$KOS
Kosmos Energy Ltd. Stock $kos

$kos Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000104746913001596 Filed on February 25, 2013

Income Statement

Concept	2011 Q4	2010
Revenue	$220.0M	$9.340M
YoY Change		-8.39%
Cost Of Revenue	$25.10M	$0.00
YoY Change		-100.0%
Gross Profit	$194.9M	$0.00
YoY Change		-100.0%
Gross Profit Margin	88.59%	0.0%
Selling, General & Admin	$41.40M	$138.7M
YoY Change	-52.9%	149.46%
% of Gross Profit	21.24%
Research & Development	$21.80M	$73.10M
YoY Change	6.86%
% of Gross Profit	11.19%
Depreciation & Amortization	$53.70M	$31.25M
YoY Change	490.11%	609.74%
% of Gross Profit	27.55%
Operating Expenses	$117.0M	$244.2M
YoY Change	-1.18%	306.32%
Operating Profit	$77.90M	-$244.2M
YoY Change	-165.79%	197.08%
Interest Expense	-$15.40M	$59.58M
YoY Change	-39.13%	779.57%
% of Operating Profit	-19.77%
Other Income/Expense, Net	$0.00	-$1.094M
YoY Change	-100.0%	2278.26%
Pretax Income	$62.50M	-$322.8M
YoY Change	-143.89%	309.75%
Income Tax	$28.20M	-$77.11M
% Of Pretax Income	45.12%
Net Earnings	$34.30M	-$323.0M
YoY Change	-152.45%	305.01%
Net Earnings / Revenue	15.59%	-3458.08%
Basic Earnings Per Share
Diluted Earnings Per Share	$92.93K	-$661.9K
COMMON SHARES
Basic Shares Outstanding	389.9M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2011 Q4	2010	2009 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$673.1M	$100.4M
YoY Change		-28.03%
Cash & Equivalents	$673.1M	$100.4M	$139.5M
Short-Term Investments
Other Short-Term Assets	$102.1M	$182.9M
YoY Change		20222.22%
Inventory	$27.10M	$37.70M
Prepaid Expenses
Receivables	$109.5M	$124.4M
Other Receivables	$981.0K	$114.6M
Total Short-Term Assets	$1.112B	$559.9M
YoY Change	98.69%	118.11%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.377B	$998.0M
YoY Change	37.98%	65.23%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments		$1.500M
YoY Change
Other Assets	$62.40M	$110.2M
YoY Change		-7.94%
Total Long-Term Assets	$1.439B	$1.132B
YoY Change	27.2%	47.84%
TOTAL ASSETS
Total Short-Term Assets	$1.112B	$559.9M
Total Long-Term Assets	$1.439B	$1.132B
Total Assets	$2.552B	$1.692B
YoY Change	50.86%	65.49%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$278.0M	$163.5M
YoY Change	70.04%	67.18%
Accrued Expenses	$37.19M	$52.80M
YoY Change	-30.1%	28.16%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$245.0M
YoY Change	-100.0%
Total Short-Term Liabilities	$339.6M	$482.1M
YoY Change	-29.55%	245.34%
LONG-TERM LIABILITIES
Long-Term Debt	$1.110B	$800.0M
YoY Change	38.75%	180.7%
Other Long-Term Liabilities	$4.896M	$32.90M
YoY Change	382.84%	2250.0%
Total Long-Term Liabilities	$1.192B	$832.9M
YoY Change	40.95%	190.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$339.6M	$482.1M
Total Long-Term Liabilities	$1.192B	$832.9M
Total Liabilities	$1.531B	$1.327B
YoY Change	15.35%	211.09%
SHAREHOLDERS EQUITY
Retained Earnings	-$616.1M
YoY Change	0.1%
Common Stock	$1.633B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$6.000K
YoY Change
Treasury Stock Shares	649.8K shares
Shareholders Equity	$1.021B	$364.1M	-$217.9M
YoY Change
Total Liabilities & Shareholders Equity	$2.552B	$1.692B
YoY Change	50.86%	65.49%

Cashflow Statement

Concept	2011 Q4	2010
OPERATING ACTIVITIES
Net Income	$34.30M	-$323.0M
YoY Change	-152.45%	305.01%
Depreciation, Depletion And Amortization	$53.70M	$31.25M
YoY Change	490.11%	609.74%
Cash From Operating Activities	$97.80M	-$191.8M
YoY Change	-266.89%	594.93%
INVESTING ACTIVITIES
Capital Expenditures	-$199.2M	-$446.2M
YoY Change	73.37%	6.67%
Acquisitions
YoY Change
Other Investing Activities	$8.100M	-$143.8M
YoY Change	-133.89%	75.15%
Cash From Investing Activities	-$191.1M	-$590.0M
YoY Change	37.68%	17.91%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	110.0M	742.7M
YoY Change	15.79%	42.91%
NET CHANGE
Cash From Operating Activities	97.80M	-191.8M
Cash From Investing Activities	-191.1M	-590.0M
Cash From Financing Activities	110.0M	742.7M
Net Change In Cash	16.70M	-39.10M
YoY Change	-116.31%	371.08%
FREE CASH FLOW
Cash From Operating Activities	$97.80M	-$191.8M
Capital Expenditures	-$199.2M	-$446.2M
Free Cash Flow	$297.0M	$254.4M
YoY Change	427.53%	-34.89%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q2	dei	Entity Public Float EntityPublicFloat	778343016	USD
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>1. Organization</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Kosmos Energy Ltd. was incorporated pursuant to the laws of Bermuda in January 2011 to become a holding company for Kosmos Energy Holdings. Kosmos Energy Holdings is a privately held Cayman Islands company that was formed in March 2004. As a holding company, Kosmos Energy Ltd.'s management operations are conducted through a wholly owned subsidiary, Kosmos Energy, LLC. The terms "Kosmos," the "Company," "we," "us," "our," "ours," and similar terms when used in the present tense or prospectively or for historical periods since May 16, 2011 refer to Kosmos Energy Ltd. and its wholly owned subsidiaries and for historical periods prior to May 16, 2011 refer to Kosmos Energy Holdings and its wholly owned subsidiaries, unless the context indicates otherwise.</font></p> <p style="FONT-FAMILY: times"><font size="2">        We are a leading independent oil and gas exploration and production company focused on frontier and emerging areas in Africa and South America. Our asset portfolio includes existing production and other major project developments offshore Ghana, as well as exploration licenses with significant hydrocarbon potential offshore Mauritania, Morocco and Suriname and onshore Cameroon.</font></p> <p style="FONT-FAMILY: times"><font size="2">        In May 2011, contemporaneous with Kosmos Energy Ltd.'s initial public offering ("IPO"), the Series A Convertible Preferred Units, Series B Convertible Preferred Units and Series C Convertible Preferred Units (collectively the "Convertible Preferred Units") and common units of Kosmos Energy Holdings were exchanged into common shares of Kosmos Energy Ltd. based on the pre-offering equity value of such interests in our corporate reorganization (the "corporate reorganization"). This resulted in the Convertible Preferred Units and the common units being exchanged into 277.7 million and 63.5 million common shares of Kosmos Energy Ltd., respectively, or 341.2 million common shares in the aggregate. The 341.2 million common shares included 10.0 million service vesting restricted stock awards issued to management and employees in exchange for unvested profit units in connection with our corporate reorganization. The common shares have one vote per share and a par value of $0.01. As a result of this corporate reorganization, Kosmos Energy Holdings became wholly owned by Kosmos Energy Ltd. Subsequent to this exchange, we have one class of common stock with issued and outstanding shares.</font></p> <p style="FONT-FAMILY: times"><font size="2">        Kosmos Energy Ltd. completed its IPO of 33.0 million common shares on May 16, 2011. In June 2011, the Company closed the sale of an additional 1.5 million common shares pursuant to the over-allotment option exercised by the underwriters of the IPO. This partial exercise of the over-allotment option brings the total number of common shares sold in the offering to 34.5 million. Our net proceeds from the sale of 34.5 million common shares, after underwriting discounts and commissions and offering expenses, were $580.4 million.</font></p> <p style="FONT-FAMILY: times"><font size="2">        We have one reportable segment, which is the exploration and production of oil and natural gas. Substantially all of our long-lived assets and product sales are related to production located offshore Ghana.</font></p></div>
CY2012	dei	Entity Registrant Name EntityRegistrantName	Kosmos Energy Ltd.
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	388593342	shares
CY2011Q4	us-gaap	Assets Current AssetsCurrent	1112481000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	15450000	USD
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001509991
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	41021000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	10470000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	515164000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	673092000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	21341000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	23747000	USD
CY2012Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	21539000	USD
CY2011Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	199699000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	108995000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	109475000	USD
CY2012Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	3682000	USD
CY2011Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	981000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	1510312000	USD
CY2011Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	1367265000	USD
CY2012Q4	us-gaap	Inventory Net InventoryNet	33281000	USD
CY2011Q4	us-gaap	Inventory Net InventoryNet	27101000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	13913000	USD
CY2012Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1061000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	750118000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	9776000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1525762000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1377041000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	29884000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	3800000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	50214000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	54847000	USD
CY2012Q4	us-gaap	Assets Assets	2366123000	USD
CY2011Q4	us-gaap	Assets Assets	2551934000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	128855000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	278006000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1108000	USD
CY2011	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	666912000	USD
CY2011	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	83551000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	6000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	37194000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2366123000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2551934000	USD
CY2012Q4	kos	Accumulated Amortization Of Deferred Finance Costs And Other Assets AccumulatedAmortizationOfDeferredFinanceCostsAndOtherAssets	13922000	USD
CY2011Q4	kos	Accumulated Amortization Of Deferred Finance Costs And Other Assets AccumulatedAmortizationOfDeferredFinanceCostsAndOtherAssets	6582000	USD
CY2012Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	20377000	USD
CY2011Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	24407000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	190253000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	339607000	USD
CY2012Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1000000000	USD
CY2011Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1110000000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	3226000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	8427000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	27484000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	20670000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	104137000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	47608000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	12117000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	4896000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1146964000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1191601000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	3914000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	3905000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1712880000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1629453000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-683176000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-616148000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	3685000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	3522000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	8397000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1028906000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1020726000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	390530946	shares
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	2731941	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	649818	shares
CY2012	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	667951000	USD
CY2011	kos	Cash Settlements On Derivatives CashSettlementsOnDerivatives	19203000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	9093000	USD
CY2010	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4231000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	3150000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	775000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	5109000	USD
CY2012	us-gaap	Revenues Revenues	672209000	USD
CY2011	us-gaap	Revenues Revenues	676780000	USD
CY2010	us-gaap	Revenues Revenues	9340000	USD
CY2012	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	95109000	USD
CY2012	us-gaap	Exploration Expense ExplorationExpense	97712000	USD
CY2011	us-gaap	Exploration Expense ExplorationExpense	126409000	USD
CY2010	us-gaap	Exploration Expense ExplorationExpense	73126000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	160027000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	113579000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	98967000	USD
CY2012	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	185707000	USD
CY2011	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	140469000	USD
CY2010	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	2423000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	8984000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	16193000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	28827000	USD
CY2012	us-gaap	Interest Expense InterestExpense	52207000	USD
CY2011	us-gaap	Interest Expense InterestExpense	65749000	USD
CY2010	us-gaap	Interest Expense InterestExpense	59582000	USD
CY2012	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	-31490000	USD
CY2011	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	-11777000	USD
CY2010	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	-28319000	USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5342000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-59643000	USD
CY2011	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	39782000	USD
CY2010	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	-39782000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1475000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-149000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1094000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	638053000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	577737000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	332120000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	34156000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	99043000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-322780000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	101184000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	76686000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-77108000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	-67028000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	22357000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	-245672000	USD
CY2010	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	77313000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-67028000	USD
	us-gaap	Net Income Loss NetIncomeLoss	36106000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	-322985000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.18
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	371847000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	371847000	shares
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	163000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	2934000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	5426000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	-1027000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	1027000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1190000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1907000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	588000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-39090000	USD
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24264000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-245084000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	31250000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-65838000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	194691000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	156662000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	65800000	USD
CY2012	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-1486000	USD
CY2011	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-7308000	USD
CY2010	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	11929000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	80036000	USD
CY2012	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	368990000	USD
CY2011	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	478943000	USD
CY2010	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	444712000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	371530000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	364909000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	56457000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-77614000	USD
CY2012	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	32229000	USD
CY2011	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	91254000	USD
CY2010	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	59401000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-18465000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-21014000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-34545000	USD
CY2012	kos	Cash Settlements On Derivatives CashSettlementsOnDerivatives	28594000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	83423000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	50966000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	13791000	USD
CY2012	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7890000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2953000	USD
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-721000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-176905000	USD
CY2011	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	122859000	USD
CY2010	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	100605000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	7385000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-4176000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	12699000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3443000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	635000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	12429000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-126401000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	89214000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	-191800000	USD
CY2012	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	9994000	USD
CY2011	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	4303000	USD
CY2010	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	1452000	USD
CY2011	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-13653000	USD
CY2010	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	61811000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	23678000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-84453000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	82000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-402662000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-385140000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-589975000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1503000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	760000000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	110000000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1438000000	USD
CY2011	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	580374000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	8378000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8418000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	52466000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-157928000	USD
CY2012Q4	us-gaap	Capitalized Costs Support Equipment And Facilities CapitalizedCostsSupportEquipmentAndFacilities	687835000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	17315000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-126796000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	592908000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	742685000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	572677000	USD
CY2012	us-gaap	Interest Paid InterestPaid	41234000	USD
CY2011	us-gaap	Interest Paid InterestPaid	56845000	USD
CY2010	us-gaap	Interest Paid InterestPaid	52472000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	22020000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	15550000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	762000	USD
CY2011	kos	Notes Receivable Applied NotesReceivableApplied	-102783000	USD
CY2010	kos	Deemed Payment And Termination Of Notes Receivable DeemedPaymentAndTerminationOfNotesReceivable	90197000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	100415000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139505000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	-217856000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	-614411000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13791000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	588000	USD
CY2010	kos	Accrete Of Preferred Units To Redemption AccreteOfPreferredUnitsToRedemption	153506000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	83423000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	163000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	8378000	USD
CY2011	kos	Accrete Of Preferred Units To Redemption AccreteOfPreferredUnitsToRedemption	24442000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	580374000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	50966000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	2934000	USD
CY2012Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	33100000	USD
CY2011Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	26900000	USD
CY2012Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	200000	USD
CY2011Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	200000	USD
CY2012Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	682276000	USD
CY2011Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	607338000	USD
CY2012Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	454391000	USD
CY2011Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	294701000	USD
CY2011Q4	us-gaap	Capitalized Costs Support Equipment And Facilities CapitalizedCostsSupportEquipmentAndFacilities	600848000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	1824502000	USD
CY2011Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	1502887000	USD
CY2012	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	178600000	USD
CY2011	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	135500000	USD
CY2012	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	29600000	USD
CY2011	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	51400000	USD
CY2010	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	56000000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	372492000	USD
CY2011Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	267592000	USD
CY2010Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	167511000	USD
CY2009Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	114307000	USD
CY2012	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	107527000	USD
CY2011	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	139949000	USD
CY2012	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	2627000	USD
CY2011	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	39868000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	106635000	USD
CY2011Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	132838000	USD
CY2010Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	49022000	USD
CY2012Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	265857000	USD
CY2011Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	134754000	USD
CY2010Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	118489000	USD
CY2012Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	7	Project
CY2011Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	3	Project
CY2010Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	3	Project
CY2012Q4	kos	Accrued Exploration Development And Production Costs Current AccruedExplorationDevelopmentAndProductionCostsCurrent	20616000	USD
CY2012Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	4192000	USD
CY2010	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-35286000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	59407000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	88603000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	130767000	USD
CY2011Q4	kos	Accrued Exploration Development And Production Costs Current AccruedExplorationDevelopmentAndProductionCostsCurrent	27666000	USD
CY2012Q4	kos	Accrued General And Administrative Expenses Current AccruedGeneralAndAdministrativeExpensesCurrent	5089000	USD
CY2011Q4	kos	Accrued General And Administrative Expenses Current AccruedGeneralAndAdministrativeExpensesCurrent	2159000	USD
CY2012Q4	kos	Accrual For All Other Taxes Current AccrualForAllOtherTaxesCurrent	11124000	USD
CY2011Q4	kos	Accrual For All Other Taxes Current AccrualForAllOtherTaxesCurrent	1095000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	1208000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	5066000	USD
CY2011Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-59600000	USD
CY2012	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	1500000	USD
CY2012	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-18302000	USD
CY2011	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-18079000	USD
CY2011Q2	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	341200000	shares
CY2011Q2	kos	Voting Rights Per Common Share VotingRightsPerCommonShare	1	vote
CY2011Q2	kos	Stock Issued During Period Shares New Issues Over Allotment Option StockIssuedDuringPeriodSharesNewIssuesOverAllotmentOption	1500000	shares
CY2011Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	34500000	shares
CY2011Q2	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	580400000	USD
CY2010Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	16752000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1775000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1702000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	2345000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2694000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2216000	USD
	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	1643000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-67028000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	34463000	USD
	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	9000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-67028000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	60635000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	63605000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	49502000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	24998000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	81265000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	84405000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	60635000	USD
CY2012Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	84405000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Use of Estimates</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Actual results could differ from these estimates.</font></p></div>
CY2012	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Reclassifications</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Certain prior period amounts have been reclassified to conform with the current year presentation. Such reclassifications had no impact on our reported net income, current assets, total assets, current liabilities, total liabilities or shareholders equity.</font></p></div>
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2300000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	1400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	21562000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	2821000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	2921000	USD
CY2012	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Concentration of Credit Risk</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        There are a variety of factors which affect the market for oil, including the proximity and capacity of transportation facilities, demand for oil, the marketing of competitive fuels and the effects of government regulations on oil production and sales. Our revenue can be materially affected by current economic conditions and the price of oil. However, based on the current demand for crude oil and the fact that alternative purchasers are readily available, we believe that the loss of our marketing agent and/or any of the purchasers identified by our marketing agent would not have a long-term material adverse effect on our financial position or results of operations. We have required our marketing agent to post a letter of credit covering the estimated proceeds from our revenue transactions, until such proceeds are received.</font></p></div>
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	3022000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	3122000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3223000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	6453000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21148000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	20229000	USD
CY2011Q2	kos	Stock Issued During Period Shares Public Issue StockIssuedDuringPeriodSharesPublicIssue	33000000	shares
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4300000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	506000	USD
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.239	pure
CY2012	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	73277000	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	52922000	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-74841000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	14103000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	19362000	USD
CY2010	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-3611000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	5669000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	4402000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1344000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	8135000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	92154000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	41569000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	26033000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	17282000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	11047000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7354000	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	20500000	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	368474000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	368607000	shares
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	20630000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	5714000	USD
CY2012Q4	kos	Operating Loss Carryforwards Foreign Subject To Expiration OperatingLossCarryforwardsForeignSubjectToExpiration	72700000	USD
CY2012Q4	kos	Operating Loss Carryforwards Foreign Not Subject To Expiration OperatingLossCarryforwardsForeignNotSubjectToExpiration	49200000	USD
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2010	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	55706000	USD
CY2010	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	2502000	USD
CY2011Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	1002948000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	34585000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	64473000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	10145000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	3765000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	7622000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	15300000	shares
CY2011	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	24442000	USD
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	133000	shares
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	34472000	USD
CY2012Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	314190000	USD
CY2011Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	135622000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	27316000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	17844000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	11866000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	8068000	USD
CY2012Q4	kos	Number Of Classes Of Common Stock Issued And Outstanding NumberOfClassesOfCommonStockIssuedAndOutstanding	1	item
CY2011	us-gaap	Net Income Loss NetIncomeLoss	-2085000	USD
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
	us-gaap	Net Income Loss NetIncomeLoss	-38191000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-4838000	USD
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	2.962	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.774	pure
CY2012	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	168500000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	86200000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	106500000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13800000	USD

Files In Submission

Name	View Source	Status
0001047469-13-001596-index-headers.html	Edgar Link	pending
0001047469-13-001596-index.html	Edgar Link	pending
0001047469-13-001596.txt	Edgar Link	pending
0001047469-13-001596-xbrl.zip	Edgar Link	pending
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kos-20121231.xml	Edgar Link	completed
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kos-20121231_cal.xml	Edgar Link	unprocessable
kos-20121231_def.xml	Edgar Link	unprocessable
kos-20121231_lab.xml	Edgar Link	unprocessable
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$KOS
Kosmos Energy Ltd. Stock $kos

2011 Q4 Form 10-K Financial Statement

#000104746913001596 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KOS Kosmos Energy Ltd. Stock $kos

2011 Q4 Form 10-K Financial Statement

#000104746913001596 Filed on February 25, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KOS
Kosmos Energy Ltd. Stock $kos