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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (1,533) $ 21,790 $ (4,882) $ 19,622
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 52 76 261 208
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   (277) (266) (869)
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 (81) (76) (234) (239)
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 52 (594) 143 (1,189)
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 (171) (99) (752) (321)
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 (298) (36) (712) (36)
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 25 105 86 (202)
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 (85) (43) (162) (173)
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 (447) (500) (1,272) (1,995)
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 (2,053) (42) (5,174) (60)
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   (22) (25) (53)
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   81 385 256
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 90 111 306 321
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 186 74 317 266
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 29 109 74 (68)
Unconsolidated Joint Venture Office Buildings [Member] | Keystone-Penn [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   150   450
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   (518)   (1,186)
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 148 113 (436) 518
Unconsolidated Joint Venture Other Property [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (1,533) 21,790 (4,882) 19,622
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 (23) (14) (60) (39)
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 973 22,447 2,310 23,267
Unconsolidated Joint Venture Other Property [Member] | Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 70 $ 745 $ 344 $ 826