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) - Entity [Domain] - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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) $ 247,000 $ 247,000 $ 495,000 $ 495,000
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) $ 854,000 $ 854,000 $ 1,700,000 $ 1,700,000
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