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v3.20.2

Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details) | 6 Months Ended
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Jun. 30, 2020
Unsecured Credit Facility [Member] |
Debt Instrument [Line Items] |
Expected increase in weighted average interest rate subject to increase in leverage ratio | 0.15%
Revolving Credit Facility [Member] |
Debt Instrument [Line Items] |
Line of credit facility extension allowed period | 1 year

X
- Definition Expected increase in weighted average interest rate subject to increase in leverage ratio. + References No definition available. + Details
Name: | cdr_ExpectedIncreaseInWeightedAverageInterestRateSubjectToIncreaseInLeverageRatio
Namespace Prefix: | cdr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- 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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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