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Real Estate (Schedule of Property Disposition not Including Grocery-Anchored Portfolio Sale) (Details) - Riverview Plaza [Member] - Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 9 Months Ended
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Sep. 30, 2022 USD ($) ft²
Real Estate Properties [Line Items] |
Location | Philadelphia, PA
GLA | ft² | 108,902
Date Sold | May 16, 2022
Sales Price | $ 34,000,000
Impairment | $ (361,000)

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- Definition Property held for sale date sold. + References No definition available. + Details
Name: | cdr_PropertyHeldForSaleDateSold
Namespace Prefix: | cdr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Real estate dispositions sales price. + References No definition available. + Details
Name: | cdr_RealEstateDispositionsSalesPrice
Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Real estate sold properties location. + References No definition available. + Details
Name: | cdr_RealEstateSoldPropertiesLocation
Namespace Prefix: | cdr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |