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Fair Value Measurements (Quantitative Information Regarding Level 3 Assets Measured At Fair Value On Non-recurring Basis) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Real estate held for sale/conveyance | $ 70,757,000 us-gaap_AssetsHeldForSaleAtCarryingValue | $ 16,508,000 us-gaap_AssetsHeldForSaleAtCarryingValue
Number of properties |  | 59 us-gaap_NumberOfRealEstateProperties
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Real estate held for sale/conveyance | 70,757,000 us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 13,084,000 us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Sales Comparison Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Price per acre | 35,000 cdr_FairValueInputsPricePerAcre / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |
Operating retail real estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Number of properties | 6 us-gaap_NumberOfRealEstateProperties / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Operating retail real estate [Member] | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Real estate held for sale/conveyance | 70,210,000 us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember | 13,084,000 us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Capitalization rates |  | 8.30%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Discount rates |  | 9.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Operating retail real estate [Member] | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Capitalization rates | 7.80%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Discount rates | 9.20%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Operating retail real estate [Member] | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Capitalization rates | 11.00%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Discount rates | 11.60%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Operating retail real estate [Member] | Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Capitalization rates | 8.20%us-gaap_FairValueInputsCapRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Discount rates | 9.40%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = us-gaap_RetailSiteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_WeightedAverageMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |
Land [Member] | Fair Value, Inputs, Level 3 [Member] | Sales Comparison Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Real estate held for sale/conveyance | $ 547,000 us-gaap_AssetsHeldForSaleAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_LandMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_MarketApproachValuationTechniqueMember |

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- Definition Fair Value Inputs Price Per Acre + References No definition available. + Details
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- Definition Represents the sum of the carrying value of all the Assets Held-for-Sale at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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