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Discontinued Operations (Schedule Of Properties Sold, Classified As Discontinued Operations) (Details) - USD ($)
 12 Months Ended
Feb. 02, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sales Price   $ 4,075,000 $ 52,975,000  
Gain on sales     7,963,000  
Discontinued Operations [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sales Price     74,761,000 $ 46,393,000
Gain on sales     $ 7,963,000  
Discontinued Operations [Member] | East Chestnut [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Jan. 02, 2013
Sales Price       $ 3,100,000
Discontinued Operations [Member] | Columbia Mall [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Apr. 17, 2013
Sales Price       $ 2,775,000
Discontinued Operations [Member] | Heritage Crossings [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       May 09, 2013
Sales Price       $ 9,400,000
Discontinued Operations [Member] | Westlake Discount Drug Mart Plaza [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Jun. 05, 2013
Sales Price       $ 2,240,000
Discontinued Operations [Member] | Dunmore Shopping Center [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Nov. 08, 2013
Sales Price       $ 4,000,000
Discontinued Operations [Member] | Roosevelt II [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Nov. 14, 2013
Sales Price [1]       $ 13,878,000
Discontinued Operations [Member] | Oakhurst Plaza [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold       Dec. 11, 2013
Sales Price       $ 11,000,000
Discontinued Operations [Member] | Huntingdon Plaza [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sales Price $ 2,200,000      
Discontinued Operations [Member] | Harbor Square (f/k/a Shore Mall) [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold     Feb. 25, 2014  
Sales Price     $ 25,000,000  
Discontinued Operations [Member] | McCormick Place [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold     May 06, 2014  
Sales Price [1]     $ 2,679,000  
Discontinued Operations [Member] | Gahanna Discount Drug Mart Plaza [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold     May 27, 2014  
Sales Price [1]     $ 4,982,000  
Discontinued Operations [Member] | Townfair Center [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold     May 29, 2014  
Sales Price     $ 22,600,000  
Gain on sales     $ 1,472,000  
Discontinued Operations [Member] | Lake Raystown Plaza [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date Sold     Jun. 25, 2014  
Sales Price     $ 19,500,000  
Gain on sales     $ 6,491,000  
[1] Lender accepted a deed-in-lieu of foreclosure on the property. Sales price represents mortgage loan payable, accrued interest and other expenses forgiven upon title transfer.