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Consolidated balance sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets    
Cash and cash equivalents $ 31,492us-gaap_CashAndCashEquivalentsAtCarryingValue $ 48,595us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 98,444us-gaap_ReceivablesNetCurrent 96,515us-gaap_ReceivablesNetCurrent
Inventories, net 25,557us-gaap_InventoryNet 16,137us-gaap_InventoryNet
Prepaid expenses 4,484us-gaap_PrepaidExpenseCurrent 3,998us-gaap_PrepaidExpenseCurrent
Derivative instruments 179,921us-gaap_DerivativeAssetsCurrent 2,152us-gaap_DerivativeAssetsCurrent
Deferred income taxes 0us-gaap_DeferredTaxAssetsGrossCurrent 9,260us-gaap_DeferredTaxAssetsGrossCurrent
Total current assets 339,898us-gaap_AssetsCurrent 176,657us-gaap_AssetsCurrent
Property and equipment—at cost, net 66,561us-gaap_PropertyPlantAndEquipmentNet 69,426us-gaap_PropertyPlantAndEquipmentNet
Oil and natural gas properties, using the full cost method:    
Proved 3,735,817us-gaap_CapitalizedCostsProvedProperties 3,258,661us-gaap_CapitalizedCostsProvedProperties
Unevaluated (excluded from the amortization base) 288,425us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 321,477us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
Accumulated depreciation, depletion, amortization and impairment (1,701,851)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities (1,470,090)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Total oil and natural gas properties 2,322,391us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet 2,110,048us-gaap_CapitalizedCostsOilAndGasProducingActivitiesNet
Derivative instruments 71,710us-gaap_DerivativeAssetsNoncurrent 6,403us-gaap_DerivativeAssetsNoncurrent
Other assets 31,256us-gaap_OtherAssetsNoncurrent 35,348us-gaap_OtherAssetsNoncurrent
Total assets 2,831,816us-gaap_Assets 2,397,882us-gaap_Assets
Liabilities and stockholders' equity    
Accounts payable and accrued liabilities 191,957us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent 134,811us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent
Accrued payroll and benefits payable 21,654us-gaap_EmployeeRelatedLiabilitiesCurrent 24,246us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued interest payable 24,106us-gaap_InterestPayableCurrent 24,225us-gaap_InterestPayableCurrent
Revenue distribution payable 24,467cpr_RevenuePayableCurrent 25,138cpr_RevenuePayableCurrent
Current maturities of long-term debt and capital leases 5,377us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent 5,334us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Derivative instruments 77us-gaap_DerivativeLiabilitiesCurrent 8,234us-gaap_DerivativeLiabilitiesCurrent
Deferred income taxes 60,728us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Total current liabilities 328,366us-gaap_LiabilitiesCurrent 221,988us-gaap_LiabilitiesCurrent
Long-term debt and capital leases, less current maturities 1,628,425us-gaap_LongTermDebtAndCapitalLeaseObligations 1,557,528us-gaap_LongTermDebtAndCapitalLeaseObligations
Derivative instruments 0us-gaap_DerivativeLiabilitiesNoncurrent 0us-gaap_DerivativeLiabilitiesNoncurrent
Stock-based compensation 3,131us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent 4,942us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Asset retirement obligations 43,277us-gaap_AssetRetirementObligationsNoncurrent 53,305us-gaap_AssetRetirementObligationsNoncurrent
Deferred income taxes 116,759us-gaap_DeferredTaxLiabilitiesNoncurrent 62,855us-gaap_DeferredTaxLiabilitiesNoncurrent
Commitments and contingencies (Note 13)      
Stockholders' equity:    
Preferred stock, 600,000 shares authorized, none issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Additional paid in capital 429,678us-gaap_AdditionalPaidInCapitalCommonStock 424,377us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 282,166us-gaap_RetainedEarningsAccumulatedDeficit 72,873us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 711,858us-gaap_StockholdersEquity 497,264us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 2,831,816us-gaap_LiabilitiesAndStockholdersEquity 2,397,882us-gaap_LiabilitiesAndStockholdersEquity
Class A Common Stock [Member]    
Stockholders' equity:    
Common stock 4us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock [Member]    
Stockholders' equity:    
Common stock 3us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 4us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Class C Common Stock [Member]    
Stockholders' equity:    
Common stock 2us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 2us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
Class D Common Stock [Member]    
Stockholders' equity:    
Common stock 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassDMember		 3us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassDMember
Class E Common Stock [Member]    
Stockholders' equity:    
Common stock 5us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassEMember		 5us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassEMember
Class F Common Stock [Member]    
Stockholders' equity:    
Common stock 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassFMember		 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassFMember
Class G Common Stock [Member]    
Stockholders' equity:    
Common stock $ 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassGMember		 $ 0us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= cpr_CommonClassGMember