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 9 Months Ended 16 Months Ended 60 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
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) $ 345,000 $ 279,000   $ 1,000,000 $ 798,000    
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) 1,200,000 1,100,000   $ 3,800,000 2,900,000    
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) 381,000 $ 307,000   $ 995,000 $ 30,700    
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) $ 558,000   $ 1,100,000        
Percentage of PILOT on gross revenues       10.00%