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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ (614) $ (2,329) $ (2,168) $ (5,858)
Marbella RoseGarden, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 47 61 132 122
RoseGarden Monaco Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (300) (313) (592) (629)
Rosewood Morristown, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (82) (91) (163) (185)
Riverwalk G Urban Renewal, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (595) (276) (595) (530)
Crystal House Apartments Investors LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (110) 13 (222) 3
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)   (309)
RoseGarden Marbella South, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (307)   (307)  
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 (102) (150) (130) (324)
Capitol Place Mezz LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (727) (1,263) (1,495) (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     (17)  
Grand Jersey Waterfront URA, 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 (13) (5) (32) (5)
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 98 70 175 156
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 108 112 210 222
12 Vreeland Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 108 86 192 72
BNES Associates III [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 17 52 (177) 121
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)   (763)
Keystone-TriState [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (191) (242) (668) (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 226 232 405 428
Roseland/North Retail, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures (9) (18) (25) (36)
South Pier At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures 987 868 820 784
Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings (loss) of unconsolidated joint ventures $ 231 $ (961) $ 381 $ (2,188)