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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ (52) $ (3,298) $ 1,520 $ (3,349)
Amortization of basis difference 289 289 579 548
Urby At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Economic tax credit certificate income     $ 2,600  
Period of venture agreement to sell economic tax credit     9 years  
Annual proceeds from economic tax credit     $ 3,000  
Total proceeds from economic tax credit     27,000  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 93 100 184 209
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (156) (68) (231) (153)
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 45 42 89 91
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (263) (289) (425) (581)
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (37) (283) (37) (414)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 8 34 30 61
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (85) (66) (148) (77)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (484) (449) (912) (825)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (574) (2,976) 1,147 (3,121)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures       (15)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures     15 (25)
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (55) 109 (128) 216
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (21) 54 38 131
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (6) 39 20 45
Unconsolidated Joint Venture Other Property [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (52) (3,298) 1,520 (3,349)
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures (20) (26) (45) (37)
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures 1,226 750 1,536 1,337
Unconsolidated Joint Venture Other Property [Member] | Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's equity in earnings of unconsolidated joint ventures $ 277 $ (269) $ 387 $ (191)