XML 69 R52.htm IDEA: XBRL DOCUMENT
v3.25.3

Derivative Financial Instruments - Schedule of Oil Derivative Contracts (Details) | 9 Months Ended
--- | ---
Sep. 30, 2025 $ / bbl MBbls
Dated Brent | Term October 2025 To December 2025 | Two-way collars |
Derivative Financial Instruments |
Volume | MBbls | 2,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 1.35
Swap (usd per bbl) | 0
Sold put (usd per bbl) | 0
Floor (usd per bbl) | 60.00
Ceiling (usd per bbl) | 74.94
Dated Brent | Term October 2025 To December 2025 | Three-way collars |
Derivative Financial Instruments |
Volume | MBbls | 500
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 1.13
Swap (usd per bbl) | 0
Sold put (usd per bbl) | 55.00
Floor (usd per bbl) | 70.00
Ceiling (usd per bbl) | 85.00
Dated Brent | Term January 2026 To June 2026 | Two-way collars |
Derivative Financial Instruments |
Volume | MBbls | 1,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 1.55
Swap (usd per bbl) | 0
Sold put (usd per bbl) | 0
Floor (usd per bbl) | 60.00
Ceiling (usd per bbl) | 74.75
Dated Brent | Term January 2026 To June 2026 | Swaps |
Derivative Financial Instruments |
Volume | MBbls | 1,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 0
Swap (usd per bbl) | 72.90
Sold put (usd per bbl) | 0
Floor (usd per bbl) | 0
Ceiling (usd per bbl) | 80.00
Dated Brent | Term January 2026 To December 2026 | Three-way collars |
Derivative Financial Instruments |
Volume | MBbls | 2,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 0
Swap (usd per bbl) | 0
Sold put (usd per bbl) | 50.00
Floor (usd per bbl) | 60.00
Ceiling (usd per bbl) | 75.51
Dated Brent | Term January 2026 To December 2026 1 | Swaps |
Derivative Financial Instruments |
Volume | MBbls | 1,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 0
Swap (usd per bbl) | 72.46
Sold put (usd per bbl) | 0
Floor (usd per bbl) | 0
Ceiling (usd per bbl) | 80.00
Dated Brent | Term January 2026 To December 2026 2 | Swaps |
Derivative Financial Instruments |
Volume | MBbls | 2,000
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 0
Swap (usd per bbl) | 69.70
Sold put (usd per bbl) | 55.00
Floor (usd per bbl) | 0
Ceiling (usd per bbl) | 0
NYMEX WTI | Term January 2026 To December 2026 | Swaps |
Derivative Financial Instruments |
Volume | MBbls | 1,500
Weighted Average Price per Bbl |
Net deferred premium payable/(receivable) (usd per bbl) | 0
Swap (usd per bbl) | 64.83
Sold put (usd per bbl) | 50.00
Floor (usd per bbl) | 0
Ceiling (usd per bbl) | 0

X
- Definition Derivative Sold Put Average Price Risk Option Strike Price + References No definition available. + Details
Name: | kos_DerivativeSoldPutAveragePriceRiskOptionStrikePrice
Namespace Prefix: | kos_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative Weighted Average Deferred Premium Per Barrel Net + References No definition available. + Details
Name: | kos_DerivativeWeightedAverageDeferredPremiumPerBarrelNet
Namespace Prefix: | kos_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Dated Brent Price Per Bbl [Abstract] + References No definition available. + Details
Name: | kos_WeightedAverageDatedBrentPriceperBblAbstract
Namespace Prefix: | kos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageCapPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | kos_DerivativeTradingIndexAxis=kos_DatedBrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeContractTermAxis=kos_TermOctober2025ToDecember2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=kos_TwoWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=kos_ThreeWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeContractTermAxis=kos_TermJanuary2026ToJune2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeContractTermAxis=kos_TermJanuary2026ToDecember2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeContractTermAxis=kos_TermJanuary2026ToDecember20261Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeContractTermAxis=kos_TermJanuary2026ToDecember20262Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kos_DerivativeTradingIndexAxis=kos_NYMEXWTIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |