Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Ground lease expense incurred $ 102,000 $ 102,000 $ 305,000 $ 388,000
Area of building in square feet     203,000  
Lease term description     15 years and 3 months, subject to two extension options of between five and 10 years each  
Delivery date to tenant     first quarter of 2013  
Total estimated costs of the project     58,400,000  
Property Lock-Ups [Member]
        
Properties aggregate net book value     132,200,000  
Expiration year     2016  
Number of properties 7   7  
Property Lock-Ups Expired [Member]
        
Properties aggregate net book value     1,700,000,000  
Number of properties 129   129  
Harborside Plaza 4-A Agreement [Member]
        
Project period (years)     20  
Percentage of PILOT on project cost     2.00%  
Total project cost     49,500,000  
Payments in lieu of property taxes (PILOT) 247,000 407,000 742,000 958,000
Harborside Plaza 5 Agreement [Member]
        
Project period (years)     20  
Percentage of PILOT on project cost     2.00%  
Total project cost     170,900,000  
Payments in lieu of property taxes (PILOT) $ 854,000 $ 1,300,000 $ 2,600,000 $ 3,000,000