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Receivables (Parenthetical) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Net receivables related to deferred rent	$ 1.9

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- Definition

Net receivables related to deferred rent.

+ References

No definition available.

+ Details

Name:	cdr_NetReceivablesRelatedToDeferredRent
Namespace Prefix:	cdr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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