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 12 Months Ended
Sep. 01, 2021
Apr. 29, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mar. 12, 2020
Mar. 11, 2020
Schedule of Equity Method Investments [Line Items]                  
Company's equity in earnings (loss) of unconsolidated joint ventures     $ (1,724) $ 1,373 $ (2,831) $ (281)      
Amortization of basis difference     141 143 427 438      
12 Vreeland Road [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Gain on sale   $ 2,000              
Sale price   $ 2,000              
Offices At Crystal Lake [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Sale price $ 1,900                
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     $ (163) (276) $ (659) (611)      
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     $ (4) (3) $ (14) 130      
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)   (598)      
Gain on sale             $ 35,100    
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     $ 171 (102) $ (287) (340)      
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     $ (1,008) (62) $ (1,135) (186)      
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     $ (291) (677) $ (1,109) (1,816)      
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     $ (1,026) 1,924 $ (90) 1,915      
Company's Effective Ownership %     85.00%   85.00%        
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North Pier Land [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Company's equity in earnings (loss) of unconsolidated joint ventures     $ (38)   $ (156)        
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 $ 2 350      
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     $ 22 72 $ (113) 147      
Company's Effective Ownership %     31.25%   31.25%        
Gain on sale (1,900)                
Sale price $ 1,900                
Unconsolidated Joint Venture Other Property [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Company's equity in earnings (loss) of unconsolidated joint ventures     $ (1,724) 1,373 $ (2,831) (281)      
Unconsolidated Joint Venture Other Property [Member] | Riverpark At Harrison [Member] | Certain Obligations [Member]                  
Schedule of Equity Method Investments [Line Items]                  
Company's equity in earnings (loss) of unconsolidated joint ventures     900   900        
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)      
Company's Effective Ownership %                 80.00%
Ownership Percentage               100.00%  
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   363      
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     $ 616 $ 250 $ 733 $ 376