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Mortgage Loans Payable And Credit Facility (Schedule Of Mortgage Loans Payable Repaid) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
New London Mall [Member] |
Debt Instrument [Line Items] |
Repayment Date | Feb. 01, 2015
Principal Payoff Amount | $ 27,365,000 us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember
Oak Ridge Shopping Center [Member] |
Debt Instrument [Line Items] |
Repayment Date | Mar. 11, 2015
Principal Payoff Amount | $ 3,155,000 us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_OakRidgeMember

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

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

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