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Risk Management (Tables)
 6 Months Ended
Jun. 30, 2011
Portfolio Concentration Risk [Abstract]  
Portfolio Concentration Risk
Region:    At June 30, 2011
Texas    17%
California   16%
Tennessee    12%
Georgia    9%
Other U.S.    36%
Total U.S.    90%
Total Europe    10%
Total    100%
      
Asset Type:     
Office    42%
Industrial    29%
Warehouse/Distribution    15%
Other    14%
Total    100%
      
Tenant Industry:     
Business and commercial services    17%
Retail stores    12%
Other    71%
Total    100%