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Mortgage Loans Payable And Credit Facility (Schedule Of Mortgage Loans Payable Repaid) (Details) - 6 months ended Jun. 30, 2015 - USD ($)	Total
New London Mall [Member]
Debt Instrument [Line Items]
Repayment Date	Feb. 01, 2015
Principal Payoff Amount	$ 27,365,000
Oak Ridge Shopping Center [Member]
Debt Instrument [Line Items]
Repayment Date	Mar. 11, 2015
Principal Payoff Amount	$ 3,155,000
Pine Grove Plaza [Member]
Debt Instrument [Line Items]
Repayment Date	Jun. 01, 2015
Principal Payoff Amount	$ 5,139,000

X

- 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

X

- 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

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:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=cdr_PineGrovePlazaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: