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Business Segments (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | $ 12,200,000 | $ 5,200,000 | $ 19,900,000 | $ 8,500,000 |
Revenues from external customers | 733,200,000 | 758,300,000 | 2,096,700,000 | 2,357,500,000 |
Lease operating expenses |  |  |  |  |
Lease operating expenses and taxes other than income | 137,200,000 | 160,000,000.0 | 430,600,000 | 491,700,000 |
Repair and maintenance | 15,300,000 | 16,900,000 | 42,000,000.0 | 45,100,000 |
Workovers | 31,900,000 | 46,000,000.0 | 132,400,000 | 180,000,000.0 |
Total lease operating expenses | 184,353,000 | 222,886,000 | 604,986,000 | 716,778,000 |
Severance and ad valorem taxes | 12,288,000 | 10,503,000 | 31,766,000 | 31,006,000 |
Transportation, gathering and processing | 48,146,000 | 47,438,000 | 151,067,000 | 157,461,000 |
Costs of purchased natural gas | 0 | 0 | 0 | 3,147,000 |
Selling and general expenses | 30,900,000 | 24,900,000 | 98,700,000 | 78,900,000 |
Exploration Expenses |  |  |  |  |
Geological and geophysical | 20,300,000 | 12,800,000 | 24,700,000 | 22,300,000 |
Dry holes and previously suspended exploration costs | 800,000 | 11,200,000 | 100,000 | 69,600,000 |
Other exploratory costs, including undeveloped lease amortization and delay lease rentals | 11,400,000 | 7,300,000 | 32,600,000 | 26,500,000 |
Total exploration expenses | 32,502,000 | 31,284,000 | 57,389,000 | 118,390,000 |
Depreciation, depletion and amortization | 283,500,000 | 223,600,000 | 736,900,000 | 650,300,000 |
Impairment of assets | 115,002,000 | 0 | 115,002,000 | 34,528,000 |
Accretion of asset retirement obligations | 14,676,000 | 13,241,000 | 43,153,000 | 39,068,000 |
Other operating expenses | 5,900,000 | 5,500,000 | 13,400,000 | 10,500,000 |
Interest Income | (3,100,000) | (3,900,000) | (10,000,000.0) | (30,200,000) |
Interest expense, net of capitalization | 24,726,000 | 21,258,000 | 73,302,000 | 62,265,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | 2,100,000 | 11,000,000.0 | 14,600,000 | 19,800,000 |
Deferred income tax expense (benefit) | 2,100,000 | (8,900,000) | 23,300,000 | 45,100,000 |
Total income tax expense (benefit) | 4,200,000 | 2,100,000 | 37,900,000 | 64,900,000 |
Other segment costs (income) | (11,600,000) | 8,300,000 | 26,800,000 | (1,600,000) |
Net income (loss) including noncontrolling interest | (8,316,000) | 151,112,000 | 116,226,000 | 422,032,000 |
Additions to property, plant, equipment | 181,000,000.0 | 172,200,000 | 817,000,000.0 | 695,200,000 |
Total assets at quarter-end | 9,732,762,000 | 9,716,400,000 | 9,732,762,000 | 9,716,400,000 | $ 9,667,479,000
Minimum |  |  |  |  |
Exploration Expenses |  |  |  |  |
Interest expense, net of capitalization |  | 21,300,000 |  |  |
Income tax expense |  |  |  |  |
Net income (loss) including noncontrolling interest |  | 151,100,000 |  |  |
Maximum |  |  |  |  |
Lease operating expenses |  |  |  |  |
Transportation, gathering and processing |  | 47,500,000 |  |  |
Revenue from production |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | 721,000,000.0 | 753,100,000 | 2,076,800,000 | 2,345,300,000 |
Sales of purchased natural gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | 3,700,000 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | 800,000 | 1,000,000.0 | 4,900,000 | 4,300,000 |
Revenues from external customers | 721,800,000 | 754,100,000 | 2,081,700,000 | 2,353,300,000 |
Lease operating expenses |  |  |  |  |
Lease operating expenses and taxes other than income | 137,200,000 | 160,000,000.0 | 430,600,000 | 491,700,000 |
Repair and maintenance | 15,300,000 | 16,900,000 | 42,000,000.0 | 45,100,000 |
Workovers | 31,900,000 | 46,000,000.0 | 132,400,000 | 180,000,000.0 |
Total lease operating expenses | 184,400,000 | 222,900,000 | 605,000,000.0 | 716,800,000 |
Severance and ad valorem taxes | 12,300,000 | 10,500,000 | 31,800,000 | 31,000,000.0 |
Transportation, gathering and processing | 48,100,000 | 47,500,000 | 151,100,000 | 157,500,000 |
Costs of purchased natural gas |  |  |  | 3,100,000 |
Selling and general expenses | 9,500,000 | 4,900,000 | 32,500,000 | 13,900,000 |
Exploration Expenses |  |  |  |  |
Geological and geophysical | 20,300,000 | 12,800,000 | 24,700,000 | 22,300,000 |
Dry holes and previously suspended exploration costs | 800,000 | 11,200,000 | 100,000 | 69,600,000 |
Other exploratory costs, including undeveloped lease amortization and delay lease rentals | 11,400,000 | 7,300,000 | 32,600,000 | 26,500,000 |
Total exploration expenses | 32,500,000 | 31,300,000 | 57,400,000 | 118,400,000 |
Depreciation, depletion and amortization | 281,400,000 | 222,100,000 | 730,700,000 | 643,300,000 |
Impairment of assets |  | 0 | 115,000,000.0 | 34,500,000 |
Accretion of asset retirement obligations | 14,600,000 | 13,200,000 | 43,100,000 | 39,000,000.0 |
Other operating expenses | 6,000,000.0 | 5,400,000 | 10,400,000 | 10,700,000 |
Interest Income | (400,000) | (800,000) | (1,300,000) | (21,600,000) |
Interest expense, net of capitalization | 100,000 | 300,000 | 200,000 | 600,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | (700,000) | 8,900,000 | 14,700,000 | 13,600,000 |
Deferred income tax expense (benefit) | 7,300,000 | 600,000 | 48,700,000 | 73,900,000 |
Total income tax expense (benefit) | 6,600,000 | 9,500,000 | 63,400,000 | 87,500,000 |
Other segment costs (income) | 900,000 | 1,900,000 | 3,700,000 | 5,600,000 |
Net income (loss) including noncontrolling interest | 10,800,000 | 185,400,000 | 238,700,000 | 513,000,000.0 |
Additions to property, plant, equipment | 178,700,000 | 164,200,000 | 807,800,000 | 678,800,000 |
Total assets at quarter-end | 9,241,700,000 | 9,397,900,000 | 9,241,700,000 | 9,397,900,000 |
Operating Segments | United States |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | 300,000 | 500,000 | 3,600,000 | 3,100,000 |
Revenues from external customers | 613,700,000 | 597,000,000.0 | 1,676,700,000 | 1,936,100,000 |
Lease operating expenses |  |  |  |  |
Lease operating expenses and taxes other than income | 95,600,000 | 108,000,000.0 | 295,900,000 | 348,600,000 |
Repair and maintenance | 13,900,000 | 15,100,000 | 38,000,000.0 | 41,900,000 |
Workovers | 31,800,000 | 45,700,000 | 131,500,000 | 177,200,000 |
Total lease operating expenses | 141,300,000 | 168,800,000 | 465,400,000 | 567,700,000 |
Severance and ad valorem taxes | 11,900,000 | 10,100,000 | 30,700,000 | 29,900,000 |
Transportation, gathering and processing | 23,300,000 | 26,300,000 | 82,400,000 | 97,100,000 |
Costs of purchased natural gas |  |  |  | 0 |
Selling and general expenses | 1,900,000 | (1,700,000) | 8,700,000 | (5,200,000) |
Exploration Expenses |  |  |  |  |
Geological and geophysical | 19,100,000 | 9,900,000 | 23,000,000.0 | 13,500,000 |
Dry holes and previously suspended exploration costs | (100,000) | 10,800,000 | (900,000) | 67,900,000 |
Other exploratory costs, including undeveloped lease amortization and delay lease rentals | 3,500,000 | 2,500,000 | 9,800,000 | 9,600,000 |
Total exploration expenses | 22,500,000 | 23,200,000 | 31,900,000 | 91,000,000.0 |
Depreciation, depletion and amortization | 242,100,000 | 179,300,000 | 619,700,000 | 528,300,000 |
Impairment of assets |  | 0 | 115,000,000.0 | 34,500,000 |
Accretion of asset retirement obligations | 11,800,000 | 10,900,000 | 34,800,000 | 32,000,000.0 |
Other operating expenses | 5,700,000 | 4,800,000 | 9,700,000 | 8,000,000.0 |
Interest Income | (400,000) | (800,000) | (1,300,000) | (21,600,000) |
Interest expense, net of capitalization | 0 | 300,000 | 0 | 300,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | 1,000,000.0 | 800,000 | 2,200,000 | 2,900,000 |
Deferred income tax expense (benefit) | 7,900,000 | 34,400,000 | 51,600,000 | 106,900,000 |
Total income tax expense (benefit) | 8,900,000 | 35,200,000 | 53,800,000 | 109,800,000 |
Other segment costs (income) | 800,000 | 1,800,000 | 2,600,000 | 5,300,000 |
Net income (loss) including noncontrolling interest | 28,900,000 | 138,800,000 | 223,300,000 | 459,000,000.0 |
Additions to property, plant, equipment | 111,600,000 | 130,200,000 | 586,400,000 | 511,300,000 |
Total assets at quarter-end | 6,848,100,000 | 7,088,300,000 | 6,848,100,000 | 7,088,300,000 |
Operating Segments | Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | 500,000 | 300,000 | 1,300,000 | 1,200,000 |
Revenues from external customers | 108,000,000.0 | 157,900,000 | 402,000,000.0 | 413,800,000 |
Lease operating expenses |  |  |  |  |
Lease operating expenses and taxes other than income | 41,200,000 | 51,700,000 | 133,100,000 | 142,100,000 |
Repair and maintenance | 1,400,000 | 1,800,000 | 4,000,000.0 | 3,200,000 |
Workovers | 100,000 | 300,000 | 900,000 | 2,800,000 |
Total lease operating expenses | 42,700,000 | 53,800,000 | 138,000,000.0 | 148,100,000 |
Severance and ad valorem taxes | 400,000 | 300,000 | 1,100,000 | 1,100,000 |
Transportation, gathering and processing | 24,800,000 | 21,200,000 | 68,700,000 | 60,400,000 |
Costs of purchased natural gas |  |  |  | 3,100,000 |
Selling and general expenses | 5,400,000 | 4,700,000 | 17,100,000 | 14,200,000 |
Exploration Expenses |  |  |  |  |
Geological and geophysical | 100,000 | 100,000 | 100,000 | 200,000 |
Dry holes and previously suspended exploration costs | 0 | 0 | 0 | 0 |
Other exploratory costs, including undeveloped lease amortization and delay lease rentals | 100,000 | 200,000 | 200,000 | 200,000 |
Total exploration expenses | 200,000 | 300,000 | 300,000 | 400,000 |
Depreciation, depletion and amortization | 39,300,000 | 42,800,000 | 109,800,000 | 114,100,000 |
Impairment of assets |  | 0 | 0 | 0 |
Accretion of asset retirement obligations | 2,600,000 | 2,100,000 | 7,700,000 | 6,400,000 |
Other operating expenses | 100,000 | 100,000 | 1,800,000 | 2,100,000 |
Interest Income | 0 | 0 | 0 | 0 |
Interest expense, net of capitalization | 100,000 | 0 | 100,000 | 200,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | (1,700,000) | 8,200,000 | 12,300,000 | 10,500,000 |
Deferred income tax expense (benefit) | (200,000) | 200,000 | (1,800,000) | 700,000 |
Total income tax expense (benefit) | (1,900,000) | 8,400,000 | 10,500,000 | 11,200,000 |
Other segment costs (income) | 400,000 | 0 | 1,100,000 | 0 |
Net income (loss) including noncontrolling interest | (6,100,000) | 24,200,000 | 45,800,000 | 52,500,000 |
Additions to property, plant, equipment | 26,000,000.0 | 13,500,000 | 127,000,000.0 | 122,900,000 |
Total assets at quarter-end | 1,981,800,000 | 2,043,000,000 | 1,981,800,000 | 2,043,000,000 |
Operating Segments | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | 0 | 0 | 0 | 0 |
Revenues from external customers | 100,000 | (800,000) | 3,000,000.0 | 3,400,000 |
Lease operating expenses |  |  |  |  |
Lease operating expenses and taxes other than income | 400,000 | 300,000 | 1,600,000 | 1,000,000.0 |
Repair and maintenance | 0 | 0 | 0 | 0 |
Workovers | 0 | 0 | 0 | 0 |
Total lease operating expenses | 400,000 | 300,000 | 1,600,000 | 1,000,000.0 |
Severance and ad valorem taxes | 0 | 0 | 0 | 0 |
Transportation, gathering and processing | 0 | 0 | 0 | 0 |
Costs of purchased natural gas |  |  |  | 0 |
Selling and general expenses | 2,200,000 | 1,900,000 | 6,700,000 | 4,900,000 |
Exploration Expenses |  |  |  |  |
Geological and geophysical | 1,100,000 | 2,800,000 | 1,600,000 | 8,600,000 |
Dry holes and previously suspended exploration costs | 900,000 | 400,000 | 1,000,000.0 | 1,700,000 |
Other exploratory costs, including undeveloped lease amortization and delay lease rentals | 7,800,000 | 4,700,000 | 22,600,000 | 16,700,000 |
Total exploration expenses | 9,800,000 | 7,900,000 | 25,200,000 | 27,000,000.0 |
Depreciation, depletion and amortization | 0 | 0 | 1,200,000 | 900,000 |
Impairment of assets |  | 0 | 0 | 0 |
Accretion of asset retirement obligations | 200,000 | 200,000 | 600,000 | 600,000 |
Other operating expenses | 200,000 | 500,000 | (1,100,000) | 600,000 |
Interest Income | 0 | 0 | 0 | 0 |
Interest expense, net of capitalization | 0 | 0 | 100,000 | 100,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | 0 | (100,000) | 200,000 | 200,000 |
Deferred income tax expense (benefit) | (400,000) | (34,000,000.0) | (1,100,000) | (33,700,000) |
Total income tax expense (benefit) | (400,000) | (34,100,000) | (900,000) | (33,500,000) |
Other segment costs (income) | (300,000) | 100,000 | 0 | 300,000 |
Net income (loss) including noncontrolling interest | (12,000,000.0) | 22,400,000 | (30,400,000) | 1,500,000 |
Additions to property, plant, equipment | 41,100,000 | 20,500,000 | 94,400,000 | 44,600,000 |
Total assets at quarter-end | 411,800,000 | 266,600,000 | 411,800,000 | 266,600,000 |
Operating Segments | Revenue from production |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | 721,000,000.0 | 753,100,000 | 2,076,800,000 | 2,345,300,000 |
Operating Segments | Revenue from production | United States |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | 613,400,000 | 596,500,000 | 1,673,100,000 | 1,933,000,000 |
Operating Segments | Revenue from production | Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | 107,500,000 | 157,600,000 | 400,700,000 | 408,900,000 |
Operating Segments | Revenue from production | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | 100,000 | (800,000) | 3,000,000.0 | 3,400,000 |
Operating Segments | Sales of purchased natural gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | 3,700,000 |
Operating Segments | Sales of purchased natural gas | United States |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | 0 |
Operating Segments | Sales of purchased natural gas | Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | 3,700,000 |
Operating Segments | Sales of purchased natural gas | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | 0 |
Corporate, Other, and Discontinued Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain on sales of assets and other operating income | 11,400,000 | 4,200,000 | 15,000,000.0 | 4,200,000 |
Revenues from external customers | 11,400,000 | 4,200,000 | 15,000,000.0 | 4,200,000 |
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 |
Costs of purchased natural gas |  |  |  | 0 |
Selling and general expenses | 21,400,000 | 20,000,000.0 | 66,200,000 | 65,000,000.0 |
Exploration Expenses |  |  |  |  |
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 | 2,100,000 | 1,500,000 | 6,200,000 | 7,000,000.0 |
Impairment of assets |  | 0 | 0 | 0 |
Accretion of asset retirement obligations | 100,000 | 0 | 100,000 | 100,000 |
Other operating expenses | (100,000) | 100,000 | 3,000,000.0 | (200,000) |
Interest Income | (2,700,000) | (3,100,000) | (8,700,000) | (8,600,000) |
Interest expense, net of capitalization | 24,600,000 | 21,000,000.0 | 73,100,000 | 61,700,000 |
Income tax expense |  |  |  |  |
Current income tax expense (benefit) | 2,800,000 | 2,100,000 | (100,000) | 6,200,000 |
Deferred income tax expense (benefit) | (5,200,000) | (9,500,000) | (25,400,000) | (28,800,000) |
Total income tax expense (benefit) | (2,400,000) | (7,400,000) | (25,500,000) | (22,600,000) |
Other segment costs (income) | (12,500,000) | 6,400,000 | 23,100,000 | (7,200,000) |
Net income (loss) including noncontrolling interest | (19,100,000) | (34,300,000) | (122,500,000) | (91,000,000.0) |
Additions to property, plant, equipment | 2,300,000 | 8,000,000.0 | 9,200,000 | 16,400,000 |
Total assets at quarter-end | 491,100,000 | 318,500,000 | 491,100,000 | 318,500,000 |
Corporate, Other, and Discontinued Operations | Revenue from production |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production | $ 0 | $ 0 | $ 0 | 0 |
Corporate, Other, and Discontinued Operations | Sales of purchased natural gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from production |  |  |  | $ 0 |

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