Derivative maturity year.

No definition available.

Name:	cdr_DerivativeMaturityYear
Namespace Prefix:	cdr_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- 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_DerivativesFairValueLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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- Details

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Namespace Prefix:
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Mortgage Loans Payable and Unsecured Credit Facilities (Summary of Derivative Financial Instruments Held) (Details) - Interest Rate Swap [Member]	12 Months Ended
	Dec. 31, 2021 USD ($) contract	Dec. 31, 2020 USD ($) contract
Cash Flow Hedging, Count 5 [Member]
Derivatives Fair Value [Line Items]
Count \| contract	5
Fair value \| $	$ 8,232,000
Cash Flow Hedging, Count 5 [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2023
Cash Flow Hedging, Count 5 [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates	2025
Cash Flow Hedging, Count 7 [Member]
Derivatives Fair Value [Line Items]
Count \| contract		7
Fair value \| $		$ 18,927,000
Cash Flow Hedging, Count 7 [Member] \| Minimum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2021
Cash Flow Hedging, Count 7 [Member] \| Maximum [Member]
Derivatives Fair Value [Line Items]
Maturity dates		2025