Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 29, 2021
USD ($)
Mar. 31, 2021
USD ($)
ft²
item
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]        
Carrying Value   $ 159,971   $ 162,382
Purchase price of property   $ 16,978 $ 63,004  
Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's Effective Ownership %   20.00%    
Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's Effective Ownership %   85.00%    
PI North - Riverwalk C [Member] | Construction Loan [Member]        
Schedule of Equity Method Investments [Line Items]        
Maximum borrowing capacity   $ 112,000    
Percent of principal loan outstanding   10.00%    
PI North - Land [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   771    
Residual ownership interest   20.00%    
12 Vreeland Road [Member]        
Schedule of Equity Method Investments [Line Items]        
Property impairments on continuing operations       2,600
12 Vreeland Road [Member] | Subsequent Event [Member]        
Schedule of Equity Method Investments [Line Items]        
Gain on sale $ 2,000      
The Shops At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²   50,973    
Balance   $ 6,067    
Property Debt, Interest Rate, Spread Over LIBOR   0.015%    
Residual ownership interest   25.00%    
Mortgage loan, maturity month and year   October 2021    
Lofts At 40 Park Property [Member] | Metropolitan And Lofts At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   59    
Balance   $ 18,200    
Property Debt, Interest Rate, Spread Over LIBOR   0.015%    
Indirect ownership interest   50.00%    
Number of stories | item   5    
Mortgage loan, maturity month and year   January 2023    
Metropolitan Property [Member] | Metropolitan And Lofts At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Balance   $ 36,500    
Property Debt, Interest Rate, Spread Over LIBOR   0.0285%    
Mortgage loan, maturity month and year   October 2023    
Unconsolidated Joint Venture Multi-Family Properties [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   1,786    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan And Lofts At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   189    
Company's Effective Ownership %   25.00%    
Carrying Value   $ 3,116   3,347
Balance   $ 60,767    
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   316    
Company's Effective Ownership %   22.50%    
Carrying Value   $ 6,472   6,667
Balance   $ 82,000    
Property Debt, Maturity Date   Nov. 10, 2026    
Property Debt, Interest Rate   3.21%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   360    
Company's Effective Ownership %   40.00%    
Carrying Value   $ 37,201   36,992
Balance   $ 86,116    
Property Debt, Maturity Date   Dec. 06, 2021    
Property Debt, Interest Rate   2.75%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   141    
Company's Effective Ownership %   45.00%    
Carrying Value   $ 604   681
Balance   $ 30,192    
Property Debt, Maturity Date   Jul. 01, 2035    
Property Debt, Interest Rate   3.19%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   378    
Company's Effective Ownership %   50.00%    
Carrying Value   $ 33,962   34,026
Balance   $ 94,693    
Property Debt, Maturity Date   Jul. 01, 2033    
Property Debt, Interest Rate   4.82%    
Unconsolidated Joint Venture Multi-Family Properties [Member] | Urby At Harborside [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   762    
Company's Effective Ownership %   85.00%    
Carrying Value   $ 70,817   72,752
Balance   $ 192,000    
Property Debt, Maturity Date   Aug. 01, 2029    
Property Debt, Interest Rate   5.197%    
Guaranteed amount   $ 22,000    
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Land [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   771    
Company's Effective Ownership %   20.00%    
Carrying Value   $ 1,678   1,678
Unconsolidated Joint Venture Multi-Family Properties [Member] | Liberty Landing [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   850    
Company's Effective Ownership %   50.00%    
Carrying Value   $ 337   337
Unconsolidated Joint Venture Office Buildings [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²   200,000    
Unconsolidated Joint Venture Office Buildings [Member] | 12 Vreeland Road [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²   139,750    
Company's Effective Ownership %   50.00%    
Carrying Value   $ 1,811   1,811
Balance   $ 4,154    
Property Debt, Maturity Date   Jul. 01, 2023    
Property Debt, Interest Rate   2.87%    
Unconsolidated Joint Venture Office Buildings [Member] | Offices At Crystal Lake [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²   106,345    
Company's Effective Ownership %   31.25%    
Carrying Value   $ 3,626   3,744
Balance   $ 2,328    
Property Debt, Maturity Date   Nov. 01, 2023    
Property Debt, Interest Rate   4.76%    
Unconsolidated Joint Venture Other Property [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value   $ 159,971   162,382
Balance   $ 652,250    
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Hotel Jersey City [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Apartment Units | item   351    
Company's Effective Ownership %   50.00%    
Balance   $ 100,000    
Property Debt, Maturity Date   Oct. 01, 2026    
Property Debt, Interest Rate   3.668%    
Unconsolidated Joint Venture Other Property [Member] | Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Carrying Value   $ 347   $ 347