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Real Estate (Schedule Of Transactions Related To Properties Held For Sale/Conveyance) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Real Estate Properties [Line Items] |  |  |
Gain on sales | $ 6,413,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes | $ 609,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes | $ 997,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Continuing Operations [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Sales price | 52,975,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 3,541,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 4,367,000 us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales | 6,413,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 481,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 997,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Continuing Operations [Member] | Fairview Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | May 27, 2014 |  |
Sales price | 12,450,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_FairviewPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Gain on sales | 3,810,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstatePropertiesAxis = cdr_FairviewPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Continuing Operations [Member] | Carbondale Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Jul. 18, 2014 |  |
Sales price | 10,700,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_CarbondalePlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Gain on sales | 123,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstatePropertiesAxis = cdr_CarbondalePlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Continuing Operations [Member] | Virginia Little Creek [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Aug. 22, 2014 |  |
Sales price | 9,850,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Gain on sales | 2,209,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Continuing Operations [Member] | Annie Land Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Sep. 26, 2014 |  |
Sales price | 3,500,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_AnnieLandPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Continuing Operations [Member] | Smithfield Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Oct. 21, 2014 |  |
Sales price | 12,350,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_SmithfieldPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Continuing Operations [Member] | St. James Square [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Date Sold | Nov. 05, 2014 |  |
Sales price | 4,125,000 us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_StJamesSquareMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |
Gain on sales | $ 271,000 us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstatePropertiesAxis = cdr_StJamesSquareMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |

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- Definition Property Held For Sale Date Sold + References No definition available. + Details
Name: | cdr_PropertyHeldForSaleDateSold
Namespace Prefix: | cdr_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Paragraph a -Subparagraph 1(ii) -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
Name: | us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References 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(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentContinuingOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |