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Share-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for grant under Stock Incentive Plan 1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Time-Based Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares issued 176,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= cdr_TimeBasedAwardsMember
Weighted-average grant date fair value per share $ 7.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cdr_TimeBasedAwardsMember