Fair Value Measurements (Tables)
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9 Months Ended |
Sep. 30, 2026 |
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| Fair Value Disclosures [Abstract] |
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| Schedule of Company's Assets and Liabilities that are Measured at Fair Value on a Recurring Basis |
The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2026 and December 31, 2025, for each fair value hierarchy level: | | | | | | | | | | | | | | | | | | | | | | | | | Fair Value Measurements Using: | | Quoted Prices in | | | | | | | | Active Markets for | | Significant Other | | Significant | | | | Identical Assets | | Observable Inputs | | Unobservable Inputs | | | | (Level 1) | | (Level 2) | | (Level 3) | | Total | | (In thousands) | | September 30, 2026 | | | | | | | | | Assets: | | | | | | | | | Commodity derivatives | $ | — | | | $ | 18 | | | $ | — | | | $ | 18 | | Provisional sales contracts | — | | | — | | | — | | | — | | | | | | | | | | | Debt securities held in decommissioning trust fund | — | | | 35,930 | | | — | | | 35,930 | | | Liabilities: | | | | | | | | | Commodity derivatives | — | | | (108,072) | | | — | | | (108,072) | | | | | | | | | | | | | | | | | | | Total | $ | — | | | $ | (72,124) | | | $ | — | | | $ | (72,124) | | | December 31, 2025 | | | | | | | | | Assets: | | | | | | | | | Commodity derivatives | $ | — | | | $ | 50,497 | | | $ | — | | | $ | 50,497 | | | | | | | | | | | | | | | | | | | Debt securities held in decommissioning trust fund | — | | | 23,707 | | | — | | | 23,707 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total | $ | — | | | $ | 74,204 | | | $ | — | | | $ | 74,204 | |
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| Schedule of Costs and Fair Values of Investments in Debt Securities in Decommissioning Trust Fund |
The following table summarizes the purchases, proceeds from the sale and maturities, and the unrealized gains (losses) for Kosmos’ portion of the investments in debt securities held by the decommissioning trust during the three and nine months ended September 30, 2026 and 2025:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | Type of Security | | Purchases | | Net Proceeds (1) | | Unrealized Gain (Loss) | | Purchases | | Net Proceeds (1) | | Unrealized Gain (Loss) | | | (In thousands) | | | | | | | | 2026 | | | | | | | Debt securities | | $ | 448 | | | $ | — | | | $ | (170) | | | $ | 12,499 | | | $ | — | | | $ | (276) | | | Cash and cash equivalents | | — | | | — | | | — | | | — | | | 1 | | | — | | | Other(1) | | — | | | 118 | | | — | | | — | | | 63 | | | — | | | Total | | $ | 448 | | | $ | 118 | | | $ | (170) | | | $ | 12,499 | | | $ | 64 | | | $ | (276) | | | 2025 | | | | | | | | | | | | | | Debt securities | | $ | 245 | | | $ | — | | | $ | 43 | | | $ | 12,651 | | | $ | — | | | $ | 174 | | | Cash and cash equivalents | | — | | | (3) | | | — | | | — | | | (748) | | | — | | | Other(1) | | — | | | (17) | | | — | | | — | | | 149 | | | — | | | Total | | $ | 245 | | | $ | (20) | | | $ | 43 | | | $ | 12,651 | | | $ | (599) | | | $ | 174 | |
(1) Represents net receivables relating to interest. The following table presents the costs and fair values of investments in debt securities held in the decommissioning trust fund according to the contractual maturities at September 30, 2026 and December 31, 2025:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | December 31, 2025 | | | Cost | | Estimated Fair Value | | Cost | | Estimated Fair Value | | | (In thousands) | Less than 5 years | | $ | 36,064 | | | $ | 35,930 | | | $ | 23,565 | | | $ | 23,707 | | 5 years to 10 years | | — | | | — | | | — | | | — | | Due after 10 years | | — | | | — | | | — | | | — | | Total | | $ | 36,064 | | | $ | 35,930 | | | $ | 23,565 | | | $ | 23,707 | |
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| Schedule of Carrying Values and Fair Values of Financial Instruments that are not Carried at Fair Value |
The following table presents the carrying values and fair values at September 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2026 | | December 31, 2025 | | Carrying Value | | Fair Value | | Carrying Value | | Fair Value | | (In thousands) | 7.125% Senior Notes | $ | — | | | $ | — | | | $ | 99,942 | | | $ | 99,303 | | 7.750% Senior Notes | 49,893 | | | 50,102 | | | 348,757 | | | 321,394 | | 7.500% Senior Notes | 399,031 | | | 398,289 | | | 398,426 | | | 270,125 | | 8.750% Senior Notes | 496,022 | | | 458,340 | | | 495,564 | | | 283,575 | | 3.125% Convertible Senior Notes | 394,252 | | | 331,000 | | | 393,097 | | | 172,704 | | 11.250% Senior Secured Bonds | 350,000 | | | 376,131 | | | — | | | — | | | GoA Term Loan Facility | 181,319 | | | 181,319 | | | 150,000 | | | 150,000 | | | Facility | 750,000 | | | 750,000 | | | 1,200,000 | | | 1,200,000 | | | Total | $ | 2,620,517 | | | $ | 2,545,181 | | | $ | 3,085,786 | | | $ | 2,497,101 | |
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