Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details)
$ in Thousands
12 Months Ended
Aug. 02, 2018
USD ($)
item
Aug. 01, 2018
USD ($)
item
Mar. 30, 2018
USD ($)
item
Feb. 03, 2017
Dec. 31, 2018
USD ($)
ft²
item
Jan. 31, 2019
USD ($)
Dec. 11, 2018
Dec. 31, 2017
USD ($)
Feb. 15, 2017
Feb. 02, 2017
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item         1,317            
Carrying Value         $ 232,750     $ 252,626      
Balance         45,242     45,734    
Mortgage loan face amount         $ 41,695            
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%            
Marbella Tower Urban Renewal Associates LLC [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item 412                    
Company's Effective Ownership %   24.27%                  
Balance $ 131,000 $ 95,000                  
Property Debt, Maturity Date         Aug. 01, 2026            
Property Debt, Interest Rate, Spread Over LIBOR 4.07%                    
Percentage of additional interest acquired 50.00%                    
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 Apartment Units | item         836            
Residual ownership interest         20.00%            
Plaza VIII & IX Associates, L.L.C. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Company's Effective Ownership %                   50.00%  
Percentage of additional interest acquired       12.50%              
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            
Balance         $ 6,100            
Property Debt, Maturity Date         Sep. 01, 2019            
Property Debt, Interest Rate, LIBOR         LIBOR+2.25            
Property Debt, Interest Rate, Spread Over LIBOR         2.25%            
Residual ownership interest         12.50%   25.00%        
Lofts At 40 Park Property [Member] | Metropolitan At 40 Park [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item         59            
Indirect ownership interest         25.00%   50.00%        
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]                      
Balance         $ 13,100            
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]                      
Balance         $ 36,000            
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 Apartment Units | item         2,922            
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella RoseGarden, L.L.C. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item         412            
Company's Effective Ownership %         24.27%            
Carrying Value               14,544      
Unconsolidated Joint Venture Multi-Family Properties [Member] | Marbella Tower Urban Renewal Associates LLC [Member] | Subsequent Event [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Company's Effective Ownership %           50.00%          
Balance           $ 117,000          
Unconsolidated Joint Venture Multi-Family Properties [Member] | Metropolitan At 40 Park [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item         130            
Company's Effective Ownership %         25.00%            
Carrying Value         $ 7,679     6,834      
Balance         $ 55,227            
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         $ 8,112     8,864      
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 Apartment Units | item         825            
Company's Effective Ownership %         25.00%            
Carrying Value         $ 29,570     30,570      
Balance         $ 162,838            
Property Debt, Maturity Date         Apr. 01, 2020            
Property Debt, Interest Rate         3.17%            
Number of units available for development | item         295            
Number of approved units available for development | item         252            
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         $ 27,175     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 Apartment Units | item         311            
Company's Effective Ownership %         24.27%            
Carrying Value         $ 15,414     16,471      
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] | Marbella II [Member] | Subsequent Event [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Balance           $ 117,000          
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         $ 1,272     1,604      
Balance         $ 29,819            
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 Apartment Units | item         378            
Company's Effective Ownership %         50.00%            
Carrying Value         $ 37,675     40,124      
Balance         $ 98,504            
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         $ 85,317     94,429      
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 Apartment 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 Apartment 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 Multi-Family Properties [Member] | Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Company's Effective Ownership %                 7.50%    
Unconsolidated Joint Venture Office Buildings [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Rentable Square Feet (sf) | ft²         500,000            
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         $ 3,127     4,602      
Balance         $ 14,000            
Property Debt, Maturity Date         Aug. 01, 2023            
Property Debt, Interest Rate, LIBOR         L+2.25            
Property Debt, Interest Rate, Spread Over LIBOR         2.25%            
Number of extension options | item   2                  
Maximum borrowing capacity   $ 16,500                  
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         $ 7,019     6,734      
Balance         $ 7,904            
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         $ 3,442     3,369      
Balance         $ 4,076            
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         $ 232,750     252,626      
Balance         $ 820,790            
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         $ 1,539     1,625      
Unconsolidated Joint Venture Other Property [Member] | Hyatt Regency Jersey City [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Number of Apartment Units | item         351            
Company's Effective Ownership %         50.00%            
Carrying Value         $ 112     440      
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         $ 1,320     $ 1,595