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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
	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Repayment date	Mar. 10, 2016
Principal payoff amount	$ 953,000

X

- 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

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_GoldStarPlazaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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