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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loans Payable Repaid) (Details) - Gold Star Plaza [Member] - Mortgage Loans Payable [Member] | 3 Months Ended
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Mar. 31, 2016 USD ($)
Debt Instrument [Line Items] |
Repayment date | Mar. 10, 2016
Principal payoff amount | $ 953,000

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- Definition Mortgage Repayment Date + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=cdr_GoldStarPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cdr_MortgageLoansPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |