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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (3,298) $ (614) $ (3,349) $ (2,168)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella RoseGarden, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 100 47 209 132
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Monaco Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   (300) (266) (592)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Rosewood Morristown, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (68) (82) (153) (163)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverwalk G Urban Renewal, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 42 (595) 91 (595)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House Apartments Investors LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (289) (110) (581) (222)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Roseland/Port Imperial Partners, L.P. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (283)   (414)  
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Marbella South, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 34 (307) 61 (307)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison I, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (66) (102) (77) (130)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Capitol Place Mezz LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (449) (727) (825) (1,495)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Harborside Unit A Urban Renewal, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (2,976)   (3,121) (17)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Grand Jersey Waterfront URA, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures     (15) (60)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 Holdings, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   (13) (25) (32)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Plaza VIII & IX Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   98 385 175
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank Corporate Plaza, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 109 108 216 210
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 54 108 131 192
Unconsolidated Joint Venture Office Buildings [Member] | BNES Associates III [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 39 17 45 (177)
Unconsolidated Joint Venture Office Buildings [Member] | Keystone-TriState [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   (191)   (668)
Unconsolidated Joint Venture Office Buildings [Member] | KPG-MCG Curtis JV, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (543) 226 (584) 405
Unconsolidated Joint Venture Other Property [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (3,298) (614) (3,349) (2,168)
Unconsolidated Joint Venture Other Property [Member] | Roseland/North Retail, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (26) (9) (37) (25)
Unconsolidated Joint Venture Other Property [Member] | South Pier At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 750 987 1,337 820
Unconsolidated Joint Venture Other Property [Member] | Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 274 $ 231 $ 274 $ 381