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Properties Held For Sale and Related Transactions (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2011
Dec. 31, 2012
property
Dec. 31, 2012
property
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Other Properties [Member]
Dec. 31, 2012
Homburg Joint Venture Properties [Member]
Dec. 31, 2011
Homburg Joint Venture Properties [Member]
Dec. 31, 2011
Discount Drug Mart Portfolio [Member]
Dec. 31, 2010
Discount Drug Mart Portfolio [Member]
Dec. 31, 2011
Malls [Member]
Dec. 31, 2010
Malls [Member]
Dec. 31, 2011
Single Tenant/Triple-Net-Lease Properties [Member]
Dec. 31, 2010
Single Tenant/Triple-Net-Lease Properties [Member]
Dec. 31, 2011
Development Projects And Other Non-Core Properties [Member]
Dec. 31, 2010
Development Projects And Other Non-Core Properties [Member]
Jan. 31, 2013
East Chestnut [Member]
Dec. 31, 2012
Philadelphia Redevelopment Property [Member]
Dec. 31, 2011
Ohio Properties [Member]
Dec. 31, 2012
Properties Held For Sale/Conveyance [Member]
property
Dec. 31, 2011
Properties Held For Sale/Conveyance [Member]
Ohio Properties [Member]
property
Dec. 31, 2012
Meadows Marketplace And Fieldstone Marketplace [Member]
Apr. 30, 2011
Unconsolidated Properties [Member]
Dec. 31, 2011
Wholly Owned Properties [Member]
Apr. 30, 2011
Wholly Owned Properties [Member]
Dec. 31, 2012
HII Joint Venture [Member]
property
Oct. 31, 2011
HII Joint Venture [Member]
property
Oct. 31, 2011
HII Joint Venture [Member]
Meadows Marketplace And Fieldstone Marketplace [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                        
Loan to developers $ 4,100,000                                                      
Interest rate on loan to developers 6.25%                                                      
Impairment charge of mortgage loan receivable   4,400,000   4,300,000                                                
Sale price of property sold                                 3,100,000                 23,600,000    
Impairment (charges)/reversals     4,000 [1] 88,458,000 [1] 39,822,000 [1] 2,400,000 (2,400,000) 2,400,000 11,100,000 26,800,000 33,100,000 12,600,000 5,300,000 100,000 36,600,000 300,000     10,500,000         9,100,000        
Number of properties   67 67                                 10 12           9  
Property ownership percentage                                           100.00%         20.00% 80.00%
Number of properties in process of conveying     4                                                  
Number of properties acquired                                                     2  
Number of properties sold                                                   7    
Purchase price of acquired property                                           27,300,000            
Assumption of mortgage financing related to the exchange agreement                                           21,800,000            
Increase in shareholders' equity     (6,148,000)                                                  
Mortgage financing transferred                                                   14,500,000    
Estimated gain that would be recognized at the time of conveyances     11,000,000                             8,100,000                    
Aggregate loan balance and accrued interest     23,700,000                                                  
Guaranteed loan amount                                               250,000        
Non-recourse mortgage                                             14,700,000   12,900,000      
Loss on exit from unconsolidated joint venture     $ 30,526,000 $ (7,961,000)                                                
[1] Included in discontinued operations in the accompanying statements of operations.