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Discontinued Operations (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 property | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 05, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Oct. 12, 2012 property | Jun. 30, 2014 | May 06, 2014 | May 27, 2014 | Nov. 14, 2013 | Feb. 28, 2011 property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of real estate | $ 102,124,000 us-gaap_ProceedsFromSaleOfRealEstate | $ 34,713,000 us-gaap_ProceedsFromSaleOfRealEstate | $ 34,858,000 us-gaap_ProceedsFromSaleOfRealEstate |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt obligations | 1,423,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 10,452,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |
Payments of mortgage loan payable | 177,094,000 us-gaap_RepaymentsOfSecuredDebt | 77,069,000 us-gaap_RepaymentsOfSecuredDebt | 79,637,000 us-gaap_RepaymentsOfSecuredDebt |  |  |  |  |  |  |  |  |
Number of properties | 59 us-gaap_NumberOfRealEstateProperties |  |  |  |  |  |  |  |  |  |  |
Increase in shareholders' equity |  | (1,552,000)cdr_AdjustmentsToAdditionalPaidInCapitalAcquisitionOfNoncontrollingInterest | (6,148,000)cdr_AdjustmentsToAdditionalPaidInCapitalAcquisitionOfNoncontrollingInterest |  |  |  |  |  |  |  |  |
Gain on sales | 7,963,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | 4,679,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  |  |
McCormick Place [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  | 2,700,000 cdr_MortgageLoansPayableAndAccruedInterestForConveyancePropertiesInProcess / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_McCormickPlaceMember |  |  |
Carrying value of property held for sale |  |  |  |  |  |  |  |  | 1,800,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_McCormickPlaceMember |  |  |
Gahanna Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  |  | 5,000,000 cdr_MortgageLoansPayableAndAccruedInterestForConveyancePropertiesInProcess / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_GahannaDiscountDrugMartPlazaMember |  |
Carrying value of property held for sale |  |  |  |  |  |  |  |  |  | 4,300,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_GahannaDiscountDrugMartPlazaMember |  |
Westlake Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  | 3,400,000 cdr_MortgageLoansPayableAndAccruedInterestForConveyancePropertiesInProcess / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_WestlakeDiscountDrugMartPlazaMember |  |  |  |  |  |  |  |
Net proceeds from sales of real estate |  |  |  | 2,100,000 us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_WestlakeDiscountDrugMartPlazaMember |  |  |  |  |  |  |  |
Gain on extinguishment of debt obligations |  |  |  |  | 1,300,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_WestlakeDiscountDrugMartPlazaMember |  |  |  |  |  |  |
Payments of mortgage loan payable |  |  |  | 2,100,000 us-gaap_RepaymentsOfSecuredDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_WestlakeDiscountDrugMartPlazaMember |  |  |  |  |  |  |  |
Roosevelt II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  |  |  | 13,900,000 cdr_MortgageLoansPayableAndAccruedInterestForConveyancePropertiesInProcess / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_RooseveltIIMember |
Carrying value of property held for sale |  |  |  |  |  |  |  |  |  |  | 4,700,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_RooseveltIIMember |
Gain on extinguishment of debt obligations |  |  |  |  |  | 9,200,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_RooseveltIIMember |  |  |  |  |  |
Homburg Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  |  |  |  |  |  |  |  |  |  |  | 9 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember
Meadows Marketplace And Fieldstone Marketplace [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired |  |  |  |  |  |  | 2 cdr_NumberOfPropertiesAcquired / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |
Acquired ownership percentage in joint venture |  |  | 80.00%cdr_JointVentureAcquiredOwnershipPercentage / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  | 27,300,000 cdr_PurchasePriceOfAcquiredProperty / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |  |  |  |  |
Assumption of mortgage financing related to the exchange agreement |  |  | 21,800,000 cdr_EquityMethodInvestmentAssumedMortgageFinancing / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |  |  |  |  |
Property ownership percentage |  |  |  |  |  |  | 100.00%cdr_PropertyOwnershipPercentage / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |
Increase in shareholders' equity |  |  | 7,600,000 cdr_AdjustmentsToAdditionalPaidInCapitalAcquisitionOfNoncontrollingInterest / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_MeadowsMarketplaceAndFieldstoneMarketplaceMember |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales price | 74,761,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 46,393,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 51,163,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Gain on sales | 7,963,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | 4,679,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | McCormick Place [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt obligations |  |  |  |  |  |  |  | 800,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_McCormickPlaceMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |
Sales price | 2,679,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_McCormickPlaceMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Gahanna Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt obligations |  |  |  |  |  |  |  | 600,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_GahannaDiscountDrugMartPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |
Sales price | 4,982,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_GahannaDiscountDrugMartPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Harbor Square (f/k/a Shore Mall) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales price | 25,000,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HarborSquareMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Westlake Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  | 2,240,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_WestlakeDiscountDrugMartPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Roosevelt II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales price |  | 13,878,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_RooseveltIIMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Homburg Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of properties |  |  | 7 us-gaap_NumberOfRealEstateProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Number of properties sold |  |  | 7 cdr_NumberOfPropertiesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Property ownership percentage sold |  |  | 20.00%cdr_PropertyOwnershipPercentageSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Sales price |  |  | 23,642,000 us-gaap_SalesOfRealEstate / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Mortgage financing transferred |  |  | 14,500,000 cdr_EquityMethodInvestmentMortgageFinancingTransferred / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |
Gain on sales |  |  | $ 3,929,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cdr_HomburgJointVentureMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |

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