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Unaudited Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues    
Crude oil and natural gas sales $ 581,192us-gaap_OilAndGasSalesRevenue $ 972,147us-gaap_OilAndGasSalesRevenue
Crude oil and natural gas sales to affiliates 1,400us-gaap_RevenueFromRelatedParties 30,186us-gaap_RevenueFromRelatedParties
Gain (loss) on derivative instruments, net 32,755us-gaap_GainLossOnDerivativeInstrumentsNetPretax (39,674)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Crude oil and natural gas service operations 10,297clr_OilAndNaturalGasServiceOperationsRevenues 9,836clr_OilAndNaturalGasServiceOperationsRevenues
Total revenues 625,644us-gaap_Revenues 972,495us-gaap_Revenues
Operating costs and expenses    
Production expenses 91,355us-gaap_OilAndGasProductionExpense 75,976us-gaap_OilAndGasProductionExpense
Production expenses to affiliates 1,586us-gaap_AffiliateCosts 910us-gaap_AffiliateCosts
Production taxes and other expenses 48,362clr_ProductionTaxAndOtherExpenses 78,302clr_ProductionTaxAndOtherExpenses
Exploration expenses 14,340us-gaap_ExplorationExpense 4,813us-gaap_ExplorationExpense
Crude oil and natural gas service operations 3,894clr_OilAndNaturalGasServiceOperationsExpenses 8,074clr_OilAndNaturalGasServiceOperationsExpenses
Depreciation, depletion, amortization and accretion 386,512us-gaap_DepreciationDepletionAndAmortization 272,861us-gaap_DepreciationDepletionAndAmortization
Property impairments 147,561us-gaap_ImpairmentOfOilAndGasProperties 58,208us-gaap_ImpairmentOfOilAndGasProperties
General and administrative expenses 45,380us-gaap_GeneralAndAdministrativeExpense 43,536us-gaap_GeneralAndAdministrativeExpense
(Gain) loss on sale of assets, net (2,070)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 8,498us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Total operating costs and expenses 736,920us-gaap_OperatingExpenses 551,178us-gaap_OperatingExpenses
Income (loss) from operations (111,276)us-gaap_OperatingIncomeLoss 421,317us-gaap_OperatingIncomeLoss
Other income (expense):    
Interest expense (75,063)us-gaap_InterestExpense (62,975)us-gaap_InterestExpense
Other 347us-gaap_OtherNonoperatingIncome 759us-gaap_OtherNonoperatingIncome
Total other income (expense) (74,716)us-gaap_NonoperatingIncomeExpense (62,216)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes (185,992)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 359,101us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision (benefit) for income taxes (54,021)us-gaap_IncomeTaxExpenseBenefit 132,867us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (131,971)us-gaap_NetIncomeLoss 226,234us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (3,105)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ (135,076)us-gaap_ComprehensiveIncomeNetOfTax $ 226,234us-gaap_ComprehensiveIncomeNetOfTax
Basic net income (loss) per share (in dollars per share) $ (0.36)us-gaap_EarningsPerShareBasic $ 0.61us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share (in dollars per share) $ (0.36)us-gaap_EarningsPerShareDiluted $ 0.61us-gaap_EarningsPerShareDiluted