Area of commercial building.

No definition available.

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- Definition

Area of commercial space leased percentage.

+ References

No definition available.

+ Details

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- Definition

Development cost sold to Joint Venture.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Impairment of long lived assets held for sale.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Impairment reversal charges of real estate.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Real Estate Ownership Percentage.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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)
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-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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase (decrease) in cash associated with the entity's discontinued operations.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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Balance Type:	credit
Period Type:	duration

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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Balance Type:	debit
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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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Period Type:	duration

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Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cdr_OfficeSpaceMember
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Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cdr_StreetLevelRetailMember
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Real Estate (Narrative) (Details)					12 Months Ended			15 Months Ended
Real Estate (Narrative) (Details)	Jul. 07, 2022 USD ($)	Jun. 28, 2022 USD ($)	Oct. 14, 2021 USD ($)	May 05, 2021 USD ($) ft²	Dec. 31, 2022 USD ($) Property	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 05, 2022 USD ($)
Real Estate Properties [Line Items]
Impairment charges					$ 9,350,000	$ 65,975,000	$ 7,607,000
Contributed capital to joint venture					155,000	4,654,000		$ 4,800,000
Net cash provided by operations from discontinued operations					25,900,000	48,300,000	39,700,000
Net cash provided by (used in) investing activities from discontinued operations					651,500,000	(21,200,000)	(23,400,000)
Investment in Unconsolidated Joint Venture [Member]
Real Estate Properties [Line Items]
Area of commercial building \| ft²				258,000
Area of commercial space leased percentage				100.00%
Term of lease				20 years 10 months
Development cost sold to Joint Venture				$ 8,000,000.0
Investment in Unconsolidated Joint Venture [Member] \| Office Space [Member]
Real Estate Properties [Line Items]
Area of commercial building \| ft²				240,000
Investment in Unconsolidated Joint Venture [Member] \| Street-Level Retail [Member]
Real Estate Properties [Line Items]
Area of commercial building \| ft²				18,000
Investment in Unconsolidated Joint Venture [Member]
Real Estate Properties [Line Items]
Impairment charges					$ 9,400,000
Dual-track Strategic Alternatives Process [Member]
Real Estate Properties [Line Items]
Impairment charges						58,500,000
Impairment charges, assets held for sale						9,300,000
Patuxent Crossing [Member]
Real Estate Properties [Line Items]
Minority ownership			60.00%
Purchase price			$ 300,000
Metro Square [Member]
Real Estate Properties [Line Items]
Impairment charges							7,200,000
Real Estate Held for Sale [Member]
Real Estate Properties [Line Items]
Number of properties \| Property					0
Impairment charges, assets held for sale							$ 400,000
Reversal of impairment charges						$ 1,800,000
Crossroads II [Member]
Real Estate Properties [Line Items]
Minority ownership		40.00%
Purchase price		$ 1,000,000.0
Discontinued Operations [Member]
Real Estate Properties [Line Items]
Gross proceeds from sale of real estate	$ 879,000,000
Discontinued Operations [Member] \| Grocery-Anchored Shopping Center [Member]
Real Estate Properties [Line Items]
Number of properties \| Property					33