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Share-Based Compensation (Schedule Of Share-Based Compensation Information) (Parenthetical) (Details) | 9 Months Ended
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Sep. 30, 2017 USD ($)
Share Based Compensation [Abstract] |
Expense reduction related to forfeiture of restricted shares | $ 267,000

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- Definition Share-based compensation arrangement by share-based payment award, net of expense reduction related to forfeiture. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration