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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |
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Dec. 31, 2014 property | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 23, 2015 | May 30, 2013 item | Oct. 31, 2013 | Oct. 31, 2013 | Oct. 09, 2012
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of properties | 59 us-gaap_NumberOfRealEstateProperties |  |  |  |  |  |  |
Purchase price of acquired property | $ 38,861,000 us-gaap_PaymentsToAcquireRealEstate | $ 32,818,000 us-gaap_PaymentsToAcquireRealEstate |  |  |  |  |  |
Depreciation expense | 35,000,000 us-gaap_Depreciation | 41,100,000 us-gaap_Depreciation | 40,000,000 us-gaap_Depreciation |  |  |  |  |
Cash at consolidated joint ventures | 800,000 cdr_CashAtConsolidatedJointVentures | 1,500,000 cdr_CashAtConsolidatedJointVentures |  |  |  |  |  |
Allowance for doubtful accounts receivable | 4,300,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 5,100,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |  |  |
Provision for doubtful accounts included in operating, maintenance and management expenses | 1,900,000 cdr_ProvisionForDoubtfulAccountsReceivableIncludedInOperatingMaintenanceAndManagementExpenses | 1,800,000 cdr_ProvisionForDoubtfulAccountsReceivableIncludedInOperatingMaintenanceAndManagementExpenses | 1,900,000 cdr_ProvisionForDoubtfulAccountsReceivableIncludedInOperatingMaintenanceAndManagementExpenses |  |  |  |  |
2012 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares may be issued under the plan | 4,500,000 us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance / us-gaap_PlanNameAxis = cdr_TwoThousandTwelveStockIncentivePlanMember |  |  |  |  |  |  |
Maximum number of shares to be granted per year to a participant | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = cdr_TwoThousandTwelveStockIncentivePlanMember |  |  |  |  |  |  |
General Partner [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |  |  |  |
New London Joint Venture [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Acquired ownership percentage in joint venture |  |  |  | 60.00%cdr_JointVentureAcquiredOwnershipPercentage / dei_LegalEntityAxis = cdr_NewLondonJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
RioCan Real Estate Investment Trust [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = cdr_RiocanRealEstateInvestmentTrustMember
Homburg Joint Venture [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = cdr_HomburgJointVentureMember |  |  |  |  |  |  |
Number of properties | 9 us-gaap_NumberOfRealEstateProperties / dei_LegalEntityAxis = cdr_HomburgJointVentureMember |  |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] | Other Ownership Interest [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_OtherOwnershipInterestMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |
VIE real estate owned carrying value | 40,500,000 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_OtherOwnershipInterestMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |
VIE mortgage payable | 0 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_OtherOwnershipInterestMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Real estate investments useful life | 3 years |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Real estate investments useful life | 40 years |  |  |  |  |  |  |
New London Mall And San Souci Plaza [Member] | General Partner [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallAndSanSouciPlazaMember |  |  |  |  |  |  |
New London Mall [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Purchase price of acquired property |  |  |  | 27,300,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Amount of purchase price paid in cash |  |  |  | 10,900,000 cdr_PaymentsToAcquireRealEstateCashPaid / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Amount of purchase price representing 60% share of in-place mortgage financing |  |  |  | 16,400,000 cdr_PaymentsToAcquireRealEstateAmountRepresentingInPlaceMortgageFinancing / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Percentage of share of in-place mortgage financing |  |  |  | 60.00%cdr_PercentageOfShareOfInPlaceMortgageFinancing / us-gaap_RealEstatePropertiesAxis = cdr_NewLondonMallMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Heritage Crossings And Upland Square Projects [Member] | Other Ownership Interest [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of joint ventures |  |  |  |  | 2 cdr_NumberOfJointVentures / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_OtherOwnershipInterestMember / us-gaap_RealEstatePropertiesAxis = cdr_HeritageCrossingsAndUplandSquareProjectsMember |  |  |
Joint venture ownership percentage |  |  |  |  | 60.00%cdr_JointVentureOwnershipPercentage / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_OtherOwnershipInterestMember / us-gaap_RealEstatePropertiesAxis = cdr_HeritageCrossingsAndUplandSquareProjectsMember |  |  |
Upland Square [Member] |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_UplandSquareMember |  |  |  |  |  |  |
Acquired ownership percentage in joint venture |  |  |  |  |  | 40.00%cdr_JointVentureAcquiredOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_UplandSquareMember | 40.00%cdr_JointVentureAcquiredOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = cdr_UplandSquareMember |
Investments in and advances to unconsolidated joint ventures |  |  |  |  |  | $ 1,600,000 us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_RealEstatePropertiesAxis = cdr_UplandSquareMember |  |

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