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Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Accounting Policies [Abstract] |
Lease rent deferred | $ 3.5
Lease rent deferrals continued to recognize rental income | 2.4
Lease rent waived | $ 2.4

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- Definition Lease rent deferrals continued to recognize rental income. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease rent deferred. + References No definition available. + Details
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X
- Definition Lease rent waived. + References No definition available. + Details
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Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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