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 9 Months Ended
Feb. 28, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 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   $ 1,373 $ (113) $ (281) $ (882)      
Amortization of basis difference   143 156          
Red Bank [Member]                
Schedule of Equity Method Investments [Line Items]                
Gain on sale $ 900              
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]                
Schedule of Equity Method Investments [Line Items]                
Company's equity in earnings (loss) of unconsolidated joint ventures   $ (276) (135) $ (611) (333)      
Company's Effective Ownership %   25.00%   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   $ (3) 47 $ 130 137      
Company's Effective Ownership %   22.50%   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   $ (257) (117) $ (598) (526)      
Company's Effective Ownership %   25.00%   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   $ (102) (79) $ (340) (211)      
Company's Effective Ownership %   40.00%   40.00%        
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 %             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   $ (62) (34) $ (186) (159)      
Company's Effective Ownership %   45.00%   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   $ (677) (392) $ (1,816) (1,486)      
Company's Effective Ownership %   50.00%   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   $ 1,924 (240) $ 1,915 (989)      
Economic tax credit certificate income       $ 2,600        
Period of venture agreement to sell economic tax credit       7 years        
Annual proceeds from economic tax credit       $ 3,000        
Total proceeds from economic tax credit       $ 21,000        
Company's Effective Ownership %   85.00%   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%   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%   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   $ 92 125 $ 350 282      
Company's Effective Ownership %   50.00%   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   $ 72 36 $ 147 65      
Company's Effective Ownership %   31.25%   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   $ 1,373 (113) $ (281) (882)      
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     (21) $ (11) (63)      
Company's Effective Ownership %   20.00%   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   $ 412 750 $ 363 2,388      
Company's Effective Ownership %   50.00%   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   $ 250 $ (53) $ 376 $ 20