Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations (Details)

v2.4.1.9
Asset Retirement Obligations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations at beginning of the period $ 6,732us-gaap_AssetRetirementObligation $ 13,301us-gaap_AssetRetirementObligation
Accretion expense 826us-gaap_AssetRetirementObligationAccretionExpense 1,785us-gaap_AssetRetirementObligationAccretionExpense
Liabilities incurred 638us-gaap_AssetRetirementObligationLiabilitiesIncurred 679us-gaap_AssetRetirementObligationLiabilitiesIncurred
Liabilities assumed 140cpe_AssetRetirementObligationLiabilitiesAssumed  
Liabilities settled (2,130)us-gaap_AssetRetirementObligationLiabilitiesSettled (457)us-gaap_AssetRetirementObligationLiabilitiesSettled
Liabilities related to oil and gas properties sold   (4,765)cpe_AssetRetirementObligationLiabilitiesSold
Revisions to estimate 468us-gaap_AssetRetirementObligationRevisionOfEstimate (3,811)us-gaap_AssetRetirementObligationRevisionOfEstimate
Asset retirement obligations at end of period 6,674us-gaap_AssetRetirementObligation 6,732us-gaap_AssetRetirementObligation
Less: current asset retirement obligations (4,747)us-gaap_AssetRetirementObligationCurrent (4,120)us-gaap_AssetRetirementObligationCurrent
Long-term asset retirement obligations at the end of the period 1,927us-gaap_AssetRetirementObligationsNoncurrent 2,612us-gaap_AssetRetirementObligationsNoncurrent
Restricted Investments    
Restricted investments $ 3,810us-gaap_RestrictedInvestmentsNoncurrent $ 3,806us-gaap_RestrictedInvestmentsNoncurrent