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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loan Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mortgage Loans Payable And Unsecured Credit Facilities [Abstract]
Balance, beginning of year	$ 516,292,000us-gaap_SecuredDebt	$ 589,168,000us-gaap_SecuredDebt
Mortgages on properties held for sale	(15,249,000)cdr_MortgagesOnPropertiesHeldForSale
Mortgage loan assumptions	53,439,000cdr_MortgageLoanAssumptions
Repayments	(161,094,000)us-gaap_RepaymentsOfDebt	(72,876,000)us-gaap_RepaymentsOfDebt
Balance, end of the year	$ 393,388,000us-gaap_SecuredDebt	$ 516,292,000us-gaap_SecuredDebt

X

- Definition

Mortgage Loan Assumptions

+ References

No definition available.

+ Details

Name:	cdr_MortgageLoanAssumptions
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Mortgages On Properties Held For Sale

+ References

No definition available.

+ Details

Name:	cdr_MortgagesOnPropertiesHeldForSale
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DebtDisclosureAbstract
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

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_SecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant