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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (229) $ 2,418 $ (2,059) $ 4,751
Plaza VIII & IX Associates, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 24 21 52 43
South Pier At Harborside [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 835 1,080 1,380 1,884
Red Bank Corporate Plaza, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 99 94 306 298
12 Vreeland Associates, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (25) 279 (1) 603
Boston Downtown Crossing [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   (6) 646 (333)
Gale Jefferson, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   23 68 63
Stamford SM LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 1,023 927 2,805 2,193
Marbella RoseGarden, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (170)   (446)  
RoseGarden Monaco Holdings, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (416)   (1,238)  
Rosewood Lafayette Holdings, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (295)   (869)  
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 (152)   (393)  
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 53   204  
Roseland/North Retail, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (62)   (194)  
BNES Associates III [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (37)   (108)  
Portside Master Company, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (109)   (222)  
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 (181)   (459)  
RoseGarden Marbella South, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (20)   (57)  
PruRose Riverwalk G, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (198)   (576)  
Elmajo Urban Renewal Associates, L.L.C. [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (87)   (255)  
Estuary Urban Renewal Unit B, LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (44)   (107)  
Crystal House Apartments Investors LLC [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (1,149)   (2,671)  
Other [Member]
       
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 682   $ 682