Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details)

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Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Harborside Plaza 4-A [Member]        
Commitments And Contingencies [Line Items]        
Project period     20 years  
Percentage of PILOT on project costs     2.00%  
Total project costs     $ 49,500,000  
Payments in lieu of property taxes (PILOT) $ 271,000 $ 247,000 $ 519,000 $ 495,000
Harborside Plaza 5 [Member]        
Commitments And Contingencies [Line Items]        
Project period     20 years  
Percentage of PILOT on project costs     2.00%  
Total project costs     $ 170,900,000  
Payments in lieu of property taxes (PILOT) $ 917,000 $ 854,000 $ 1,800,000 $ 1,700,000
Port Imperial South 4/5 Garage [Member]        
Commitments And Contingencies [Line Items]        
Project period     5 years  
Port Imperial South 4/5 Garage [Member] | Tax Year 1 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     0.00%  
Port Imperial South 4/5 Garage [Member] | Tax Year 2 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     80.00%  
Port Imperial South 4/5 Garage [Member] | Tax Year 3 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     80.00%  
Port Imperial South 4/5 Garage [Member] | Tax Year 4 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     80.00%  
Port Imperial South 4/5 Garage [Member] | Tax Year 5 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     80.00%  
Port Imperial South 1/3 Garage [Member]        
Commitments And Contingencies [Line Items]        
Project period     5 years  
Percentage of taxes paid based on the land value     100.00%  
Port Imperial South 1/3 Garage [Member] | Tax Year 1 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     0.00%  
Port Imperial South 1/3 Garage [Member] | Tax Year 2 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     95.00%  
Port Imperial South 1/3 Garage [Member] | Tax Year 3 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     95.00%  
Port Imperial South 1/3 Garage [Member] | Tax Year 4 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     95.00%  
Port Imperial South 1/3 Garage [Member] | Tax Year 5 [Member]        
Commitments And Contingencies [Line Items]        
Annual percentage of cost for phase in     95.00%  
Port Imperial Hotel Development [Member]        
Commitments And Contingencies [Line Items]        
Project period     15 years  
Percentage of PILOT on project costs     2.00%  
Port Imperial South 11 Development [Member]        
Commitments And Contingencies [Line Items]        
Project period     15 years  
Percentage of PILOT on gross revenues     10.00%