Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures $ (127) $ (6,081) $ 18,788
Amortization of basis difference 903 792 436
Hillsborough 206 [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures 16 (25) (53)
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella I [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures 205 334 231
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 (455) (311) (317)
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 154 196 (1,146)
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 (874) (923) (870)
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North Pier Land [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures (126) (219) (62)
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   (653) (58)
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 35 93 (202)
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 (232) (252) (190)
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 (2,096) (1,793) (2,440)
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 (975) (6,356) (219)
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] | Liberty Landing [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures (5) (15) (80)
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 (215) 238 448
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 285 496 347
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 73 89 (15)
Unconsolidated Joint Venture Other Property [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures (127) (6,081) 18,788
Unconsolidated Joint Venture Other Property [Member] | Roseland/North Retail, L.L.C./ Riverwalk At Port Imperial [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures (86) (81) (52)
Unconsolidated Joint Venture Other Property [Member] | South Pier At Harborside / Hyatt Regency Jersey City On The Hudson [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures 3,672 3,277 24,180
Unconsolidated Joint Venture Other Property [Member] | Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings of unconsolidated joint ventures $ 497 $ (176) $ (714)