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
Mar. 31, 2017
Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures $ (51) $ (1,554)
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 109 84
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 (265) (291)
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 (85) (81)
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 48  
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 (293) (112)
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 (131)  
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 27  
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 (11) (28)
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 (375) (767)
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 (145) (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 (25) (19)
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 386 77
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 106 101
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 77 84
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 6 (194)
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   (477)
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 (41) 179
Unconsolidated Joint Venture Other Property [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures (51) (1,554)
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 (11) (16)
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 $ 587 (167)
Unconsolidated Joint Venture Other Property [Member] | Other [Member]    
Schedule of Equity Method Investments [Line Items]    
Company's equity in earnings of unconsolidated joint ventures   $ 150