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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loan Activity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Mortgage Loans Payable And Unsecured Credit Facilities [Abstract]
Balance, beginning of year	$ 393,388,000	$ 516,292,000
Mortgages on properties held for sale		(15,249,000)
Mortgage loan assumptions	20,462,000	53,439,000
Repayments	(114,828,000)	(161,094,000)
Balance, end of the year	$ 299,022,000	$ 393,388,000

X

- Definition

Mortgage Loan Assumptions

+ References

No definition available.

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Balance Type:	debit
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- Definition

Mortgages On Properties Held For Sale

+ References

No definition available.

+ Details

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Namespace Prefix:	cdr_
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- References

No definition available.

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Balance Type:	na
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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.

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- 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 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

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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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