v3.26.1
Business Segments - Schedule of Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Revenue from production $ 926,332,000 $ 683,065,000 $ 1,658,686,000 $ 1,355,795,000  
Gain on sale of assets and other operating income 2,000,000.0 14,800,000 3,200,000 7,700,000  
Total revenues and other income 928,300,000 697,800,000 1,661,900,000 1,363,500,000  
Lease operating expenses          
Lease operating expenses and taxes other than income 115,300,000 147,500,000 238,700,000 293,400,000  
Repair and maintenance 18,500,000 15,000,000.0 31,500,000 26,700,000  
Workovers 9,900,000 53,100,000 17,000,000.0 100,500,000  
Total lease operating expenses 143,719,000 215,554,000 287,183,000 420,633,000  
Severance and ad valorem taxes 14,991,000 10,828,000 28,737,000 19,478,000  
Transportation, gathering and processing 45,274,000 54,070,000 92,335,000 102,921,000  
Selling and general expenses 38,700,000 36,900,000 73,500,000 67,800,000  
Exploration Expense [Abstract]          
Geological and geophysical 11,200,000 900,000 12,800,000 4,400,000  
Dry holes and previously suspended exploration costs 13,500,000 (900,000) 80,600,000 (700,000)  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 14,600,000 10,400,000 28,700,000 21,200,000  
Total exploration expenses 39,303,000 10,399,000 122,118,000 24,887,000  
Depreciation, depletion and amortization 262,100,000 259,300,000 516,500,000 453,500,000  
Impairment of assets 0 0 0 0  
Accretion of asset retirement obligations 14,870,000 14,432,000 29,384,000 28,477,000  
Other operating expenses 14,700,000 1,800,000 19,100,000 7,500,000  
Interest Income (2,900,000) (3,200,000) (5,400,000) (6,900,000)  
Interest expense, net of capitalization 24,917,000 25,053,000 53,894,000 48,576,000  
Income tax expense          
Current income tax expense 21,300,000 (3,800,000) 34,500,000 12,600,000  
Deferred income tax expense (benefit) 55,700,000 4,800,000 92,500,000 21,200,000  
Total income tax expense (benefit) 77,000,000.0 1,000,000.0 127,000,000.0 33,800,000  
Other segment costs (income) (7,900,000) 36,500,000 (14,600,000) 38,300,000  
Net income including noncontrolling interest 263,531,000 35,124,000 332,184,000 124,542,000  
Additions to property, plant, equipment 463,400,000 245,400,000 860,900,000 657,400,000  
Total assets at quarter-end 10,278,134,000 9,839,500,000 10,278,134,000 9,839,500,000 $ 9,832,626,000
Revenue from production          
Segment Reporting [Line Items]          
Revenue from production 926,332,000 683,065,000 1,658,686,000 1,355,795,000  
Revenue from production | Minimum          
Segment Reporting [Line Items]          
Revenue from production   683,000,000.0      
Operating Segments          
Segment Reporting [Line Items]          
Gain on sale of assets and other operating income 1,300,000 1,700,000 2,500,000 4,100,000  
Total revenues and other income 927,600,000 684,700,000 1,661,200,000 1,359,900,000  
Lease operating expenses          
Lease operating expenses and taxes other than income 115,300,000 147,500,000 238,700,000 293,400,000  
Repair and maintenance 18,500,000 15,000,000.0 31,500,000 26,700,000  
Workovers 9,900,000 53,100,000 17,000,000.0 100,500,000  
Total lease operating expenses 143,700,000 215,600,000 287,200,000 420,600,000  
Severance and ad valorem taxes 15,000,000.0 10,800,000 28,700,000 19,500,000  
Transportation, gathering and processing 45,300,000 54,100,000 92,300,000 102,900,000  
Selling and general expenses 17,300,000 13,100,000 32,300,000 23,000,000.0  
Exploration Expense [Abstract]          
Geological and geophysical 11,200,000 900,000 12,800,000 4,400,000  
Dry holes and previously suspended exploration costs 13,500,000 (900,000) 80,600,000 (700,000)  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 14,600,000 10,400,000 28,700,000 21,200,000  
Total exploration expenses 39,300,000 10,400,000 122,100,000 24,900,000  
Depreciation, depletion and amortization 259,700,000 257,600,000 511,700,000 449,400,000  
Accretion of asset retirement obligations 14,800,000 14,400,000 29,200,000 28,500,000  
Other operating expenses 16,700,000 600,000 21,100,000 4,400,000  
Interest Income (600,000) (500,000) (800,000) (900,000)  
Interest expense, net of capitalization 100,000 200,000 300,000 100,000  
Income tax expense          
Current income tax expense 16,400,000 1,200,000 27,400,000 15,500,000  
Deferred income tax expense (benefit) 62,600,000 16,300,000 104,900,000 41,400,000  
Total income tax expense (benefit) 79,000,000.0 17,500,000 132,300,000 56,900,000  
Other segment costs (income) 1,400,000 1,200,000 3,200,000 2,700,000  
Net income including noncontrolling interest 295,900,000 89,700,000 401,600,000 227,900,000  
Additions to property, plant, equipment 456,300,000 242,600,000 844,500,000 650,400,000  
Total assets at quarter-end 9,700,100,000 9,387,900,000 9,700,100,000 9,387,900,000  
Operating Segments | United States          
Segment Reporting [Line Items]          
Gain on sale of assets and other operating income 1,000,000.0 1,300,000 1,800,000 3,300,000  
Total revenues and other income 744,000,000.0 553,500,000 1,319,500,000 1,063,000,000  
Lease operating expenses          
Lease operating expenses and taxes other than income 69,700,000 100,000,000.0 150,500,000 200,300,000  
Repair and maintenance 17,800,000 13,900,000 30,100,000 24,100,000  
Workovers 6,000,000.0 52,600,000 10,700,000 99,700,000  
Total lease operating expenses 93,500,000 166,500,000 191,300,000 324,100,000  
Severance and ad valorem taxes 14,100,000 10,500,000 27,000,000.0 18,800,000  
Transportation, gathering and processing 24,600,000 30,300,000 49,700,000 59,000,000.0  
Selling and general expenses 7,600,000 4,800,000 13,100,000 6,800,000  
Exploration Expense [Abstract]          
Geological and geophysical 10,200,000 700,000 11,000,000.0 3,900,000  
Dry holes and previously suspended exploration costs (400,000) (1,000,000.0) (400,000) (800,000)  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 5,000,000.0 3,600,000 9,900,000 6,300,000  
Total exploration expenses 14,800,000 3,300,000 20,500,000 9,400,000  
Depreciation, depletion and amortization 220,500,000 218,300,000 437,400,000 377,600,000  
Accretion of asset retirement obligations 11,900,000 11,600,000 23,500,000 23,000,000.0  
Other operating expenses 16,400,000 1,300,000 20,400,000 4,000,000.0  
Interest Income (600,000) (500,000) (800,000) (900,000)  
Interest expense, net of capitalization 100,000 0 200,000 0  
Income tax expense          
Current income tax expense 1,900,000 700,000 2,900,000 1,300,000  
Deferred income tax expense (benefit) 64,100,000 19,200,000 101,400,000 43,700,000  
Total income tax expense (benefit) 66,000,000.0 19,900,000 104,300,000 45,000,000.0  
Other segment costs (income) 900,000 1,000,000.0 2,000,000.0 1,800,000  
Net income including noncontrolling interest 274,200,000 86,500,000 430,900,000 194,400,000  
Additions to property, plant, equipment 263,200,000 176,200,000 518,000,000.0 493,200,000  
Total assets at quarter-end 6,919,300,000 6,984,900,000 6,919,300,000 6,984,900,000  
Operating Segments | Canada          
Segment Reporting [Line Items]          
Gain on sale of assets and other operating income 300,000 400,000 700,000 800,000  
Total revenues and other income 183,600,000 128,300,000 338,800,000 294,000,000.0  
Lease operating expenses          
Lease operating expenses and taxes other than income 45,300,000 46,600,000 87,100,000 91,900,000  
Repair and maintenance 700,000 1,100,000 1,400,000 2,600,000  
Workovers 3,900,000 500,000 6,300,000 800,000  
Total lease operating expenses 49,900,000 48,200,000 94,800,000 95,300,000  
Severance and ad valorem taxes 900,000 300,000 1,700,000 700,000  
Transportation, gathering and processing 20,700,000 23,800,000 42,600,000 43,900,000  
Selling and general expenses 7,000,000.0 5,700,000 14,500,000 11,700,000  
Exploration Expense [Abstract]          
Geological and geophysical 0 0 0 0  
Dry holes and previously suspended exploration costs 0 0 0 0  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 0 0 0 100,000  
Total exploration expenses 0 0 0 100,000  
Depreciation, depletion and amortization 39,200,000 38,100,000 73,200,000 70,500,000  
Accretion of asset retirement obligations 2,700,000 2,600,000 5,300,000 5,100,000  
Other operating expenses 0 700,000 100,000 1,700,000  
Interest Income 0 0 0 0  
Interest expense, net of capitalization (100,000) 200,000 0 0  
Income tax expense          
Current income tax expense 14,500,000 300,000 24,200,000 14,000,000.0  
Deferred income tax expense (benefit) (3,200,000) (2,200,000) (1,600,000) (1,600,000)  
Total income tax expense (benefit) 11,300,000 (1,900,000) 22,600,000 12,400,000  
Other segment costs (income) 100,000 100,000 500,000 600,000  
Net income including noncontrolling interest 51,900,000 10,500,000 83,500,000 52,000,000.0  
Additions to property, plant, equipment 64,300,000 45,700,000 126,400,000 101,100,000  
Total assets at quarter-end 1,979,500,000 2,038,600,000 1,979,500,000 2,038,600,000  
Operating Segments | Other          
Segment Reporting [Line Items]          
Gain on sale of assets and other operating income 0 0 0 0  
Total revenues and other income 0 2,900,000 2,900,000 2,900,000  
Lease operating expenses          
Lease operating expenses and taxes other than income 300,000 900,000 1,100,000 1,200,000  
Repair and maintenance 0 0 0 0  
Workovers 0 0 0 0  
Total lease operating expenses 300,000 900,000 1,100,000 1,200,000  
Severance and ad valorem taxes 0 0 0 0  
Transportation, gathering and processing 0 0 0 0  
Selling and general expenses 2,700,000 2,600,000 4,700,000 4,500,000  
Exploration Expense [Abstract]          
Geological and geophysical 1,000,000.0 200,000 1,800,000 500,000  
Dry holes and previously suspended exploration costs 13,900,000 100,000 81,000,000.0 100,000  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 9,600,000 6,800,000 18,800,000 14,800,000  
Total exploration expenses 24,500,000 7,100,000 101,600,000 15,400,000  
Depreciation, depletion and amortization 0 1,200,000 1,100,000 1,300,000  
Accretion of asset retirement obligations 200,000 200,000 400,000 400,000  
Other operating expenses 300,000 (1,400,000) 600,000 (1,300,000)  
Interest Income 0 0 0 0  
Interest expense, net of capitalization 100,000 0 100,000 100,000  
Income tax expense          
Current income tax expense 0 200,000 300,000 200,000  
Deferred income tax expense (benefit) 1,700,000 (700,000) 5,100,000 (700,000)  
Total income tax expense (benefit) 1,700,000 (500,000) 5,400,000 (500,000)  
Other segment costs (income) 400,000 100,000 700,000 300,000  
Net income including noncontrolling interest (30,200,000) (7,300,000) (112,800,000) (18,500,000)  
Additions to property, plant, equipment 128,800,000 20,800,000 200,100,000 56,100,000  
Total assets at quarter-end 801,300,000 364,400,000 801,300,000 364,400,000  
Operating Segments | Revenue from production          
Segment Reporting [Line Items]          
Revenue from production 926,300,000 683,000,000.0 1,658,700,000 1,355,800,000  
Operating Segments | Revenue from production | United States          
Segment Reporting [Line Items]          
Revenue from production 743,000,000.0 552,200,000 1,317,700,000 1,059,700,000  
Operating Segments | Revenue from production | Canada          
Segment Reporting [Line Items]          
Revenue from production 183,300,000 127,900,000 338,100,000 293,200,000  
Operating Segments | Revenue from production | Other          
Segment Reporting [Line Items]          
Revenue from production 0 2,900,000 2,900,000 2,900,000  
Corporate and Discontinued Operations          
Segment Reporting [Line Items]          
Gain on sale of assets and other operating income 700,000 13,100,000 700,000 3,600,000  
Total revenues and other income 700,000 13,100,000 700,000 3,600,000  
Lease operating expenses          
Lease operating expenses and taxes other than income 0 0 0 0  
Repair and maintenance 0 0 0 0  
Workovers 0 0 0 0  
Total lease operating expenses 0 0 0 0  
Severance and ad valorem taxes 0 0 0 0  
Transportation, gathering and processing 0 0 0 0  
Selling and general expenses 21,400,000 23,800,000 41,200,000 44,800,000  
Exploration Expense [Abstract]          
Geological and geophysical 0 0 0 0  
Dry holes and previously suspended exploration costs 0 0 0 0  
Other exploratory costs, including undeveloped lease amortization and delay lease rentals 0 0 0 0  
Total exploration expenses 0 0 0 0  
Depreciation, depletion and amortization 2,400,000 1,700,000 4,800,000 4,100,000  
Accretion of asset retirement obligations 100,000 0 200,000 0  
Other operating expenses (2,000,000.0) 1,200,000 (2,000,000.0) 3,100,000  
Interest Income (2,300,000) (2,700,000) (4,600,000) (6,000,000.0)  
Interest expense, net of capitalization 24,800,000 24,900,000 53,600,000 48,500,000  
Income tax expense          
Current income tax expense 4,900,000 (5,000,000.0) 7,100,000 (2,900,000)  
Deferred income tax expense (benefit) (6,900,000) (11,500,000) (12,400,000) (20,200,000)  
Total income tax expense (benefit) (2,000,000.0) (16,500,000) (5,300,000) (23,100,000)  
Other segment costs (income) (9,300,000) 35,300,000 (17,800,000) 35,600,000  
Net income including noncontrolling interest (32,400,000) (54,600,000) (69,400,000) (103,400,000)  
Additions to property, plant, equipment 7,100,000 2,700,000 16,400,000 7,000,000.0  
Total assets at quarter-end 578,000,000.0 451,600,000 578,000,000.0 451,600,000  
Corporate and Discontinued Operations | Revenue from production          
Segment Reporting [Line Items]          
Revenue from production $ 0 $ 0 $ 0 $ 0