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Mortgage Loans Payable and Unsecured Credit Facilities (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details) - Revolving Credit Facility [Member] | 12 Months Ended
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Dec. 31, 2021 Term
Debt Instrument [Line Items] |
Line of credit facility extension allowed period | 1 year
Line of credit facility extension allowed term | 2

X
- Definition Line of credit facility extension allowed period. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility extension allowed term. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:integerItemType
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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |