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Real Estate (Schedule Of Transactions Related To Properties Held For Sale/Conveyance) (Details) (Continuing Operations [Member], USD $) | 9 Months Ended | 0 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 Fairview Plaza [Member] | Sep. 30, 2014 Carbondale Plaza [Member] | Sep. 30, 2014 Virginia Little Creek [Member] | Sep. 30, 2014 Annie Land Plaza [Member] | Sep. 30, 2014 Smithfield Plaza [Member] | Oct. 21, 2014 Smithfield Plaza [Member] Subsequent Event [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Date Sold |  | May 27, 2014 | Jul. 18, 2014 | Aug. 22, 2014 | Sep. 26, 2014 | Oct. 21, 2014 |
Sales price | $ 36,500,000 | $ 12,450,000 | $ 10,700,000 | $ 9,850,000 | $ 3,500,000 |  | $ 12,400,000
Gain on sales, continuing operations | $ 6,142,000 | $ 3,810,000 | $ 123,000 | $ 2,209,000 |  |  |

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- Definition Gain on sales. + References No definition available. + Details
Name: | cdr_GainLossOnSaleOfLandParcel
Namespace Prefix: | cdr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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- 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