$KOS
Kosmos Energy Ltd. Stock $kos

$kos Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000150999118000014 Filed on February 26, 2018

Income Statement

Concept	2017 Q4	2016 Q4	2016 Q3
Revenue	$187.1M	$210.9M	$66.63M
YoY Change	-11.29%	73.31%	-31.03%
Cost Of Revenue	$46.20M	$43.70M	$13.60M
YoY Change	5.72%	46.15%	-41.38%
Gross Profit	$140.9M	$112.4M	$33.10M
YoY Change	25.36%	22.31%	-54.9%
Gross Profit Margin	75.31%	53.29%	49.68%
Selling, General & Admin	$17.70M	$28.00M	$21.90M
YoY Change	-36.79%	-7.59%	-17.98%
% of Gross Profit	12.56%	24.91%	66.16%
Research & Development	$53.40M	$75.80M	$66.20M
YoY Change	-29.55%	218.49%	250.26%
% of Gross Profit	37.9%	67.44%	200.0%
Depreciation & Amortization	$76.80M	$76.90M	$20.40M
YoY Change	-0.13%	60.21%	-47.01%
% of Gross Profit	54.51%	68.42%	61.63%
Operating Expenses	$137.9M	$195.5M	$111.8M
YoY Change	-29.46%	96.48%	36.67%
Operating Profit	$3.000M	-$83.10M	-$78.70M
YoY Change	-103.61%	993.42%	836.9%
Interest Expense	-$124.5M	-$29.10M	$6.500M
YoY Change	327.84%	-139.59%	-95.08%
% of Operating Profit	-4150.0%
Other Income/Expense, Net	$0.00	$54.80M	$795.0K
YoY Change	-100.0%	54700.0%	-161.15%
Pretax Income	-$121.5M	-$57.40M	-$52.26M
YoY Change	111.67%	-186.97%	-142.66%
Income Tax	-$16.20M	-$700.0K	$7.502M
% Of Pretax Income
Net Earnings	-$122.1M	-$56.70M	-$59.76M
YoY Change	115.31%	-336.25%	-199.11%
Net Earnings / Revenue	-65.25%	-26.88%	-89.7%
Basic Earnings Per Share	-$0.31	-$0.15	-$0.15
Diluted Earnings Per Share	-$0.31	-$0.15	-$0.15
COMMON SHARES
Basic Shares Outstanding	389.4M shares		386.0M shares
Diluted Shares Outstanding			386.0M shares

Balance Sheet

Concept	2017 Q4	2016 Q4	2016 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$233.4M	$194.1M	$109.0M
YoY Change	20.25%	-29.42%	-70.22%
Cash & Equivalents	$233.4M	$194.1M	$186.3M
Short-Term Investments
Other Short-Term Assets	$67.40M	$63.40M	$103.6M
YoY Change	6.31%	-73.14%	-57.89%
Inventory	$71.86M	$74.38M	$82.10M
Prepaid Expenses
Receivables	$0.00	$54.20M	$52.00M
Other Receivables	$25.62M	$25.89M	$39.90M
Total Short-Term Assets	$533.6M	$475.2M	$386.6M
YoY Change	12.29%	-35.27%	-52.7%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.318B	$2.709B	$2.758B
YoY Change	-14.44%	16.62%	30.07%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$236.5M	$0.00	$12.50M
YoY Change		-100.0%	-81.12%
Other Assets	$104.6M	$153.6M	$144.5M
YoY Change	-31.9%	78.19%	43.21%
Total Long-Term Assets	$2.659B	$2.866B	$2.915B
YoY Change	-7.23%	16.09%	27.43%
TOTAL ASSETS
Total Short-Term Assets	$533.6M	$475.2M	$386.6M
Total Long-Term Assets	$2.659B	$2.866B	$2.915B
Total Assets	$3.193B	$3.341B	$3.302B
YoY Change	-4.45%	4.32%	6.34%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$141.8M	$220.6M	$174.0M
YoY Change	-35.73%	-25.39%	-32.9%
Accrued Expenses	$219.4M	$129.7M	$97.20M
YoY Change	69.16%	-17.12%	-24.12%
Deferred Revenue	$0.00
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$428.7M	$370.0M	$282.5M
YoY Change	15.87%	-18.98%	-37.97%
LONG-TERM LIABILITIES
Long-Term Debt	$1.283B	$1.322B	$1.319B
YoY Change	-2.96%	53.55%	46.66%
Other Long-Term Liabilities	$10.61M	$8.449M	$88.30M
YoY Change	25.6%	-85.36%	39.49%
Total Long-Term Liabilities	$1.867B	$1.890B	$1.407B
YoY Change	-1.24%	105.77%	46.19%
TOTAL LIABILITIES
Total Short-Term Liabilities	$428.7M	$370.0M	$282.5M
Total Long-Term Liabilities	$1.867B	$1.890B	$1.407B
Total Liabilities	$2.295B	$2.260B	$2.174B
YoY Change	1.56%	20.39%	19.69%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.073B	-$850.4M
YoY Change	26.2%
Common Stock	$2.019B	$1.979B
YoY Change	1.99%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$48.20M	$47.60M
YoY Change	1.26%
Treasury Stock Shares	9.189M shares	9.101M shares
Shareholders Equity	$897.1M	$1.081B	$1.128B
YoY Change
Total Liabilities & Shareholders Equity	$3.193B	$3.341B	$3.302B
YoY Change	-4.45%	4.32%	6.34%

Cashflow Statement

Concept	2017 Q4	2016 Q4	2016 Q3
OPERATING ACTIVITIES
Net Income	-$122.1M	-$56.70M	-$59.76M
YoY Change	115.31%	-336.25%	-199.11%
Depreciation, Depletion And Amortization	$76.80M	$76.90M	$20.40M
YoY Change	-0.13%	60.21%	-47.01%
Cash From Operating Activities	$142.2M	$117.7M	-$41.50M
YoY Change	20.82%	-30.07%	-121.96%
INVESTING ACTIVITIES
Capital Expenditures	-$41.00M	-$30.70M	-$89.00M
YoY Change	33.55%	-88.42%	-49.26%
Acquisitions
YoY Change
Other Investing Activities	-$231.3M	$0.00	$43.20M
YoY Change		-100.0%	43100.0%
Cash From Investing Activities	-$272.3M	-$30.80M	-$45.70M
YoY Change	784.09%	-87.94%	-73.93%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	199.8M	-100.0K	124.9M
YoY Change	-199900.0%	-50.0%	25.15%
NET CHANGE
Cash From Operating Activities	142.2M	117.7M	-41.50M
Cash From Investing Activities	-272.3M	-30.80M	-45.70M
Cash From Financing Activities	199.8M	-100.0K	124.9M
Net Change In Cash	69.70M	86.80M	37.70M
YoY Change	-19.7%	-199.43%	-66.78%
FREE CASH FLOW
Cash From Operating Activities	$142.2M	$117.7M	-$41.50M
Capital Expenditures	-$41.00M	-$30.70M	-$89.00M
Free Cash Flow	$183.2M	$148.4M	$47.50M
YoY Change	23.45%	-65.75%	-86.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	kos	Accrued Exploration Development And Production Costs Current AccruedExplorationDevelopmentAndProductionCostsCurrent	144717000	USD
CY2016Q4	kos	Accrued General And Administrative Expenses Current AccruedGeneralAndAdministrativeExpensesCurrent	31243000	USD
CY2017Q4	kos	Accrued General And Administrative Expenses Current AccruedGeneralAndAdministrativeExpensesCurrent	31124000	USD
CY2015	kos	Capitalized Exploratory Well Cost Addition For Dissolution Of Equity Method Investment CapitalizedExploratoryWellCostAdditionForDissolutionOfEquityMethodInvestment	0	USD
CY2016	kos	Capitalized Exploratory Well Cost Addition For Dissolution Of Equity Method Investment CapitalizedExploratoryWellCostAdditionForDissolutionOfEquityMethodInvestment	0	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001509991
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	395706528	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1462148287	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Kosmos Energy Ltd.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	kos	Accrual For All Other Taxes Current AccrualForAllOtherTaxesCurrent	1914000	USD
CY2017Q4	kos	Accrual For All Other Taxes Current AccrualForAllOtherTaxesCurrent	3270000	USD
CY2016Q4	kos	Accrued Exploration Development And Production Costs Current AccruedExplorationDevelopmentAndProductionCostsCurrent	76194000	USD
CY2017	kos	Capitalized Exploratory Well Cost Addition For Dissolution Of Equity Method Investment CapitalizedExploratoryWellCostAdditionForDissolutionOfEquityMethodInvestment	121128000	USD
CY2015	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	23375000	USD
CY2016	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	0	USD
CY2017	kos	Capitalized Exploratory Well Cost Charged To Expense Excluding Costs Capitalized And Expensed In Same Period CapitalizedExploratoryWellCostChargedToExpenseExcludingCostsCapitalizedAndExpensedInSamePeriod	0	USD
CY2015	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	70300000	USD
CY2016	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	2400000	USD
CY2017	kos	Capitalized Exploratory Well Cost Expensed In Same Period CapitalizedExploratoryWellCostExpensedInSamePeriod	43200000	USD
CY2015	kos	Capitalized Exploratory Well Cost Reduction For Contribution To Equity Method Investment CapitalizedExploratoryWellCostReductionForContributionToEquityMethodInvestment	0	USD
CY2016	kos	Capitalized Exploratory Well Cost Reduction For Contribution To Equity Method Investment CapitalizedExploratoryWellCostReductionForContributionToEquityMethodInvestment	0	USD
CY2017	kos	Capitalized Exploratory Well Cost Reduction For Contribution To Equity Method Investment CapitalizedExploratoryWellCostReductionForContributionToEquityMethodInvestment	131764000	USD
CY2015	kos	Capitalized Exploratory Well Cost Reduction For Divestitures CapitalizedExploratoryWellCostReductionForDivestitures	0	USD
CY2016	kos	Capitalized Exploratory Well Cost Reduction For Divestitures CapitalizedExploratoryWellCostReductionForDivestitures	0	USD
CY2017	kos	Capitalized Exploratory Well Cost Reduction For Divestitures CapitalizedExploratoryWellCostReductionForDivestitures	206400000	USD
CY2015Q4	kos	Capitalized Exploratory Well Costs Greater Than Or Equal To One Year And Less Than Three Years CapitalizedExploratoryWellCostsGreaterThanOrEqualToOneYearAndLessThanThreeYears	17702000	USD
CY2016Q4	kos	Capitalized Exploratory Well Costs Greater Than Or Equal To One Year And Less Than Three Years CapitalizedExploratoryWellCostsGreaterThanOrEqualToOneYearAndLessThanThreeYears	244804000	USD
CY2017Q4	kos	Capitalized Exploratory Well Costs Greater Than Or Equal To One Year And Less Than Three Years CapitalizedExploratoryWellCostsGreaterThanOrEqualToOneYearAndLessThanThreeYears	291252000	USD
CY2015Q4	kos	Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears	209693000	USD
CY2016Q4	kos	Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears	209850000	USD
CY2017Q4	kos	Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears Capitalizedexploratorywellcostsgreaterthanorequaltothreeyearsandlessthansixyears	51702000	USD
CY2015	kos	Cash Settlements On Commodity Derivatives CashSettlementsOnCommodityDerivatives	225500000	USD
CY2016	kos	Cash Settlements On Commodity Derivatives CashSettlementsOnCommodityDerivatives	188000000	USD
CY2017	kos	Cash Settlements On Commodity Derivatives CashSettlementsOnCommodityDerivatives	38700000	USD
CY2015	kos	Cash Settlements On Derivatives CashSettlementsOnDerivatives	224741000	USD
CY2016	kos	Cash Settlements On Derivatives CashSettlementsOnDerivatives	188895000	USD
CY2017	kos	Cash Settlements On Derivatives CashSettlementsOnDerivatives	25888000	USD
CY2015	kos	Contribution To Equity Method Investment ContributionToEquityMethodInvestment	0	USD
CY2016	kos	Contribution To Equity Method Investment ContributionToEquityMethodInvestment	0	USD
CY2017	kos	Contribution To Equity Method Investment ContributionToEquityMethodInvestment	133893000	USD
CY2015	kos	Conversion Of Joint Interest Billings Receivable From Current To Noncurrent ConversionOfJointInterestBillingsReceivableFromCurrentToNoncurrent	0	USD
CY2016	kos	Conversion Of Joint Interest Billings Receivable From Current To Noncurrent ConversionOfJointInterestBillingsReceivableFromCurrentToNoncurrent	9814000	USD
CY2017	kos	Conversion Of Joint Interest Billings Receivable From Current To Noncurrent ConversionOfJointInterestBillingsReceivableFromCurrentToNoncurrent	0	USD
CY2016Q4	kos	Debt Instrument Unamortized Issuance Costs And Discounts DebtInstrumentUnamortizedIssuanceCostsAndDiscounts	53126000	USD
CY2017Q4	kos	Debt Instrument Unamortized Issuance Costs And Discounts DebtInstrumentUnamortizedIssuanceCostsAndDiscounts	42203000	USD
CY2015	kos	Deferred Interest DeferredInterest	1770000	USD
CY2016	kos	Deferred Interest DeferredInterest	-581000	USD
CY2017	kos	Deferred Interest DeferredInterest	2577000	USD
CY2016Q4	kos	Deferred Tax Assets Asset Retirement Obligation And Other DeferredTaxAssetsAssetRetirementObligationAndOther	33744000	USD
CY2017Q4	kos	Deferred Tax Assets Asset Retirement Obligation And Other DeferredTaxAssetsAssetRetirementObligationAndOther	24784000	USD
CY2016Q4	kos	Deferred Tax Assets Foreign Capitalized Operating Expenses DeferredTaxAssetsForeignCapitalizedOperatingExpenses	69804000	USD
CY2017Q4	kos	Deferred Tax Assets Foreign Capitalized Operating Expenses DeferredTaxAssetsForeignCapitalizedOperatingExpenses	68218000	USD
CY2015	kos	Disputed Partner Charges And Related Expenses DisputedPartnerChargesAndRelatedExpenses	0	USD
CY2016	kos	Disputed Partner Charges And Related Expenses DisputedPartnerChargesAndRelatedExpenses	11299000	USD
CY2017	kos	Disputed Partner Charges And Related Expenses DisputedPartnerChargesAndRelatedExpenses	4962000	USD
CY2015	kos	Dissolution Of Equity Method Investment DissolutionOfEquityMethodInvestment	0	USD
CY2016	kos	Dissolution Of Equity Method Investment DissolutionOfEquityMethodInvestment	0	USD
CY2017	kos	Dissolution Of Equity Method Investment DissolutionOfEquityMethodInvestment	122407000	USD
CY2017	kos	Effective Income Tax Rate Reconciliation Nondeductible Expense Interest Expense Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpenseAmount	4700000	USD
CY2015	kos	Facilities Insurance Modifications Expense Income FacilitiesInsuranceModificationsExpenseIncome	0	USD
CY2016	kos	Facilities Insurance Modifications Expense Income FacilitiesInsuranceModificationsExpenseIncome	14961000	USD
CY2017	kos	Facilities Insurance Modifications Expense Income FacilitiesInsuranceModificationsExpenseIncome	-820000	USD
CY2015	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	210649000	USD
CY2016	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	-48021000	USD
CY2017	kos	Gain Loss On Commodity Derivative Instruments Net Pretax GainLossOnCommodityDerivativeInstrumentsNetPretax	-59968000	USD
CY2015	kos	Gain Loss On Insurance Settlements GainLossOnInsuranceSettlements	-4151000	USD
CY2016	kos	Gain Loss On Insurance Settlements GainLossOnInsuranceSettlements	4003000	USD
CY2017	kos	Gain Loss On Insurance Settlements GainLossOnInsuranceSettlements	461000	USD
CY2015	kos	Interest And Other Financing Costs Other Net InterestAndOtherFinancingCostsOtherNet	3289000	USD
CY2016	kos	Interest And Other Financing Costs Other Net InterestAndOtherFinancingCostsOtherNet	7252000	USD
CY2017	kos	Interest And Other Financing Costs Other Net InterestAndOtherFinancingCostsOtherNet	5831000	USD
CY2015	kos	Interest Expense Income Net InterestExpenseIncomeNet	37209000	USD
CY2016	kos	Interest Expense Income Net InterestExpenseIncomeNet	44147000	USD
CY2017	kos	Interest Expense Income Net InterestExpenseIncomeNet	77595000	USD
CY2016Q4	kos	Oil And Gas Imbalance Asset Liability OilAndGasImbalanceAssetLiability	0	USD
CY2017Q4	kos	Oil And Gas Imbalance Asset Liability OilAndGasImbalanceAssetLiability	0	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Eight OperatingLossCarryForwardsForeignExpiringYearEight	15000000	USD
CY2017Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	17423000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	129706000	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Five OperatingLossCarryForwardsForeignExpiringYearFive	500000	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Four OperatingLossCarryForwardsForeignExpiringYearFour	500000	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Seven OperatingLossCarryForwardsForeignExpiringYearSeven	700000	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Six OperatingLossCarryForwardsForeignExpiringYearSix	600000	USD
CY2017Q4	kos	Operating Loss Carry Forwards Foreign Expiring Year Three OperatingLossCarryForwardsForeignExpiringYearThree	900000	USD
CY2017Q4	kos	Operating Loss Carryforwards Foreign OperatingLossCarryforwardsForeign	94100000	USD
CY2017	kos	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	16700000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	220627000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	141787000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	54195000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	0	USD
CY2016Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	2579000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	219412000	USD
CY2016Q4	us-gaap	Accumulated Amortization Of Noncurrent Deferred Finance Costs AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts	11213000	USD
CY2017Q4	us-gaap	Accumulated Amortization Of Noncurrent Deferred Finance Costs AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts	13951000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1975247000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2014525000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	75267000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	41447000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	40899000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	600000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	10324000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	10204000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	10204000	USD
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	11200000	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	11800000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	12900000	shares
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5401000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6966000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	14235000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	0	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	0	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-3945000	USD
CY2015Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	43938000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	63574000	USD
CY2017Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	66595000	USD
CY2016Q4	us-gaap	Assets Assets	3341465000	USD
CY2017Q4	us-gaap	Assets Assets	3192603000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	475187000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	533602000	USD
CY2016Q4	us-gaap	Capitalized Costs Support Equipment And Facilities CapitalizedCostsSupportEquipmentAndFacilities	1386448000	USD
CY2017Q4	us-gaap	Capitalized Costs Support Equipment And Facilities CapitalizedCostsSupportEquipmentAndFacilities	1427054000	USD
CY2015	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	223542000	USD
CY2016	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	307582000	USD
CY2017	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	69567000	USD
CY2014Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	226714000	USD
CY2015Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	426881000	USD
CY2016Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	734463000	USD
CY2017Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	410113000	USD
CY2015Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	199486000	USD
CY2016Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	279809000	USD
CY2017Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Of One Year Or Less CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess	67159000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	275004000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	194057000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	233412000	USD
CY2014Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	586882000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	310862000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	273195000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	304986000	USD
CY2015	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-276020000	USD
CY2016	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-37667000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	31791000	USD
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	395859061	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	398599457	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	3959000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	3986000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-70603000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-283780000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-222792000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	386120000	USD
CY2016Q1	us-gaap	Costs And Expenses CostsAndExpenses	123148000	USD
CY2016Q2	us-gaap	Costs And Expenses CostsAndExpenses	169544000	USD
CY2016Q3	us-gaap	Costs And Expenses CostsAndExpenses	118890000	USD
CY2016Q4	us-gaap	Costs And Expenses CostsAndExpenses	268337000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	679919000	USD
CY2017Q1	us-gaap	Costs And Expenses CostsAndExpenses	158630000	USD
CY2017Q2	us-gaap	Costs And Expenses CostsAndExpenses	131252000	USD
CY2017Q3	us-gaap	Costs And Expenses CostsAndExpenses	216162000	USD
CY2017Q4	us-gaap	Costs And Expenses CostsAndExpenses	308647000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	814691000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	44486000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	12777000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35432000	USD
CY2016Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1375000000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1325000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	37827000	USD
CY2017Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	22517000	USD
CY2016Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	5248000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	2510000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	110786000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-23561000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9505000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	527529000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	533561000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	482221000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	476548000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	170652000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	173055000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	83135000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	79530000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	36352000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	25307000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Not Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration	75900000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	33963000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	30752000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	20783000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	87517000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	93525000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	444394000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	454031000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	584000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	526945000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	533561000	USD
CY2015	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	146600000	USD
CY2016	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	131500000	USD
CY2017	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	244900000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	166290000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	150608000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	265407000	USD
CY2016Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	31698000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	1682000	USD
CY2016Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	3808000	USD
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	39000	USD
CY2015	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	210190000	USD
CY2016	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-46559000	USD
CY2017	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-71822000	USD
CY2016Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	19692000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	67531000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	14123000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	30209000	USD
CY2015	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2016	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	236514000	USD
CY2017	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2016Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	0	USD
CY2017Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	780000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.18
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.15
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.28
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.15
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.15
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.74
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.07
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.02
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.16
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.31
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.57
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.15
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.28
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.15
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.15
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.74
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.07
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CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.16
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.31
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.57
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.82
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.04
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.25
CY2016Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	6300000	USD
CY2017Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	8400000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2015	us-gaap	Exploration Expense ExplorationExpense	156203000	USD
CY2016	us-gaap	Exploration Expense ExplorationExpense	202280000	USD
CY2017	us-gaap	Exploration Expense ExplorationExpense	216050000	USD
CY2015	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	24651000	USD
CY2016	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	0	USD
CY2017	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	0	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-165000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	136809000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	87623000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	68302000	USD
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	85436000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-294564000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-177855000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-6252000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	155272000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-10784000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44937000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	40600000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	29263000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	6008000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	16721000	USD
CY2015	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	94184000	USD
CY2016	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-57898000	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1978000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	0	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1885000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	12347000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	21100000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	18603000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	5504000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	3086000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	153500000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	121400000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	164400000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	35857000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	13997000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	48815000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	111289000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-75487000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-94434000	USD
CY2015	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-17756000	USD
CY2016	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-3567000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	86595000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	29855000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4107000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1653000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-512000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-17557000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	31710000	USD
CY2015	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-2209000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	20558000	USD
CY2017	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-29365000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2015	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	52392000	USD
CY2016	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	59803000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	30282000	USD
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	74897000	USD
CY2016	us-gaap	Interest Costs Incurred InterestCostsIncurred	89029000	USD
CY2017	us-gaap	Interest Costs Incurred InterestCostsIncurred	92687000	USD
CY2015	us-gaap	Interest Paid InterestPaid	33315000	USD
CY2016	us-gaap	Interest Paid InterestPaid	27860000	USD
CY2017	us-gaap	Interest Paid InterestPaid	55381000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	17247000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	20457000	USD
CY2016Q4	us-gaap	Inventory Net InventoryNet	74380000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	71861000	USD
CY2016Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	68100000	USD
CY2017Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	63500000	USD
CY2015	us-gaap	Inventory Write Down InventoryWriteDown	0	USD
CY2015	us-gaap	Inventory Write Down InventoryWriteDown	36000	USD
CY2016	us-gaap	Inventory Write Down InventoryWriteDown	14900000	USD
CY2016	us-gaap	Inventory Write Down InventoryWriteDown	14900000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	900000	USD
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	866000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3341465000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3192603000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	370025000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	428730000	USD
CY2016Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1890241000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	1866761000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	1321874000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	1282797000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	0	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	719652000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	404971000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	200377000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1321874000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1282797000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	79634000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	448019000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-52261000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-796433000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-537763000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-152565000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	440779000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	52077000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	236617000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-69836000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-58993000	USD
CY2017Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	134565000	USD
CY2016Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Noncurrent OilAndGasJointInterestBillingReceivablesNoncurrent	45663000	USD
CY2017Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Noncurrent OilAndGasJointInterestBillingReceivablesNoncurrent	34941000	USD
CY2015	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	105336000	USD
CY2016	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	119367000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	-108324000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	-59763000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	-56700000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-283780000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	-28841000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	-8467000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	-63405000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	-122079000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-222792000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-69836000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-283780000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-222792000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-69836000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-283780000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-222792000	USD
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2016Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	63249000	USD
CY2017	us-gaap	Oil And Gas Production Expense OilAndGasProductionExpense	126850000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	989946000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	1234806000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	3690835000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	3545779000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	2700889000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Net OilAndGasPropertySuccessfulEffortMethodNet	2310973000	USD
CY2015	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	446696000	USD
CY2016	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	310377000	USD
CY2017	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	578139000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	4700000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	3300000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	3300000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	529000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2421000	USD
CY2016Q4	us-gaap	Other Assets OtherAssets	10208000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	29458000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-767000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	767000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	767000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	8449000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	10612000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7875000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-13355000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-5952000	USD
CY2015	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	-1059000	USD
CY2016	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	-920000	USD
CY2017	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	76000	USD
CY2015	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	844000	USD
CY2016	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1954000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	3422000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-5246000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-23116000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-5291000	USD
CY2016Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	25893000	USD
CY2017Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	25616000	USD
CY2015	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	209000	USD
CY2016	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	74978000	USD
CY2017	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	58697000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	18110000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1981000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2194000	USD
CY2015	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	9030000	USD
CY2016	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2017	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	67000	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2016	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	231280000	USD
CY2015	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	823642000	USD
CY2016	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	535975000	USD
CY2017	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	140495000	USD
CY2015	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	1483000	USD
CY2016	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	1998000	USD
CY2017	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	2858000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	7209000	USD
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	9306000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2317828000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	37186000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	39405000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	29183000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	32550000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	8003000	USD
CY2015	us-gaap	Proceeds From Insurance Settlement Operating Activities ProceedsFromInsuranceSettlementOperatingActivities	0	USD
CY2016	us-gaap	Proceeds From Insurance Settlement Operating Activities ProceedsFromInsuranceSettlementOperatingActivities	74800000	USD
CY2017	us-gaap	Proceeds From Insurance Settlement Operating Activities ProceedsFromInsuranceSettlementOperatingActivities	58700000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	100000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	450000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	200000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	206774000	USD
CY2016	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2015	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	28692000	USD
CY2016	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	210000	USD
CY2017	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	222068000	USD
CY2015Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	3	project
CY2016Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	5	project
CY2017Q4	us-gaap	Projects That Have Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	5	project
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2708892000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	6855000	USD
CY2016Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	1385331000	USD
CY2017Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	1653616000	USD
CY2015	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	0	USD
CY2016	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	0	USD
CY2017	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	176881000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	200000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	250000000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	28533000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	24506000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	56380000	USD
CY2015Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	7325000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	54632000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	15194000	USD
CY2015	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	155966000	USD
CY2016	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	140404000	USD
CY2017	us-gaap	Results Of Operations Depreciation Depletion Amortization And Accretion ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion	255203000	USD
CY2015	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	94910000	USD
CY2016	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	6079000	USD
CY2017	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	43201000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-850410000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	1325513000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1081199000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-1073202000	USD
CY2015	us-gaap	Revenues Revenues	471556000	USD
CY2016Q1	us-gaap	Revenues Revenues	62133000	USD
CY2016Q2	us-gaap	Revenues Revenues	45676000	USD
CY2016Q3	us-gaap	Revenues Revenues	66629000	USD
CY2016Q4	us-gaap	Revenues Revenues	210917000	USD
CY2016	us-gaap	Revenues Revenues	385355000	USD
CY2017Q1	us-gaap	Revenues Revenues	151966000	USD
CY2017Q2	us-gaap	Revenues Revenues	146524000	USD
CY2017Q3	us-gaap	Revenues Revenues	151242000	USD
CY2017Q4	us-gaap	Revenues Revenues	187104000	USD
CY2017	us-gaap	Revenues Revenues	636836000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	75057000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	40084000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	39913000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	0	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1338959000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	897112000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	9101395	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	9188819	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	47597000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	48197000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	18110000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1981000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2194000	USD
CY2015	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2016	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2016Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	919056000	USD
CY2017Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	465109000	USD
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	210957000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-46559000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-71822000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	382610000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	385402000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	388375000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	382610000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	385402000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	388375000	shares
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Concentration of Credit Risk</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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.</font></div></div>
CY2017	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Organization</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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 refer to Kosmos Energy Ltd. and its wholly owned subsidiaries, unless the context indicates otherwise.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Kosmos is a leading independent oil and gas exploration and production company focused on frontier and emerging areas along the Atlantic Margins. Our assets include existing production and development projects offshore Ghana and Equatorial Guinea, large discoveries and significant further exploration potential offshore Mauritania and Senegal, as well as exploration licenses offshore Cote d'Ivoire, Equatorial Guinea, Morocco, Sao Tome and Principe, and Suriname. </font><font style="font-family:inherit;font-size:10pt;"> </font><font style="font-family:inherit;font-size:10pt;">Kosmos is listed on the New York Stock Exchange (“NYSE”) and London Stock Exchange ("LSE") and is traded under the ticker symbol KOS.</font><font style="font-family:inherit;font-size:10pt;"> </font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have </font><font style="font-family:inherit;font-size:10pt;">one</font><font style="font-family:inherit;font-size:10pt;"> reportable segment, which is the exploration and production of oil and natural gas. Substantially all of our long‑lived assets and all of our product sales are related to production located offshore Ghana. We also have an equity method investment generating revenues with operations offshore Equatorial Guinea.</font></div></div>
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior period amounts have been reclassified to conform with the current year presentation. Such reclassifications had no material impact on our reported net income (loss), current assets, total assets, current liabilities, total liabilities, shareholders’ equity or cash flows, except as disclosed related to the adoption of recent accounting pronouncements.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">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></div></div>

Files In Submission

Name	View Source	Status
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R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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$KOS
Kosmos Energy Ltd. Stock $kos

2017 Q4 Form 10-K Financial Statement

#000150999118000014 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KOS Kosmos Energy Ltd. Stock $kos

2017 Q4 Form 10-K Financial Statement

#000150999118000014 Filed on February 26, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$KOS
Kosmos Energy Ltd. Stock $kos