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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 | 295,000 us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember | 4,484,000 us-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 | 57,839,000 us-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 | 7,188,000 us-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 | 11,045,000 us-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 | 8,171,000 us-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 | 19,479,000 us-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 | 18,726,000 us-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 | 11,217,000 us-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 | 16,878,000 us-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 | 8,215,000 us-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 | 6,616,000 us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_SmithfieldPlazaMember | 3,200,000 us-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 | 3,638,000 us-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 |  | 1,538,000 us-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 |  | 8,633,000 us-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 |  | 5,384,000 us-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 |  | 4,960,000 us-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 |  | 5,592,000 us-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 |  | 4,185,000 us-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 |  | 4,721,000 us-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 |  | 13,690,000 us-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 |  | $ 7,610,000 us-gaap_RepaymentsOfDebt / us-gaap_RealEstatePropertiesAxis = cdr_TimpanyPlazaMember

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 + Details
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