Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures $ (1,750) $ 600
Plaza VIII & IX Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures 9 10
South Pier At Harborside [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (511) 12
Red Bank Corporate Plaza, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures 101 103
12 Vreeland Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (92) 199
Boston Downtown Crossing [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (5) (100)
Gale Jefferson, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures 68 20
Stamford SM LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures 885 356
Marbella RoseGarden, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (111)  
RoseGarden Monaco Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (399)  
Rosewood Lafayette Holdings, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (290)  
PruRose Port Imperial South 15, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (606)  
Rosewood Morristown, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (124)  
Overlook Ridge JV 2C/3B, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (73)  
Roseland/North Retail, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (49)  
BNES Associates III [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (69)  
Portside Master Company, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (45)  
PruRose Port Imperial South 13, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (133)  
RoseGarden Marbella South, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (18)  
PruRose Riverwalk G, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (186)  
Elmajo Urban Renewal Associates, L.L.C. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (115)  
Crystal House Apartments Investors LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures $ 13