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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ (2,329) $ 443 $ (5,858) $ (792)
Marbella RoseGarden, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 61 (9) 122 (15)
RoseGarden Monaco Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (313) (238) (629) (515)
Rosewood Lafayette Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (203) (62) (419)
Rosewood Morristown, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (91) (76) (185) (174)
Overlook Ridge JV 2C/3B, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (27)   (247) 62
PruRose Riverwalk G, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (276) (613) (530) (1,151)
Elmajo Urban Renewal Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (91)   (203)
Crystal House Apartments Investors LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 13 53 3 (274)
Portside Master Company, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (637) (220) (1,357) (434)
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 (506) (213) (731) (418)
Roseland/Port Imperial Partners, L.P. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (125) (180) (309) (345)
Estuary Urban Renewal Unit B, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures       (15)
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 (150)   (324)  
Capitol Place Mezz LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (1,263)   (1,188)  
Harborside Unit A Urban Renewal, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   (212)   (212)
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   (16) (19) (54)
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 112 106 222 205
12 Vreeland Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 86 54 72 144
BNES Associates III [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 52 110 121 147
Hillsborough 206 Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (5)   (5) (5)
KPG-P 100 IMW JV, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (379) (483) (763) (1,136)
Keystone-TriState [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (242)   (1,590)  
KPG-MCG Curtis JV, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 232 251 428 251
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 70 44 156 146
Roseland/North Retail, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (18) (23) (36) (47)
South Pier At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 868 892 784 1,290
Stamford SM LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures   928   1,844
Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ 209 $ 582 $ 209 $ 536