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Subsequent Events (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2011
properties
TypesOfFinancing
shareholders
tenants
ClassesOfFinancing
Sep. 30, 2010
properties
tenants
Subsequent Event [Line Items]  
Real Estate Number Of Properties Sold149
Acquisition [Member]
  
Subsequent Event [Line Items]  
Square Feet475,000 
Property Purchase Price$ 12,110 
Lease Term (Years)15 
Disposal [Member]
  
Subsequent Event [Line Items]  
Real Estate Number Of Properties Sold1 
Real Estate Disposition Price$ 7,500