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Summary Of Significant Accounting Policies (Supplemental Consolidated Statements Of Cash Flows Information) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental disclosure of cash activities:      
Cash paid for interest $ 32,275,000us-gaap_InterestPaid $ 36,114,000us-gaap_InterestPaid $ 43,663,000us-gaap_InterestPaid
Supplemental disclosure of non-cash activities:      
Capitalization of interest and financing costs 757,000us-gaap_InterestCostsCapitalized 915,000us-gaap_InterestCostsCapitalized 1,314,000us-gaap_InterestCostsCapitalized
Mortgage loans payable assumed upon acquisition (53,439,000)us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1    
Mortgage loans payable assumed by buyer 15,557,000us-gaap_TransferMortgagePayable   76,632,000us-gaap_TransferMortgagePayable
Conversions of OP Units into common stock 371,000cdr_ConversionOfOperatingPartnershipUnitsIntoCommonStock 24,000cdr_ConversionOfOperatingPartnershipUnitsIntoCommonStock 7,895,000cdr_ConversionOfOperatingPartnershipUnitsIntoCommonStock
Issuance of OP Units in connection with a property acquisition   (1,500,000)cdr_OperatingPartnershipUnitsIssuedInConnectionWithPropertyAcquisitionValue  
Deed-in-lieu of foreclosure of properties:      
Real estate transferred (6,238,000)us-gaap_TransferOfOtherRealEstate (4,724,000)us-gaap_TransferOfOtherRealEstate  
Mortgage loan payable and related obligations settled 7,661,000cdr_MortgageLoanPayableAndRelatedObligationsSettledInForclosure 13,878,000cdr_MortgageLoanPayableAndRelatedObligationsSettledInForclosure  
Acquisition of noncontrolling interests in consolidated joint venture properties     7,595,000cdr_AcquisitionOfNoncontrollingInterestInConsolidatedJointVentureProperties
Disposition of noncontrolling interests in consolidated joint venture properties     (36,840,000)cdr_DispositionOfNoncontrollingInterestInConsolidatedJointVentureProperties
Exchange of joint venture interest for 100% interest in unconsolidated joint venture property:      
Real estate and related assets acquired     75,127,000cdr_RealEstateAcquiredInExchangeOfInterestInJointVenture
Mortgage loans payable assumed     $ (43,112,000)us-gaap_LoansAssumed1