XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.26.1

Additional Financial Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2026
Additional Financial Information [Abstract] |
Schedule of Accrued Liabilities | Accrued liabilities consisted of the following:
| June 30, 2026 |  | December 31, 2025
| (In thousands)
Accrued liabilities: |  |  |
Exploration, development and production | $ | 43,793 |  |  | $ | 57,007 |
Revenue payable | 18,862 |  |  | 69,273 |
Current asset retirement obligations | 9,767 |  |  | 10,481 |
Finance lease liability | 73,203 |  |  | — |
General and administrative expenses | 23,460 |  |  | 4,916 |
Interest | 91,427 |  |  | 67,830 |
Income taxes | 51,596 |  |  | 16,050 |
Taxes other than income | 2,209 |  |  | 1,305 |
Derivatives | 14,921 |  |  | 125 |
Other | 14,641 |  |  | 10,622 |
Total | $ | 343,879 |  |  | $ | 237,609 |
Schedule of Changes in Asset Retirement Obligations | The following table summarizes the changes in the Company's asset retirement obligations as of and during the six months ended June 30, 2026:
| June 30, 2026
| (In thousands)
Asset retirement obligations: |
Beginning asset retirement obligations | $ | 337,497 |
Liabilities incurred during period | 3,051 |
Liabilities settled during period | (143,166) |
Revisions in estimated retirement obligations | 242 |
Accretion expense | 15,587 |
Ending asset retirement obligations | $ | 213,211 |

X
- Definition Additional Financial Information + References No definition available. + Details
Name: | kos_AdditionalFinancialInformationAbstract
Namespace Prefix: | kos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration