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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
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, 2025 and December 31, 2024, for each fair value hierarchy level: 
 Fair Value Measurements Using:
 Quoted Prices in   
 Active Markets forSignificant OtherSignificant 
 Identical AssetsObservable InputsUnobservable Inputs 
 (Level 1)(Level 2)(Level 3)Total
 (In thousands)
September 30, 2025    
Assets:    
Commodity derivatives $— $21,884 $— $21,884 
Provisional oil sales— 999 — 999 
Interest rate derivatives— 178 — 178 
Decommissioning trust fund:
Debt securities— 23,478 — 23,478 
Liabilities:
Commodity derivatives — (3,517)— (3,517)
Total $— $43,022 $— $43,022 
December 31, 2024
Assets:
Commodity derivatives $— $7,226 $— $7,226 
Provisional oil sales— 2,242 — 2,242 
Interest rate derivatives— 2,202 — 2,202 
Decommissioning trust fund:
Debt securities— 10,653 — 10,653 
Total $— $22,323 $— $22,323 
Schedule of Costs and Fair Values of Investments in Debt Securities in Decommissioning Trust Fund
The following table summarizes Kosmos’ portion of the investment activity in debt securities held by the decommissioning trust during the three and nine months ended September 30, 2025 and 2024:
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)
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 
2024
Debt securities
$— $— $— $— $— $— 
Cash and cash equivalents
— — — — — — 
Other(1)
— — — — — — 
Total
$— $— $— $— $— $— 

(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, 2025 and December 31, 2024:

September 30, 2025December 31, 2024
Cost
Estimated Fair Value
Cost
Estimated Fair Value
(In thousands)
Less than 5 years
$23,359 $23,478 $10,708 $10,653 
5 years to 10 years
— — — — 
Due after 10 years
— — — — 
Total
$23,359 $23,478 $10,708 $10,653 
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, 2025 and December 31, 2024:
 
 September 30, 2025December 31, 2024
 Carrying ValueFair ValueCarrying ValueFair Value
 (In thousands)
7.125% Senior Notes
$249,716 $249,448 $249,315 $246,565 
7.750% Senior Notes
348,540 341,022 347,910 339,927 
7.500% Senior Notes
398,232 352,978 397,672 379,404 
8.750% Senior Notes
495,418 386,875 494,997 470,965 
3.125% Convertible Senior Notes
392,718 254,000 391,603 332,792 
Facility1,125,000 1,125,000 900,000 900,000 
Total$3,009,624 $2,709,323 $2,781,497 $2,669,653