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Discontinued Operations (Narrative) (Details) (Discontinued Operations [Member], Huntingdon Plaza [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Feb. 02, 2015
Discontinued Operations [Member] | Huntingdon Plaza [Member]
 
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Sales price $ 2.2us-gaap_SalesOfRealEstate
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= cdr_HuntingdonPlazaMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember