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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Fair Value Measurements [Abstract] |  |
Fair value of fixed rate mortgage loans payable | $ 514.2 | $ 528.5
Carrying value of fixed rate mortgage payable | $ 496.9 | $ 524.7

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- Definition Fixed Rate Mortgage Loans Payable Fair Value + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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