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Earnings Per Share (Narrative) (Details) - shares | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Weighted average nonvested restricted shares outstanding | 500,000 | 500,000
Weighted average number of OP units outstanding | 81,000 | 81,000
Market Performance-Based Equity Award [Member] | Chief Executive Officer [Member] |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Shares issuable under Stock incentive plan | 0 | 0

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options issuable during period. + References No definition available. + Details
Name: | cdr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuableDuringPeriod
Namespace Prefix: | cdr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average number of operating partnership units outstanding. + References No definition available. + Details
Name: | cdr_WeightedAverageNumberOfOperatingPartnershipUnitsOutstanding
Namespace Prefix: | cdr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 68B -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5498026-109256 + Details
Name: | us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=cdr_MarketPerformanceBasedEquityAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |