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Mortgage Loans Payable And Unsecured Credit Facilities (Schedule Of Mortgage Loans Payable Repaid) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Principal Payoff Amount	$ (161,094,000)us-gaap_RepaymentsOfDebt	$ (72,876,000)us-gaap_RepaymentsOfDebt
Virginia Little Creek [Member]
Debt Instrument [Line Items]
Repayment Date	Feb. 03, 2014	Feb. 01, 2013
Mortgage maturity date	Sep. 01, 2021	Aug. 01, 2013
Principal Payoff Amount	295,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember	4,484,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember
Upland Square [Member]
Debt Instrument [Line Items]
Repayment Date	Feb. 11, 2014
Mortgage maturity date	Oct. 26, 2014
Principal Payoff Amount	57,839,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_UplandSquareMember
Kings Plaza [Member]
Debt Instrument [Line Items]
Repayment Date	Apr. 01, 2014
Mortgage maturity date	Jul. 01, 2014
Principal Payoff Amount	7,188,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_KingsPlazaMember
Coliseum Marketplace [Member]
Debt Instrument [Line Items]
Repayment Date	Apr. 01, 2014
Mortgage maturity date	Jul. 01, 2014
Principal Payoff Amount	11,045,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_ColiseumMarketplaceMember
Liberty Marketplace [Member]
Debt Instrument [Line Items]
Repayment Date	Apr. 01, 2014
Mortgage maturity date	Jul. 01, 2014
Principal Payoff Amount	8,171,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_LibertyMarketplaceMember
Trexler Mall [Member]
Debt Instrument [Line Items]
Repayment Date	May 11, 2014
Mortgage maturity date	May 11, 2014
Principal Payoff Amount	19,479,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_TrexlerMallMember
Yorktowne Plaza [Member]
Debt Instrument [Line Items]
Repayment Date	Jun. 02, 2014
Mortgage maturity date	Jul. 01, 2014
Principal Payoff Amount	18,726,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_YorktownePlazaMember
Quartermaster Plaza [Member]
Debt Instrument [Line Items]
Repayment Date	Jun. 05, 2014
Mortgage maturity date	Oct. 01, 2014
Principal Payoff Amount	11,217,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_QuartermasterPlazaMember
Fieldstone Marketplace [Member]
Debt Instrument [Line Items]
Repayment Date	Jul. 11, 2014
Mortgage maturity date	Jul. 11, 2014
Principal Payoff Amount	16,878,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_FieldstoneMarketplaceMember
Mechanicsburg Center [Member]
Debt Instrument [Line Items]
Repayment Date	Aug. 01, 2014
Mortgage maturity date	Nov. 01, 2014
Principal Payoff Amount	8,215,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_MechanicsburgCenterMember
Smithfield Plaza [Member]
Debt Instrument [Line Items]
Repayment Date	Oct. 21, 2014	Feb. 01, 2013
Mortgage maturity date	May 11, 2016	Aug. 01, 2013
Principal Payoff Amount	6,616,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_SmithfieldPlazaMember	3,200,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_SmithfieldPlazaMember
Elmhurst Square [Member]
Debt Instrument [Line Items]
Repayment Date	Dec. 11, 2014
Mortgage maturity date	Dec. 11, 2014
Principal Payoff Amount	3,638,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_ElmhurstSquareMember
East Chestnut [Member]
Debt Instrument [Line Items]
Repayment Date		Jan. 02, 2013
Mortgage maturity date		Apr. 01, 2018
Principal Payoff Amount		1,538,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_EastChestnutMember
Academy Plaza [Member]
Debt Instrument [Line Items]
Repayment Date		Jan. 10, 2013
Mortgage maturity date		Mar. 10, 2013
Principal Payoff Amount		8,633,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_AcademyPlazaMember
Fort Washington Center [Member]
Debt Instrument [Line Items]
Repayment Date		Jan. 29, 2013
Mortgage maturity date		Jan. 29, 2013
Principal Payoff Amount		5,384,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_FortWashingtonMember
General Booth Plaza [Member]
Debt Instrument [Line Items]
Repayment Date		Feb. 01, 2013
Mortgage maturity date		Aug. 01, 2013
Principal Payoff Amount		4,960,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_GeneralBoothPlazaMember
Kempsville Crossing [Member]
Debt Instrument [Line Items]
Repayment Date		Feb. 01, 2013
Mortgage maturity date		Aug. 01, 2013
Principal Payoff Amount		5,592,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_KempsvilleCrossingMember
Suffolk Plaza [Member]
Debt Instrument [Line Items]
Repayment Date		Feb. 01, 2013
Mortgage maturity date		Aug. 01, 2013
Principal Payoff Amount		4,185,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_SuffolkPlazaMember
Carbondale Plaza [Member]
Debt Instrument [Line Items]
Repayment Date		Jun. 17, 2013
Mortgage maturity date		May 01, 2015
Principal Payoff Amount		4,721,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_CarbondalePlazaMember
Port Richmond Village [Member]
Debt Instrument [Line Items]
Repayment Date		Jul. 30, 2013
Mortgage maturity date		Aug. 01, 2013
Principal Payoff Amount		13,690,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_PortRichmondVillageMember
Timpany Plaza [Member]
Debt Instrument [Line Items]
Repayment Date		Nov. 01, 2013
Mortgage maturity date		Jan. 01, 2014
Principal Payoff Amount		$ 7,610,000us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_TimpanyPlazaMember

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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