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Receivables (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Mar. 28, 2013
Receivables [Line Items]          
Rents and other receivables, net $ 3,479,000cdr_RentsAndOtherReceivablesNet $ 3,282,000cdr_RentsAndOtherReceivablesNet      
Straight-line rents 14,926,000us-gaap_DeferredRentReceivablesNet 15,210,000us-gaap_DeferredRentReceivablesNet      
Receivables 18,405,000us-gaap_AccountsReceivableNet 18,492,000us-gaap_AccountsReceivableNet      
Loan to developers     4,100,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages    
Impairment charge of mortgage loan receivable     4,400,000cdr_ImpairmentChargeRelatedToMortgageLoanOnRealEstate    
Sale price of property sold         1,100,000cdr_DiscontinuedOperationsPaymentsReceivedFromSaleOfProperty
Amount accepted in full satisfaction of loan         1,100,000cdr_AmountAcceptedInFullSatisfactionOfLoan
Impairment charges/(reversal), net 3,148,000us-gaap_ImpairmentOfRealEstate (172,000)us-gaap_ImpairmentOfRealEstate 5,499,000us-gaap_ImpairmentOfRealEstate    
Continuing Operations [Member]          
Receivables [Line Items]          
Impairment charges/(reversal), net $ 3,400,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
    $ (1,100,000)us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember