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Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details)	6 Months Ended
	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: