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Real Estate (Schedule Of Transactions Related To Properties Held For Sale/Conveyance) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Properties [Line Items]
Gain on sales	$ 6,413,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	$ 609,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes	$ 997,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Continuing Operations [Member]
Real Estate Properties [Line Items]
Sales price	52,975,000us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	3,541,000us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	4,367,000us-gaap_SalesOfRealEstate / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales	6,413,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	481,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	997,000us-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	12,450,000us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_FairviewPlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales	3,810,000us-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	10,700,000us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_CarbondalePlazaMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales	123,000us-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	9,850,000us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_VirginiaLittleCreekMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales	2,209,000us-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	3,500,000us-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	12,350,000us-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	4,125,000us-gaap_SalesOfRealEstate / us-gaap_RealEstatePropertiesAxis = cdr_StJamesSquareMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Gain on sales	$ 271,000us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes / us-gaap_RealEstatePropertiesAxis = cdr_StJamesSquareMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember

X

- 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

X

- 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

X

- Details

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

X

- 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

X

- Details

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