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Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2020 USD ($)
Accounting Policies [Abstract]
Lease rent deferred	$ 2.0
Lease rent deferrals continued to recognize rental income	1.8
Lease rent waived	$ 0.4

X

- Definition

Lease rent deferrals continued to recognize rental income.

+ References

No definition available.

+ Details

Name:	cdr_LeaseRentDeferralsContinuedToRecognizeRentalIncome
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lease rent deferred.

+ References

No definition available.

+ Details

Name:	cdr_LeaseRentDeferred
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lease rent waived.

+ References

No definition available.

+ Details

Name:	cdr_LeaseRentWaived
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration