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 16 Months Ended 60 Months Ended
Mar. 31, 2021
Mar. 31, 2020
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) $ 264,000 $ 264,000    
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) $ 1,100,000 1,100,000    
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 1.00%      
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%      
Payments in lieu of property taxes (PILOT) $ 700,000 600,000    
Port Imperial South 11 Development [Member]        
Commitments And Contingencies [Line Items]        
Project period 15 years      
Payments in lieu of property taxes (PILOT) $ 300,000 300,000    
Percentage of PILOT on gross revenues 10.00%      
111 River Realty [Member]        
Commitments And Contingencies [Line Items]        
Payments in lieu of property taxes (PILOT) $ 400,000 400,000    
Annual Payments in lieu of property taxes (PILOT)     $ 1,200,000  
111 River Realty [Member] | Scenario, Forecast [Member]        
Commitments And Contingencies [Line Items]        
Annual Payments in lieu of property taxes (PILOT)       $ 1,400,000
Monaco (BLVD 495 N/S) [Member]        
Commitments And Contingencies [Line Items]        
Project period 10 years      
Percentage of PILOT on project costs 10.00%      
Payments in lieu of property taxes (PILOT) $ 500,000 500,000    
Marbella II [Member]        
Commitments And Contingencies [Line Items]        
Project period 10 years      
Payments in lieu of property taxes (PILOT) $ 300,000 $ 300,000    
Marbella II [Member] | Years 1-4 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on project costs 10.00%      
Marbella II [Member] | Years 5-8 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on project costs 12.00%      
Marbella II [Member] | Years 9-10 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on project costs 14.00%      
Port Imperial South 9 [Member]        
Commitments And Contingencies [Line Items]        
Project period 25 years      
Total project costs $ 143,800,000      
Port Imperial South 9 [Member] | Years 1-10 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on project costs 11.00%      
Port Imperial South 9 [Member] | Years 11-18 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on gross revenues 12.50%      
Port Imperial South 9 [Member] | Years 19-25 [Member]        
Commitments And Contingencies [Line Items]        
Percentage of PILOT on gross revenues 14.00%      
Port Imperial South Park Parcel [Member]        
Commitments And Contingencies [Line Items]        
Project period 25 years      
Percentage of PILOT on gross revenues 10.00%