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Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value Measurements [Abstract]
Fair value of fixed rate mortgage loans payable	$ 519.2	$ 565.4
Carrying value of fixed rate mortgage payable	$ 499.3	$ 544.8

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- Definition

Fixed Rate Mortgage Loans Payable Fair Value

+ References

No definition available.

+ Details

Name:	cdr_FixedRateMortgageLoansPayableFairValue
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fixed Rate Mortgage Payable Carrying Value

+ References

No definition available.

+ Details

Name:	cdr_FixedRateMortgagePayableCarryingValue
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration