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
Jan. 31, 2019
Jan. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]              
Company's equity in earnings (loss) of unconsolidated joint ventures       $ (113) $ (687) $ (882) $ 833
Amortization of basis difference       156 230 484 809
Red Bank [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of interest sold 50.00%            
Gain on sale $ 900            
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella I [Member]              
Schedule of Equity Method Investments [Line Items]              
Company's equity in earnings (loss) of unconsolidated joint ventures         21   205,000
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       $ (135) (131) $ (333,000) (362,000)
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       $ 47 33 $ 137,000 122,000
Company's Effective Ownership %       22.50%   22.50%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella Tower Urban Renewal Associates LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of additional interest acquired   50.00% 50.00%        
Company's Effective Ownership %     24.27%        
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       $ (117) (192) $ (526,000) (617,000)
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       $ (79) (51) $ (211,000) (88,000)
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         11 $ (15,000) 42,000
Company's Effective Ownership %       24.27%   24.27%  
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       $ (34) (26) $ (159,000) (174,000)
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       $ (392) (531) $ (1,486,000) (1,443,000)
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       $ (240) (990) $ (989,000) 157,000
Economic tax credit certificate income           2,600  
Annual proceeds from economic tax credit           3,000  
Total proceeds from economic tax credit           $ 27,000  
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 equity in earnings (loss) of unconsolidated joint ventures             15,000
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         (65) $ 8,000 (193,000)
Company's Effective Ownership %       50.00%   50.00%  
Gain on sale $ 900            
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       $ 125 119 $ 282,000 157,000
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       $ 36 37 $ 65,000 57,000
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       $ (113) (687) $ (882) 833
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) (20) $ (63,000) (65,000)
Company's Effective Ownership %       20.00%   20.00%  
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]              
Schedule of Equity Method Investments [Line Items]              
Company's equity in earnings (loss) of unconsolidated joint ventures       $ 750 1,024 $ 2,388,000 2,560,000
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       $ (53) $ 74 $ 20,000 $ 460,000