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
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Harborside Financial Center 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) $ 990,000 $ 990,000 $ 990,000
Harborside Financial Center 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) $ 3,400,000 $ 3,400,000 $ 3,400,000
Port Imperial South 4/5 Garage [Member]      
Commitments And Contingencies [Line Items]      
Project period 5 years    
Period of real estate taxes phase in 5 years    
Park Square [Member]      
Commitments And Contingencies [Line Items]      
Period of partial abatement of real estate taxes 4 years