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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (80) $ 1,733 $ (1,830) $ 2,333
Plaza VIII & IX Associates, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 19 12 28 22
South Pier At Harborside [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 1,056 792 545 804
Red Bank Corporate Plaza, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 106 101 207 204
12 Vreeland Associates, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 116 125 24 324
Boston Downtown Crossing [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 651 (227) 646 (327)
Gale Jefferson, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   20 68 40
Stamford SM LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 897 910 1,782 1,266
Marbella RoseGarden, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (165)   (276)  
RoseGarden Monaco Holdings, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (423)   (822)  
Rosewood Lafayette Holdings, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (284)   (574)  
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 (117)   (241)  
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 224   151  
Roseland/North Retail, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (83)   (132)  
BNES Associates III [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (2)   (71)  
Portside Master Company, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (68)   (113)  
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 (145)   (278)  
RoseGarden Marbella South, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (19)   (37)  
PruRose Riverwalk G, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (192)   (378)  
Elmajo Urban Renewal Associates, L.L.C. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (82)   (168)  
Estuary Urban Renewal Unit B, LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (34)   (63)  
Crystal House Apartments Investors LLC [Member]
        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (1,535)   $ (1,522)