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Derivative Instruments--Derivative Settlements Outstanding (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative settlements receivable included in accounts receivable $ 19,678cpr_DerivativeSettlementsReceivable $ 4,616cpr_DerivativeSettlementsReceivable
Derivative settlements payable included in accounts payable and accrued liabilities $ 0cpr_DerivativeInstrumentSettlementsPayable $ 377cpr_DerivativeInstrumentSettlementsPayable