CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income (loss)	$ (78,909)us-gaap_NetIncomeLoss	$ 74,969us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depletion, depreciation and amortization	39,617	49,164
Deferred income taxes	5,783us-gaap_DeferredIncomeTaxExpenseBenefit	30,267us-gaap_DeferredIncomeTaxExpenseBenefit
Unsuccessful well costs	83,627us-gaap_ResultsOfOperationsDryHoleCosts	(245)us-gaap_ResultsOfOperationsDryHoleCosts
Change in fair value of derivatives	(34,980)us-gaap_UnrealizedGainLossOnDerivatives	(810)us-gaap_UnrealizedGainLossOnDerivatives
Cash settlements on derivatives	53,932kos_CashSettlementsOnDerivatives	(1,555)kos_CashSettlementsOnDerivatives
Equity-based compensation	25,183us-gaap_ShareBasedCompensation	17,900us-gaap_ShareBasedCompensation
Gain on sale of assets	(22,751)us-gaap_GainLossOnSaleOfProperty	(23,769)us-gaap_GainLossOnSaleOfProperty
Loss on extinguishment of debt		2,898
Other	1,171us-gaap_OtherNoncashIncomeExpense	(4,220)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:
(Increase) decrease in receivables	35,926us-gaap_IncreaseDecreaseInReceivables	(63,566)us-gaap_IncreaseDecreaseInReceivables
(Increase) decrease in inventories	(18,443)us-gaap_IncreaseDecreaseInInventories	4,872us-gaap_IncreaseDecreaseInInventories
Increase in prepaid expenses and other	(4,399)	(10,484)
Increase (decrease) in accounts payable	(58,286)	9,391
Increase (decrease) in accrued liabilities	(36,451)	28,774
Net cash provided by (used in) operating activities	(8,980)	113,586
Investing activities
Oil and gas assets	(184,899)	(96,486)
Other property	(280)	(428)
Proceeds on sale of assets		34,581
Restricted cash	(59)	(2,410)
Net cash used in investing activities	(185,238)	(64,743)
Financing activities
Payments on long-term debt		(100,000)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury stock	(148)	(71)
Deferred financing costs		(18,852)us-gaap_PaymentsOfFinancingCosts
Net cash used in financing activities	(148)	(118,923)
Net decrease in cash and cash equivalents	(194,366)	(70,080)
Cash and cash equivalents at beginning of period	554,831	598,108
Cash and cash equivalents at end of period	360,465	528,028
Cash paid for:
Interest	32,179us-gaap_InterestPaid	7,280us-gaap_InterestPaid
Income taxes	$ 10,000us-gaap_IncomeTaxesPaid	$ 20,431us-gaap_IncomeTaxesPaid

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Dry hole costs from oil and gas producing activities.

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-Name Accounting Standards Codification

-Topic 932

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-Section 25

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

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