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Share-Based Compensation (Details 8) (Incentive Unit Award, USD $)
3 Months Ended
Mar. 31, 2015
Incentive Unit Award
 
Non-vested shares activity  
Non-vested at the beginning of the period (in shares) 435,515us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Granted (in shares) 2,652us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Vested (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Forfeited (in shares) (3,742)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Non-vested at the end of the period (in shares) 434,425us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Weighted-Average Grant-Date Fair Value  
Non-vested at the beginning of the period (in dollars per share) $ 18.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Granted (in dollars per share) $ 18.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Vested (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Forfeited (in dollars per share) $ 20.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember
Non-vested at the end of the period (in dollars per share) $ 18.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvi_IncentiveUnitAwardMember