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
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures $ (1,554) $ (3,529)
Marbella RoseGarden, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 84 61
RoseGarden Monaco Holdings, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (291) (317)
Rosewood Morristown, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (81) (94)
PruRose Riverwalk G, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (254)
Crystal House Apartments Investors LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (112) (10)
Portside Master Company, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (719)
PruRose Port Imperial South 13, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (225)
Roseland/Port Imperial Partners, L.P. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (184)
RiverPark At Harrison I, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (28) (173)
Capitol Place Mezz LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (767) 75
Harborside Unit A Urban Renewal, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (17)  
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (60) (19)
Hillsborough 206 Holdings, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (19)  
Plaza VIII & IX Associates, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 77 86
Red Bank Corporate Plaza, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 101 110
12 Vreeland Associates, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 84 (14)
BNES Associates III [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (194) 68
KPG-P 100 IMW JV, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures   (384)
Keystone-TriState [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (477) (1,348)
KPG-MCG Curtis JV, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures 179 196
Roseland/North Retail, L.L.C. [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (16) (18)
South Pier At Harborside [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures (167) (84)
Other [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings (loss) of unconsolidated joint ventures $ 150 $ (282)