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)

v3.5.0.2
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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 21,790 $ 3,135 $ 19,622 $ (2,723)
South Pier At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 22,447 1,151 23,267 1,934
Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (657) 1,984 (3,645) (4,657)
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 76 64 208 186
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) (295) (869) (924)
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 (76) (93) (239) (277)
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 (594) (151) (1,189) (681)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Elmajo Urban Renewal Associates, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures
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 (99) (44) (321) (41)
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 (36) (85) (36) (394)
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 105   (202)  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Estuary Urban Renewal Unit B, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures
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 (43) (54) (173) (377)
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 (500) (1,454) (1,995) (2,642)
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 (42)   (60)  
Unconsolidated Joint Venture Multi-Family Properties [Member] | RoseGarden Monaco, L.L.C. [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures
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   (12) (60) (32)
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)   (53) (5)
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 81 102 256 258
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 111 110 321 332
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 74 38 266 110
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 109 13 (68) 133
Unconsolidated Joint Venture Office Buildings [Member] | KPG-P 100 IMW JV, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures   (37)   (800)
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 3,663 450 3,663
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) (173) (1,186) (1,763)
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 113 327 518 755
Unconsolidated Joint Venture Other Property [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 21,790 3,135 19,622 (2,723)
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 (14) (17) (39) (52)
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 22,447 1,151 23,267 1,934
Unconsolidated Joint Venture Other Property [Member] | Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 745 $ 82 $ 826 $ (2,106)