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Stock-Based Compensation--2010 Equity Incentive Plan Summary and Modifications (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 01, 2014
Phantom Stock Plan [Member] | Phantom Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Class A Common Stock [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance under the 2010 Plan 86,301us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Performance Vested, modified [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of Performance Vested awards outstanding modified 20.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationOutstandingAwardsModifiedPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_VestingAxis
= cpr_ModifiedMarketandPerformanceVestingConditionsMember
   
Incremental compensation cost 8,536us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_VestingAxis
= cpr_ModifiedMarketandPerformanceVestingConditionsMember
$ 4,322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_VestingAxis
= cpr_ModifiedMarketandPerformanceVestingConditionsMember
 
Performance Vested, modified [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member] | Return On Investment Target Five [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return On Investment Target Percentage 400.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnOnInvestmentTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetFiveMember
/ us-gaap_VestingAxis
= cpr_ModifiedMarketandPerformanceVestingConditionsMember
  350.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnOnInvestmentTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetFiveMember
/ us-gaap_VestingAxis
= cpr_ModifiedMarketandPerformanceVestingConditionsMember
Performance Vested [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member] | Return On Investment Target One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return On Investment Target Percentage 175.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnOnInvestmentTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetOneMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Vesting Percentage 33.00%cpr_ShareBasedCompensationVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetOneMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Performance Vested [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member] | Return On Investment Target Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return On Investment Target Percentage 200.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnOnInvestmentTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetTwoMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Vesting Percentage 33.00%cpr_ShareBasedCompensationVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetTwoMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Performance Vested [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member] | Return On Investment Target Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Return On Investment Target Percentage 250.00%cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardReturnOnInvestmentTargetPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetThreeMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Vesting Percentage 34.00%cpr_ShareBasedCompensationVestingPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ cpr_ScheduleOfShareBasedCompensationArrangementsAxis
= cpr_ShareBasedCompensationReturnOnInvestmentTargetThreeMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
   
Performance Vested [Member] | Class A Common Stock [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications, Weighted Average Grant Date Fair Value 296.69cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
$ 324.47cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modified in Period (9,339)cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
(11,169)cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_MarketAndPerformanceVestingConditionsMember
 
Time Vested [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
Time Vested [Member] | Class A Common Stock [Member] | 2010 Equity Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modifications, Weighted Average Grant Date Fair Value 969.00cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_ServiceVestingConditionsMember
$ 626.00cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModificationsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_ServiceVestingConditionsMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Modified in Period 9,339cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_ServiceVestingConditionsMember
11,169cpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cpr_TwoThousandTenEquityIncentivePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_VestingAxis
= cpr_ServiceVestingConditionsMember