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Real Estate (Real Estate And Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cost      
Balance, beginning of year $ 1,450,951,000us-gaap_RealEstateInvestmentPropertyAtCost $ 1,423,979,000us-gaap_RealEstateInvestmentPropertyAtCost  
Properties held for sale (81,223,000)cdr_RealEstatePropertyHeldForSale    
Property acquired 91,241,000us-gaap_RealEstateOtherAcquisitions 34,666,000us-gaap_RealEstateOtherAcquisitions 76,185,000us-gaap_RealEstateOtherAcquisitions
Properties sold   (1,351,000)us-gaap_RealEstateCostOfRealEstateSold  
Impairments (6,000)cdr_RealEstateImpairments (928,000)cdr_RealEstateImpairments (332,000)cdr_RealEstateImpairments
Improvements and betterments 15,210,000us-gaap_RealEstateImprovements 13,581,000us-gaap_RealEstateImprovements 27,142,000us-gaap_RealEstateImprovements
Write-off of fully-depreciated assets   (18,996,000)us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount  
Balance, end of year 1,476,173,000us-gaap_RealEstateInvestmentPropertyAtCost 1,450,951,000us-gaap_RealEstateInvestmentPropertyAtCost 1,423,979,000us-gaap_RealEstateInvestmentPropertyAtCost
Accumulated depreciation      
Balance, beginning of the year 251,605,000us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation 229,535,000us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation  
Properties held for sale (18,523,000)cdr_RealEstateAccumulatedDepreciationPropertyHeldForSale    
Depreciation expense 34,129,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 41,066,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 40,026,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Balance, end of the year 267,211,000us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation 251,605,000us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation 229,535,000us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Net book value $ 1,208,962,000us-gaap_RealEstateInvestmentPropertyNet $ 1,199,346,000us-gaap_RealEstateInvestmentPropertyNet $ 1,194,444,000us-gaap_RealEstateInvestmentPropertyNet