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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Oil sales $ 389,770us-gaap_OilAndCondensateRevenue $ 231,837us-gaap_OilAndCondensateRevenue $ 181,163us-gaap_OilAndCondensateRevenue
Natural gas sales 165,461us-gaap_NaturalGasProductionRevenue 188,453us-gaap_NaturalGasProductionRevenue 203,651us-gaap_NaturalGasProductionRevenue
Total oil and gas sales 555,231us-gaap_OilAndGasSalesRevenue 420,290us-gaap_OilAndGasSalesRevenue 384,814us-gaap_OilAndGasSalesRevenue
Gain on sale of oil and gas properties     24,271crk_GainOnSaleOfOilAndGasProperty
Total revenues 555,231us-gaap_Revenues 420,290us-gaap_Revenues 409,085us-gaap_Revenues
Operating expenses:      
Production taxes 23,797crk_ProductionAndSeveranceTaxesOperatingExpense 14,524crk_ProductionAndSeveranceTaxesOperatingExpense 11,727crk_ProductionAndSeveranceTaxesOperatingExpense
Gathering and transportation 12,897us-gaap_GasGatheringTransportationMarketingAndProcessingCosts 17,245us-gaap_GasGatheringTransportationMarketingAndProcessingCosts 26,265us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Lease operating 60,283us-gaap_LeaseOperatingExpense 52,844us-gaap_LeaseOperatingExpense 51,248us-gaap_LeaseOperatingExpense
Exploration 19,403crk_ExplorationExpenseIncludingUnprovedImpairmentsAndExploratoryDryHoleCosts 33,423crk_ExplorationExpenseIncludingUnprovedImpairmentsAndExploratoryDryHoleCosts 61,449crk_ExplorationExpenseIncludingUnprovedImpairmentsAndExploratoryDryHoleCosts
Depreciation, depletion and amortization 378,275us-gaap_DepreciationDepletionAndAmortization 337,134us-gaap_DepreciationDepletionAndAmortization 343,858us-gaap_DepreciationDepletionAndAmortization
General and administrative, net 32,379us-gaap_GeneralAndAdministrativeExpense 34,767us-gaap_GeneralAndAdministrativeExpense 33,798us-gaap_GeneralAndAdministrativeExpense
Impairment of oil and gas properties 60,268us-gaap_ImpairmentOfOilAndGasProperties 652us-gaap_ImpairmentOfOilAndGasProperties 25,368us-gaap_ImpairmentOfOilAndGasProperties
Loss on sale of oil and gas properties   2,033crk_LossOnSaleOfOilAndGasProperty  
Total operating expenses 587,302us-gaap_OperatingExpenses 492,622us-gaap_OperatingExpenses 553,713us-gaap_OperatingExpenses
Operating loss (32,071)us-gaap_OperatingIncomeLoss (72,332)us-gaap_OperatingIncomeLoss (144,628)us-gaap_OperatingIncomeLoss
Other income (expenses):      
Gain on sale of marketable securities   7,877us-gaap_MarketableSecuritiesGainLoss 26,621us-gaap_MarketableSecuritiesGainLoss
Gain (loss) from derivative financial instruments 8,175us-gaap_GainLossOnSaleOfCommodityContracts (8,388)us-gaap_GainLossOnSaleOfCommodityContracts 21,256us-gaap_GainLossOnSaleOfCommodityContracts
Loss on early extinguishment of debt   (17,854)us-gaap_GainsLossesOnExtinguishmentOfDebt  
Other income 727us-gaap_InterestAndOtherIncome 1,059us-gaap_InterestAndOtherIncome 944us-gaap_InterestAndOtherIncome
Interest expense (58,631)us-gaap_InterestExpense (73,242)us-gaap_InterestExpense (57,906)us-gaap_InterestExpense
Total other income (expenses) (49,729)us-gaap_NonoperatingIncomeExpense (90,548)us-gaap_NonoperatingIncomeExpense (9,085)us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income taxes (81,800)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (162,880)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (153,713)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Benefit from income taxes 24,689us-gaap_IncomeTaxExpenseBenefit 56,157us-gaap_IncomeTaxExpenseBenefit 50,634us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations (57,111)us-gaap_IncomeLossFromContinuingOperations (106,723)us-gaap_IncomeLossFromContinuingOperations (103,079)us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations, net of income taxes   147,752us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 3,019us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) $ (57,111)us-gaap_NetIncomeLoss $ 41,029us-gaap_NetIncomeLoss $ (100,060)us-gaap_NetIncomeLoss
Net income (loss) per share:      
Loss from continuing operations, Basic $ (1.24)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from discontinued operations, Basic   $ 3.07us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income (loss), Basic $ (1.24)us-gaap_EarningsPerShareBasic $ 0.85us-gaap_EarningsPerShareBasic $ (2.16)us-gaap_EarningsPerShareBasic
Loss from continuing operations, Diluted $ (1.24)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (2.22)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income from discontinued operations, Diluted   $ 3.07us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss), Diluted $ (1.24)us-gaap_EarningsPerShareDiluted $ 0.85us-gaap_EarningsPerShareDiluted $ (2.16)us-gaap_EarningsPerShareDiluted
Dividends per common share $ 0.500us-gaap_CommonStockDividendsPerShareDeclared $ 0.375us-gaap_CommonStockDividendsPerShareDeclared  
Weighted average shares outstanding:      
Basic 46,547us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 46,553us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 46,422us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 46,547us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 46,553us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 46,422us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding