Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Term Loans) (Details)

v2.4.1.9
Borrowings (Term Loans) (Details) (Secured second lien term loan [Member], USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended
Oct. 08, 2014
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Long-term debt, gross   $ 300,000us-gaap_DebtInstrumentCarryingAmount $ 300,000us-gaap_DebtInstrumentCarryingAmount
Proceeds from Issuance of Debt $ 300,000us-gaap_ProceedsFromIssuanceOfDebt    
Debt Instrument, Interest Rate, Effective Percentage   8.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage  
Floor rate 1.00%cpe_DebtInstrumentFloorRate    
Basis Spread on LIBOR (as a percent) 7.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1    
Debt Instrument, Maturity Date   Oct. 08, 2021  
Prior to First Anniversary [Member]
     
Line of Credit Facility [Line Items]      
Line of Credit Facility, Prepayment Premium Percentage 102.00%cpe_LineofCreditFacilityPrepaymentPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= cpe_SecondLienTermLoanFacilityMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
   
After First Anniversary but Prior to Second Anniversary [Member]
     
Line of Credit Facility [Line Items]      
Line of Credit Facility, Prepayment Premium Percentage 101.00%cpe_LineofCreditFacilityPrepaymentPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= cpe_SecondLienTermLoanFacilityMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
   
After Second Anniversary [Member]
     
Line of Credit Facility [Line Items]      
Line of Credit Facility, Prepayment Premium Percentage 100.00%cpe_LineofCreditFacilityPrepaymentPremiumPercentage
/ us-gaap_DebtInstrumentAxis
= cpe_SecondLienTermLoanFacilityMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember