Annual report pursuant to Section 13 and 15(d)

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

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Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - USD ($)
 12 Months Ended 16 Months Ended 60 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2017
Apr. 30, 2022
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) $ 1,100,000 $ 1,100,000 $ 990,000    
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) $ 3,900,000 3,900,000 $ 3,400,000    
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%        
111 River Realty [Member]          
Commitments And Contingencies [Line Items]          
Payments in lieu of property taxes (PILOT) $ 1,300,000 $ 600,000      
Annual Payments in lieu of property taxes (PILOT)       $ 1,227,708  
111 River Realty [Member] | Scenario, Forecast [Member]          
Commitments And Contingencies [Line Items]          
Annual Payments in lieu of property taxes (PILOT)         $ 1,406,064
Monaco [Member]          
Commitments And Contingencies [Line Items]          
Project period 10 years        
Payments in lieu of property taxes (PILOT) $ 1,643,522        
Percentage of PILOT on gross revenues 10.00%