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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities $ 560,000cdr_InvestmentsRelatedToDeferredCompensationLiabilities [1] $ 492,000cdr_InvestmentsRelatedToDeferredCompensationLiabilities [1]
Share-based compensation liabilities 557,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent [2] 487,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent [2]
Interest rate swaps liability 4,861,000us-gaap_DerivativeLiabilities [2] 2,777,000us-gaap_DerivativeLiabilities [2]
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities 560,000cdr_InvestmentsRelatedToDeferredCompensationLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1] 492,000cdr_InvestmentsRelatedToDeferredCompensationLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [1]
Share-based compensation liabilities 557,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2] 487,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 [2]
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps liability 4,861,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2] 2,777,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities    [1]    [1]
Share-based compensation liabilities    [2]    [2]
Interest rate swaps liability    [2]    [2]
[1] Included in other assets and deferred charges, net in the accompanying consolidated balance sheets.
[2] Included in accounts payable and accrued liabilities in the accompanying consolidated balance sheets.