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Investment In Cedar/RioCan Joint Venture (Narrative) (Details) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Oct. 10, 2012	Dec. 31, 2014 property	Oct. 09, 2012 property
Schedule of Equity Method Investments [Line Items]
Number of properties				59us-gaap_NumberOfRealEstateProperties
Gain on exit from unconsolidated joint ventures	$ 30,526,000cdr_GainLossOnExitFromUnconsolidatedJointVentures
Cedar/Rio Can Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of joint venture ownership					20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_CedarRioCanJointVentureMember
Number of properties					22us-gaap_NumberOfRealEstateProperties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_CedarRioCanJointVentureMember
Management fee revenue	2,800,000us-gaap_ManagementFeesRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_CedarRioCanJointVentureMember	200,000us-gaap_ManagementFeesRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_CedarRioCanJointVentureMember
Rio Can [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of joint venture ownership					80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cdr_RioCanMember
Franklin Village Plaza [Member]
Schedule of Equity Method Investments [Line Items]
Property ownership percentage			100.00%cdr_PropertyOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_FranklinVillagePlazaMember
Purchase price of acquired property			75,100,000cdr_PurchasePriceOfAcquiredProperty / us-gaap_RealEstatePropertiesAxis = cdr_FranklinVillagePlazaMember
Assumption of mortgage financing related to the exchange agreement			43,100,000cdr_EquityMethodInvestmentAssumedMortgageFinancing / us-gaap_RealEstatePropertiesAxis = cdr_FranklinVillagePlazaMember
Cash received in the exchange transaction			$ 41,600,000cdr_CashReceivedInExchangeOfJointVentureInterest / us-gaap_RealEstatePropertiesAxis = cdr_FranklinVillagePlazaMember

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- Definition

Gain (Loss) On Exit From Unconsolidated Joint Ventures

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Property Ownership Percentage

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

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