 | [1]
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | (278,042) | 28,530 | (177,627) | [1]
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 756,600 | 2,560,800 | 1,894,500 |
Total assets at year-end | 10,620,852 |  |  |  | 11,718,504 |  |  |  | 10,620,852 | 11,718,504 | 11,052,600 |
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 40,100 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | (183,200) |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 20,000 |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (7,200) | 1,064,500 | 250,300 |
Revenues from external customers |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 0 | 0 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | 0 | 0 |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 0 | 0 | 138,600 |
Total assets at year-end | 700 |  |  |  | 16,700 |  |  |  | 700 | 16,700 | 1,691,200 |
Discontinued Operations | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 0 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | 0 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (120,300) | (271,800) | (108,200) |
Revenues from external customers |  |  |  |  |  |  |  |  | 207,900 | 3,500 | (34,000) |
Interest and other income (loss) |  |  |  |  |  |  |  |  | (9,100) | (6,700) | 7,800 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (168,500) | (218,800) | (180,600) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (30,200) | (85,600) | (183,400) |
Impairment of assets |  |  |  |  |  |  |  |  | 14,100 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 22,300 | 22,600 | 20,200 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 0 | 0 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | (25,100) | (83,900) |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 0 | 13,600 | 22,700 |
Total assets at year-end | 1,032,900 |  |  |  | 1,046,200 |  |  |  | 1,032,900 | 1,046,200 | 1,118,500 |
Corporate and Other | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 0 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | (242,100) |
Exploration and Production | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (1,134,900) | 460,600 | 277,400 |
Revenues from external customers |  |  |  |  |  |  |  |  | 1,759,400 | 2,825,600 | 1,825,400 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | (8,200) | (15,800) | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (900) | (500) | 200 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (263,500) | 100,300 | 57,300 |
Impairment of assets |  |  |  |  |  |  |  |  | 1,192,200 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 964,900 | 1,125,200 | 755,400 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 42,100 | 40,500 | 27,100 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 26,700 | 28,000 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | (252,900) | 112,400 |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 756,600 | 2,547,200 | 1,733,200 |
Total assets at year-end | 9,587,300 |  |  |  | 10,655,600 |  |  |  | 9,587,300 | 10,655,600 | 8,242,900 |
Exploration and Production | Operating Segments | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 40,100 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | 58,900 |
Exploration and Production | Operating Segments | UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (1,014,300) | 518,400 | 242,900 |
Revenues from external customers |  |  |  |  |  |  |  |  | 1,411,800 | 2,367,000 | 1,332,700 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | (9,900) | (13,400) | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (244,200) | 115,600 | 68,100 |
Impairment of assets |  |  |  |  |  |  |  |  | 1,152,500 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 749,400 | 878,700 | 519,500 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 36,600 | 34,400 | 19,500 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 17,200 | 23,100 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | (244,200) | 111,800 |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 623,100 | 2,193,300 | 1,343,500 |
Total assets at year-end | 6,915,500 |  |  |  | 8,043,300 |  |  |  | 6,915,500 | 8,043,300 | 6,342,900 |
Exploration and Production | Operating Segments | UNITED STATES | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 36,800 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | 68,100 |
Exploration and Production | Operating Segments | Canada |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (35,000) | (4,300) | 51,100 |
Revenues from external customers |  |  |  |  |  |  |  |  | 345,800 | 447,000 | 470,500 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | 800 | (1,500) | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (500) | (100) | 0 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (21,400) | (2,900) | 14,500 |
Impairment of assets |  |  |  |  |  |  |  |  | 0 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 213,200 | 243,000 | 232,400 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 5,500 | 6,100 | 7,600 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 400 | 1,300 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | (10,600) | 14,000 |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 118,300 | 284,100 | 373,800 |
Total assets at year-end | 2,404,100 |  |  |  | 2,303,700 |  |  |  | 2,404,100 | 2,303,700 | 1,711,900 |
Exploration and Production | Operating Segments | Canada | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 800 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | 16,500 |
Exploration and Production | Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (85,600) | (53,500) | (16,600) |
Revenues from external customers |  |  |  |  |  |  |  |  | 1,800 | 11,600 | 22,200 |
Interest and other income (loss) |  |  |  |  |  |  |  |  | 800 | (900) | 0 |
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (400) | (400) | 200 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 2,100 | (12,400) | (25,300) |
Impairment of assets |  |  |  |  |  |  |  |  | 39,700 |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 2,300 | 3,500 | 3,500 |
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 9,100 | 3,600 |  |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  | 1,900 | (13,400) |  |
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 15,200 | 69,800 | 15,900 |
Total assets at year-end | $ 267,700 |  |  |  | $ 308,600 |  |  |  | $ 267,700 | $ 308,600 | 188,100 |
Exploration and Production | Operating Segments | Other | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortization of undeveloped leases |  |  |  |  |  |  |  |  |  |  | 2,500 |
Deferred income tax charge (benefit) |  |  |  |  |  |  |  |  |  |  | $ (25,700) |
[1] | Reclassified to conform with current presentation

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