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Business Segments - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest | $ 220,600 | $ 574,100 | $ 409,500 | $ (65,500) | $ 204,000 | $ 137,300 | $ (27,000) | $ (266,800) | $ 1,138,719 | $ 47,528 | $ (1,262,445)
Revenues from external customers |  |  |  |  |  |  |  |  | 3,932,662 | 2,299,281 | 1,967,341
Other income (expense) |  |  |  |  |  |  |  |  | 14,310 | (16,771) | (17,303)
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (150,759) | (221,773) | (169,423)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 309,464 | (5,862) | (293,741)
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 196,296 | 1,206,284
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 776,817 | 795,105 | 987,239
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 46,243 | 46,613 | 42,136
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 13,300 | 18,925 | 26,743
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 286,079 | (4,146) | (278,042)
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 1,063,300 | 585,300 | 756,600
Total assets at year-end | 10,308,952 |  |  |  | 10,304,940 |  |  |  | 10,308,952 | 10,304,940 | 10,620,900
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (2,100) | (1,200) | (7,200)
Revenues from external customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  |  | 0 | 0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets at year-end | 800 |  |  |  | 800 |  |  |  | 800 | 800 | 700
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (438,300) | (668,000) | (120,300)
Revenues from external customers |  |  |  |  |  |  |  |  | (314,400) | (519,400) | 207,900
Other income (expense) |  |  |  |  |  |  |  |  | 23,300 | (6,500) | (9,100)
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (150,400) | (221,600) | (168,500)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (107,800) | (178,600) | (30,200)
Impairment of assets |  |  |  |  |  |  |  |  |  | 7,000 | 14,100
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 12,900 | 13,000 | 22,300
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 0 | 0 | 0
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | (112,000) | (170,500) | (25,100)
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 21,900 | 0 | 0
Total assets at year-end | 1,034,600 |  |  |  | 1,220,800 |  |  |  | 1,034,600 | 1,220,800 | 1,032,900
Exploration and Production | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | 1,579,100 | 716,700 | (1,134,900)
Revenues from external customers |  |  |  |  |  |  |  |  | 4,247,100 | 2,818,700 | 1,759,400
Other income (expense) |  |  |  |  |  |  |  |  | (9,000) | (10,300) | (8,200)
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (400) | (200) | (900)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 417,300 | 172,700 | (263,500)
Impairment of assets |  |  |  |  |  |  |  |  |  | 189,300 | 1,192,200
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 763,900 | 782,100 | 964,900
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 46,200 | 46,600 | 42,100
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 13,300 | 18,900 | 26,700
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 398,100 | 166,400 | (252,900)
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 1,041,400 | 585,300 | 756,600
Total assets at year-end | 9,273,600 |  |  |  | 9,083,300 |  |  |  | 9,273,600 | 9,083,300 | 9,587,300
Exploration and Production | Operating Segments | United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | 1,521,900 | 766,300 | (1,014,300)
Revenues from external customers |  |  |  |  |  |  |  |  | 3,461,200 | 2,337,500 | 1,411,800
Other income (expense) |  |  |  |  |  |  |  |  | (6,600) | (11,600) | (9,900)
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (100) | 0 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 370,800 | 183,900 | (244,200)
Impairment of assets |  |  |  |  |  |  |  |  |  | 0 | 1,152,500
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 617,000 | 616,500 | 749,400
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 36,500 | 36,900 | 36,600
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 8,700 | 11,100 | 17,200
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 362,700 | 176,300 | (244,200)
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 838,600 | 519,500 | 623,100
Total assets at year-end | 6,930,600 |  |  |  | 6,591,600 |  |  |  | 6,930,600 | 6,591,600 | 6,915,500
Exploration and Production | Operating Segments | Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | 134,200 | (16,100) | (35,000)
Revenues from external customers |  |  |  |  |  |  |  |  | 762,900 | 476,300 | 345,800
Other income (expense) |  |  |  |  |  |  |  |  | (1,900) | (1,900) | 800
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | 0 | 0 | (500)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 43,600 | (1,700) | (21,400)
Impairment of assets |  |  |  |  |  |  |  |  |  | 171,300 | 0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 141,500 | 163,800 | 213,200
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 9,600 | 9,700 | 5,500
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 200 | 200 | 400
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 34,800 | (1,900) | (10,600)
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | 208,500 | 52,700 | 118,300
Total assets at year-end | 2,125,600 |  |  |  | 2,231,900 |  |  |  | 2,125,600 | 2,231,900 | 2,404,100
Exploration and Production | Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) including noncontrolling interest |  |  |  |  |  |  |  |  | (77,000) | (33,500) | (85,600)
Revenues from external customers |  |  |  |  |  |  |  |  | 23,000 | 4,900 | 1,800
Other income (expense) |  |  |  |  |  |  |  |  | (500) | 3,200 | 800
Interest expense, net of capitalization |  |  |  |  |  |  |  |  | (300) | (200) | (400)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 2,900 | (9,500) | 2,100
Impairment of assets |  |  |  |  |  |  |  |  |  | 18,000 | 39,700
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 5,400 | 1,800 | 2,300
Accretion of asset retirement obligations |  |  |  |  |  |  |  |  | 100 | 0 | 0
Amortization of undeveloped leases |  |  |  |  |  |  |  |  | 4,400 | 7,600 | 9,100
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 600 | (8,000) | 1,900
Additions to property, plant, equipment |  |  |  |  |  |  |  |  | (5,700) | 13,100 | 15,200
Total assets at year-end | $ 217,400 |  |  |  | $ 259,800 |  |  |  | $ 217,400 | $ 259,800 | $ 267,700

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