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Business Segment Information - Schedule of Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | $ 310,959 |  |  | $ 407,794 |  |  | $ 993,729 | $ 1,277,797 |
Gain on sale of assets |  |  |  |  |  |  | 600 |  |
Other income, net | 270 |  |  | 37 |  |  | 849 | 109 |
Total revenues and other income | 311,229 |  |  | 407,831 |  |  | 995,178 | 1,277,906 |
Oil and gas production | 147,696 |  |  | 133,471 |  |  | 558,122 | 377,822 |
Exploration expenses | 54,948 |  |  | 14,697 |  |  | 68,686 | 39,992 |
General and administrative | 12,886 |  |  | 23,298 |  |  | 58,215 | 76,724 |
Depletion, depreciation and amortization | 141,514 |  |  | 120,728 |  |  | 413,449 | 311,750 |
Interest and other financing costs, net | 57,919 |  |  | 22,112 |  |  | 164,595 | 75,839 |
Derivatives, net | (3,646) |  |  | (15,254) |  |  | (18,480) | 5,716 |
Other expenses, net | 6,384 |  |  | 2,227 |  |  | 14,854 | 6,418 |
Total costs and expenses | 417,701 |  |  | 301,279 |  |  | 1,259,441 | 894,261 |
Income (loss) before income taxes | (106,472) |  |  | 106,552 |  |  | (264,263) | 383,645 |
Income tax expense (benefit) | 17,827 |  |  | 61,578 |  |  | 58,382 | 187,215 |
Net income (loss) | (124,299) | $ (87,740) | $ (110,606) | 44,974 | $ 59,770 | $ 91,686 | (322,645) | 196,430 |
Consolidated capital expenditures, net | 67,336 |  |  | 210,008 |  |  | 239,631 | 711,652 |
Property and equipment, net | 4,208,535 |  |  | 4,694,435 |  |  | 4,208,535 | 4,694,435 | $ 4,444,221
Total assets | 5,089,741 |  |  | 5,470,946 |  |  | 5,089,741 | 5,470,946 | $ 5,308,988
Operating Segments | Ghana |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 141,146 |  |  | 233,348 |  |  | 497,104 | 821,880 |
Gain on sale of assets |  |  |  |  |  |  | 0 |  |
Other income, net | 269 |  |  | 0 |  |  | 768 | 1 |
Total revenues and other income | 141,415 |  |  | 233,348 |  |  | 497,872 | 821,881 |
Oil and gas production | 22,871 |  |  | 26,955 |  |  | 159,539 | 123,250 |
Exploration expenses | 0 |  |  | 1,413 |  |  | 70 | 3,665 |
General and administrative | 2,771 |  |  | 3,004 |  |  | 8,959 | 9,882 |
Depletion, depreciation and amortization | 43,180 |  |  | 47,919 |  |  | 131,620 | 144,609 |
Interest and other financing costs, net | 13,723 |  |  | 13,408 |  |  | 38,107 | 39,204 |
Derivatives, net | 0 |  |  | 0 |  |  | 0 | 0 |
Other expenses, net | (2,135) |  |  | (15,166) |  |  | (8,022) | 5,817 |
Total costs and expenses | 80,410 |  |  | 77,533 |  |  | 330,273 | 326,427 |
Income (loss) before income taxes | 61,005 |  |  | 155,815 |  |  | 167,599 | 495,454 |
Income tax expense (benefit) | 22,103 |  |  | 55,350 |  |  | 60,772 | 170,060 |
Net income (loss) | 38,902 |  |  | 100,465 |  |  | 106,827 | 325,394 |
Consolidated capital expenditures, net | 23,561 |  |  | 16,583 |  |  | 80,257 | 128,247 |
Property and equipment, net | 946,479 |  |  | 1,031,498 |  |  | 946,479 | 1,031,498 |
Total assets | 3,341,717 |  |  | 3,514,342 |  |  | 3,341,717 | 3,514,342 |
Operating Segments | Equatorial Guinea |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 41,777 |  |  | 70,970 |  |  | 140,774 | 188,917 |
Gain on sale of assets |  |  |  |  |  |  | 0 |  |
Other income, net | 0 |  |  | 0 |  |  | 0 | 0 |
Total revenues and other income | 41,777 |  |  | 70,970 |  |  | 140,774 | 188,917 |
Oil and gas production | 33,700 |  |  | 37,237 |  |  | 90,635 | 97,942 |
Exploration expenses | (211) |  |  | 1,881 |  |  | 1,258 | 5,263 |
General and administrative | 816 |  |  | 1,282 |  |  | 3,787 | 4,027 |
Depletion, depreciation and amortization | 19,658 |  |  | 15,003 |  |  | 62,226 | 38,895 |
Interest and other financing costs, net | (38) |  |  | (810) |  |  | (167) | (2,406) |
Derivatives, net | 0 |  |  | 0 |  |  | 0 | 0 |
Other expenses, net | 6,132 |  |  | 157 |  |  | 815 | (2,197) |
Total costs and expenses | 60,057 |  |  | 54,750 |  |  | 158,554 | 141,524 |
Income (loss) before income taxes | (18,280) |  |  | 16,220 |  |  | (17,780) | 47,393 |
Income tax expense (benefit) | (3,933) |  |  | 6,455 |  |  | (3,042) | 19,019 |
Net income (loss) | (14,347) |  |  | 9,765 |  |  | (14,738) | 28,374 |
Consolidated capital expenditures, net | 6,099 |  |  | 51,056 |  |  | 8,657 | 129,296 |
Property and equipment, net | 435,986 |  |  | 523,312 |  |  | 435,986 | 523,312 |
Total assets | 2,477,126 |  |  | 2,310,092 |  |  | 2,477,126 | 2,310,092 |
Operating Segments | Mauritania/Senegal |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 39,343 |  |  | 0 |  |  | 62,279 | 0 |
Gain on sale of assets |  |  |  |  |  |  | 0 |  |
Other income, net | 0 |  |  | 0 |  |  | 0 | 0 |
Total revenues and other income | 39,343 |  |  | 0 |  |  | 62,279 | 0 |
Oil and gas production | 59,401 |  |  | 39,685 |  |  | 186,643 | 57,851 |
Exploration expenses | 1,944 |  |  | 4,633 |  |  | 5,681 | 13,880 |
General and administrative | 1,930 |  |  | 3,301 |  |  | 7,033 | 8,567 |
Depletion, depreciation and amortization | 21,728 |  |  | 233 |  |  | 37,322 | 684 |
Interest and other financing costs, net | 5,814 |  |  | (37,043) |  |  | 10,216 | (107,808) |
Derivatives, net | 0 |  |  | 0 |  |  | 0 | 0 |
Other expenses, net | 421 |  |  | 881 |  |  | 1,569 | 6,111 |
Total costs and expenses | 91,238 |  |  | 11,690 |  |  | 248,464 | (20,715) |
Income (loss) before income taxes | (51,895) |  |  | (11,690) |  |  | (186,185) | 20,715 |
Income tax expense (benefit) | 0 |  |  | 0 |  |  | 0 | 0 |
Net income (loss) | (51,895) |  |  | (11,690) |  |  | (186,185) | 20,715 |
Consolidated capital expenditures, net | 6,761 |  |  | 75,997 |  |  | 68,879 | 287,193 |
Property and equipment, net | 2,092,629 |  |  | 2,177,621 |  |  | 2,092,629 | 2,177,621 |
Total assets | 3,405,756 |  |  | 3,209,803 |  |  | 3,405,756 | 3,209,803 |
Operating Segments | Gulf of America |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 88,693 |  |  | 103,476 |  |  | 293,572 | 267,000 |
Gain on sale of assets |  |  |  |  |  |  | 600 |  |
Other income, net | 19 |  |  | 543 |  |  | 728 | 2,028 |
Total revenues and other income | 88,712 |  |  | 104,019 |  |  | 294,900 | 269,028 |
Oil and gas production | 31,724 |  |  | 29,594 |  |  | 121,305 | 98,779 |
Exploration expenses | 53,134 |  |  | 5,380 |  |  | 60,279 | 13,392 |
General and administrative | 1,480 |  |  | 3,725 |  |  | 9,933 | 15,097 |
Depletion, depreciation and amortization | 56,812 |  |  | 56,496 |  |  | 181,851 | 125,765 |
Interest and other financing costs, net | (2,187) |  |  | (2,309) |  |  | (6,348) | (10,702) |
Derivatives, net | 0 |  |  | 0 |  |  | 0 | 0 |
Other expenses, net | (1,821) |  |  | 1,040 |  |  | 1,442 | 2,358 |
Total costs and expenses | 139,142 |  |  | 93,926 |  |  | 368,462 | 244,689 |
Income (loss) before income taxes | (50,430) |  |  | 10,093 |  |  | (73,562) | 24,339 |
Income tax expense (benefit) | 0 |  |  | 564 |  |  | (14) | 644 |
Net income (loss) | (50,430) |  |  | 9,529 |  |  | (73,548) | 23,695 |
Consolidated capital expenditures, net | 30,026 |  |  | 63,820 |  |  | 79,539 | 161,555 |
Property and equipment, net | 716,712 |  |  | 945,138 |  |  | 716,712 | 945,138 |
Total assets | 2,714,156 |  |  | 4,074,383 |  |  | 2,714,156 | 4,074,383 |
Corporate & Other |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 0 |  |  | 0 |  |  | 0 | 0 |
Gain on sale of assets |  |  |  |  |  |  | 0 |  |
Other income, net | 8,683 |  |  | 23,160 |  |  | 69,352 | 123,674 |
Total revenues and other income | 8,683 |  |  | 23,160 |  |  | 69,352 | 123,674 |
Oil and gas production | 0 |  |  | 0 |  |  | 0 | 0 |
Exploration expenses | 81 |  |  | 1,390 |  |  | 1,398 | 3,792 |
General and administrative | 18,237 |  |  | 50,905 |  |  | 116,983 | 159,028 |
Depletion, depreciation and amortization | 136 |  |  | 1,077 |  |  | 430 | 1,797 |
Interest and other financing costs, net | 40,607 |  |  | 48,866 |  |  | 122,787 | 157,551 |
Derivatives, net | (3,646) |  |  | (15,254) |  |  | (18,480) | 5,716 |
Other expenses, net | 141 |  |  | 62 |  |  | 570 | 45 |
Total costs and expenses | 55,556 |  |  | 87,046 |  |  | 223,688 | 327,929 |
Income (loss) before income taxes | (46,873) |  |  | (63,886) |  |  | (154,336) | (204,255) |
Income tax expense (benefit) | (343) |  |  | (791) |  |  | 666 | (2,508) |
Net income (loss) | (46,530) |  |  | (63,095) |  |  | (155,002) | (201,747) |
Consolidated capital expenditures, net | 889 |  |  | 2,552 |  |  | 2,299 | 5,360 |
Property and equipment, net | 16,729 |  |  | 16,866 |  |  | 16,729 | 16,866 |
Total assets | 26,831,583 |  |  | 25,174,519 |  |  | 26,831,583 | 25,174,519 |
Eliminations |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Oil and gas revenue | 0 |  |  | 0 |  |  | 0 | 0 |
Gain on sale of assets |  |  |  |  |  |  | 0 |  |
Other income, net | (8,701) |  |  | (23,666) |  |  | (69,999) | (125,594) |
Total revenues and other income | (8,701) |  |  | (23,666) |  |  | (69,999) | (125,594) |
Oil and gas production | 0 |  |  | 0 |  |  | 0 | 0 |
Exploration expenses | 0 |  |  | 0 |  |  | 0 | 0 |
General and administrative | (12,348) |  |  | (38,919) |  |  | (88,480) | (119,877) |
Depletion, depreciation and amortization | 0 |  |  | 0 |  |  | 0 | 0 |
Interest and other financing costs, net | 0 |  |  | 0 |  |  | 0 | 0 |
Derivatives, net | 0 |  |  | 0 |  |  | 0 | 0 |
Other expenses, net | 3,646 |  |  | 15,253 |  |  | 18,480 | (5,716) |
Total costs and expenses | (8,702) |  |  | (23,666) |  |  | (70,000) | (125,593) |
Income (loss) before income taxes | 1 |  |  | 0 |  |  | 1 | (1) |
Income tax expense (benefit) | 0 |  |  | 0 |  |  | 0 | 0 |
Net income (loss) | 1 |  |  | 0 |  |  | 1 | (1) |
Consolidated capital expenditures, net | 0 |  |  | 0 |  |  | 0 | 0 |
Property and equipment, net | 0 |  |  | 0 |  |  | 0 | 0 |
Total assets | $ (33,680,597) |  |  | $ (32,812,193) |  |  | $ (33,680,597) | $ (32,812,193) |

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