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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)