Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Gale Kimball, L.L.C.) (Details)

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Investments In Unconsolidated Joint Ventures (Gale Kimball, L.L.C.) (Details) (Gale Kimball [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 15, 2006
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Gale Kimball [Member]
       
Schedule of Equity Method Investments [Line Items]        
Percentage of interest in venture       8.33%
Date of acquisition June 15, 2006      
Area of office property       175,000
Venture sale of real estate   $ 60,000,000    
Management, leasing and other services fees   262,000 234,000  
Share of gain on sale of real estate   1,600,000    
Venture gain (loss) on sale of real estate   19,800,000    
Distribution received   5,400,000    
Payment of Participation Rights   $ 2,400,000