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Share-Based Compensation (Summary Of Information Relating To Performance-Based Grants) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Performance-Based Awards Disclosure [Line Items] |  |
Grant year | 2011 | 2010
Shares granted | 275,000 | 227,000
Grant date market price | $ 6.54 | $ 6.70
Absolute TSR [Member] |  |
Performance-Based Awards Disclosure [Line Items] |  |
Portion of grant | 50.00% | 50.00%
Annual average return | 8.00% | 6.00%
Appraisal value | $ 4.40 | $ 4.56
Relative TSR [Member] |  |
Performance-Based Awards Disclosure [Line Items] |  |
Portion of grant | 50.00% | 50.00%
Appraisal value | $ 5.91 | $ 6.00

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- Definition Performance-Based Awards, Awards Granted, Grant Date Market Price + References No definition available. + Details
Name: | cdr_PerformanceBasedAwardsAwardsGrantedGrantDateMarketPrice
Namespace Prefix: | cdr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cdr_PerformanceBasedAwardsDisclosureLineItems
Namespace Prefix: | cdr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Performance-Based Awards, Number Of Awards Granted During Period + References No definition available. + Details
Name: | cdr_PerformanceBasedAwardsNumberOfAwardsGrantedDuringPeriod
Namespace Prefix: | cdr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Performance-Based Awards, Year Of Grant + References No definition available. + Details
Name: | cdr_PerformanceBasedAwardsYearOfGrant
Namespace Prefix: | cdr_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Shareholder Return, Annual Average Return + References No definition available. + Details
Name: | cdr_TotalShareholderReturnAnnualAverageReturn
Namespace Prefix: | cdr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Shareholder Return, Appraisal Value + References No definition available. + Details
Name: | cdr_TotalShareholderReturnAppraisalValue
Namespace Prefix: | cdr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Shareholder Return, Portion Of Grant + References No definition available. + Details
Name: | cdr_TotalShareholderReturnPortionOfGrant
Namespace Prefix: | cdr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration