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Long-Term Debt--Debt Issuance Costs and Capital Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Issuance Costs [Abstract]        
Amortization of debt issuance costs $ 2,335us-gaap_AmortizationOfFinancingCosts $ 2,197us-gaap_AmortizationOfFinancingCosts   $ 1,694us-gaap_AmortizationOfFinancingCosts
Capital Leases [Abstract]        
Proceeds from sale leaseback 0us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities 24,500us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities 0us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities  
Capital Lease Obligations [Member] | U.S. Bank National Association [Member]        
Capital Leases [Abstract]        
Proceeds from sale leaseback   24,500us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities
/ us-gaap_CounterpartyNameAxis
= cpr_U.S.BankNationalAssociationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
   
Lease term 84 months      
Purchase option period 72 months      
Implicit interest rate 3.80%us-gaap_SaleLeasebackTransactionImputedInterestRate
/ us-gaap_CounterpartyNameAxis
= cpr_U.S.BankNationalAssociationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
     
Minimum lease payments 3,181us-gaap_SaleLeasebackTransactionAnnualRentalPayments
/ us-gaap_CounterpartyNameAxis
= cpr_U.S.BankNationalAssociationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
     
Other Assets [Member]        
Debt Issuance Costs [Abstract]        
Unamortized debt issuance cost $ 20,937us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
$ 23,273us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember