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
 6 Months Ended
Mar. 30, 2018
USD ($)
item
Feb. 03, 2017
USD ($)
Jun. 30, 2018
USD ($)
ft²
item
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of units | item     858  
Carrying Value     $ 247,607 $ 252,626
Minimum [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's Effective Ownership %     12.50%  
Maximum [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's Effective Ownership %     85.00%  
Crystal House [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of interest in developable land     50.00%  
Number of units available for development | item     295  
Number of approved units available for development | item     252  
PI North - Riverwalk C [Member] | Construction Loan [Member]        
Schedule of Equity Method Investments [Line Items]        
Maximum borrowing capacity     $ 112,000  
Marbella II [Member] | Construction Loan [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of extension options | item 4      
Loan extension period 3 months      
Extension fee 0.0625%      
Maximum borrowing capacity $ 75,000      
Urby At Harborside [Member] | Construction/Permanent Loan [Member]        
Schedule of Equity Method Investments [Line Items]        
Company's Effective Ownership %     85.00%  
Maximum borrowing capacity     $ 192,000  
PI North - Land [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     836  
Residual ownership interest     20.00%  
The Shops At 40 Park Property [Member] | Metropolitan At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²     50,973  
Property Debt, Balance     $ 6,103  
Property Debt, Maturity Date     Aug. 01, 2018  
Property Debt, Interest Rate     3.63%  
Residual ownership interest     12.50%  
Lofts At 40 Park Property [Member] | Metropolitan At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     59  
Indirect ownership interest     25.00%  
Number of stories | item     5  
Lofts At 40 Park Property [Member] | Metropolitan At 40 Park [Member] | Construction Loan [Member]        
Schedule of Equity Method Investments [Line Items]        
Property Debt, Balance   $ 13,105    
Property Debt, Maturity Date     Feb. 01, 2020  
Property Debt, Interest Rate, Spread Over LIBOR   2.50%    
Maximum borrowing capacity   $ 13,950    
Metropolitan Property [Member] | Metropolitan At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Property Debt, Balance     $ 36,430  
Property Debt, Maturity Date     Sep. 01, 2020  
Property Debt, Interest Rate     3.25%  
Unconsolidated Joint Venture Multi-Family Properties [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     3,334  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     412  
Company's Effective Ownership %     24.27%  
Carrying Value     $ 14,141 14,544
Property Debt, Balance     $ 95,000  
Property Debt, Maturity Date     May 01, 2019  
Property Debt, Interest Rate, LIBOR     L+1.50  
Property Debt, Interest Rate, Spread Over LIBOR     1.50%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     189  
Company's Effective Ownership %     12.50%  
Carrying Value     $ 6,603 6,834
Property Debt, Balance     $ 55,638  
Property Debt, Interest Rate      
Unconsolidated Joint Venture Multi-Family Properties [Member] | RiverTrace At Port Imperial [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     316  
Company's Effective Ownership %     22.50%  
Carrying Value     $ 8,481 8,864
Property Debt, Balance     $ 82,000  
Property Debt, Maturity Date     Nov. 10, 2026  
Property Debt, Interest Rate     3.21%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Crystal House [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     825  
Company's Effective Ownership %     25.00%  
Carrying Value     $ 29,498 30,570
Property Debt, Balance     $ 164,464  
Property Debt, Maturity Date     Apr. 01, 2020  
Property Debt, Interest Rate     3.17%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Riverwalk C [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     360  
Company's Effective Ownership %     40.00%  
Carrying Value     $ 20,035 16,844
Property Debt, Maturity Date     Dec. 06, 2021  
Property Debt, Interest Rate, LIBOR     L+2.75  
Property Debt, Interest Rate, Spread Over LIBOR     2.75%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella II [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     311  
Company's Effective Ownership %     24.27%  
Carrying Value     $ 15,974 16,471
Property Debt, Balance     $ 74,690  
Property Debt, Maturity Date     Mar. 30, 2019  
Property Debt, Interest Rate, LIBOR     L+2.25  
Property Debt, Interest Rate, Spread Over LIBOR     2.25%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Riverpark At Harrison [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     141  
Company's Effective Ownership %     45.00%  
Carrying Value     $ 1,392 1,604
Property Debt, Balance     $ 30,000  
Property Debt, Maturity Date     Aug. 01, 2025  
Property Debt, Interest Rate     3.70%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | Station House [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     378  
Company's Effective Ownership %     50.00%  
Carrying Value     $ 38,906 40,124
Property Debt, Balance     $ 99,296  
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 units | item     762  
Company's Effective Ownership %     85.00%  
Carrying Value     $ 89,988 94,429
Property Debt, Balance     $ 191,732  
Property Debt, Maturity Date     Aug. 01, 2029  
Property Debt, Interest Rate     5.197%  
Unconsolidated Joint Venture Multi-Family Properties [Member] | PI North - Land [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     836  
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 units | item     850  
Company's Effective Ownership %     50.00%  
Carrying Value     $ 337 337
Unconsolidated Joint Venture Multi-Family Properties [Member] | Hillsborough 206 [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²     160,000  
Company's Effective Ownership %     50.00%  
Carrying Value     $ 1,962 1,962
Unconsolidated Joint Venture Office Buildings [Member] | Red Bank [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²     92,878  
Company's Effective Ownership %     50.00%  
Carrying Value     $ 4,473 4,602
Property Debt, Balance     $ 13,626  
Property Debt, Maturity Date     Aug. 15, 2018  
Property Debt, Interest Rate, LIBOR     L+3.00  
Property Debt, Interest Rate, Spread Over LIBOR     3.00%  
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     $ 6,771 6,734
Property Debt, Balance     $ 8,705  
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     $ 3,389 3,369
Property Debt, Balance     $ 4,439  
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     $ 247,607 252,626
Property Debt, Balance     $ 919,590  
Unconsolidated Joint Venture Other Property [Member] | Riverwalk Retail [Member]        
Schedule of Equity Method Investments [Line Items]        
Rentable Square Feet (sf) | ft²     30,745  
Company's Effective Ownership %     20.00%  
Carrying Value     $ 1,580 1,625
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of units | item     351  
Company's Effective Ownership %     50.00%  
Carrying Value     $ 476 440
Property Debt, 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     $ 1,923 $ 1,595