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
Feb. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 12, 2020
Aug. 01, 2019
Jan. 31, 2019
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (708) $ (681)      
Amortization of basis difference   152 172      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (140) (77)      
Company's Effective Ownership %   25.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ 98 38      
Company's Effective Ownership %   22.50%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (159) (226)      
Company's Effective Ownership %   25.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (119) (70)      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures     (15)      
Company's Effective Ownership %   40.00%     24.27% 50.00%
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (58) (60)      
Company's Effective Ownership %   45.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (467) (556)      
Company's Effective Ownership %   50.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ 17 (458)      
Company's Effective Ownership %   85.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's Effective Ownership %   50.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's Effective Ownership %   50.00%        
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures     8      
Percentage of interest sold 50.00%          
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ 111 45      
Company's Effective Ownership %   50.00%        
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ 20 45      
Company's Effective Ownership %   31.25%        
Unconsolidated Joint Venture Other Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (708) (681)      
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (11) (21)      
Company's Effective Ownership %   20.00%   80.00%    
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Hotel Jersey City [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures     638      
Company's Effective Ownership %   50.00%        
Unconsolidated Joint Venture Other Property [Member] | Other [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's equity in earnings (loss) of unconsolidated joint ventures     $ 28