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Acquisitions and Dispositions (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Proceeds from land and depreciated property sales, net $ 112,559 $ 504,688
Other 2012 Acquisitions [Member] [Domain]
   
Total acquired assets 346,051  
Real estate assets 292,754  
Lease-related intangible assets 50,468  
Number of real estate properties acquired 18  
Weighted average remaining life of property (years) 11 years 1 month  
Medical Office Properties [Member] | Other 2012 Acquisitions [Member] [Domain]
   
Number of real estate properties acquired 12  
Columbus Ohio [Member] | Industrial [Member] | Other 2012 Acquisitions [Member] [Domain]
   
Number of real estate properties acquired 2  
Chicago Illinois [Member] | Industrial [Member] | Other 2012 Acquisitions [Member] [Domain]
   
Number of real estate properties acquired 2  
Southern California [Member] | Industrial [Member] | Other 2012 Acquisitions [Member] [Domain]
   
Number of real estate properties acquired 1  
Atlanta Georgia [Member] | Industrial [Member] | Other 2012 Acquisitions [Member] [Domain]
   
Number of real estate properties acquired 1  
Purchase Accounting Provisional [Domain] | Other 2012 Acquisitions [Member] [Domain]
   
Total acquired assets 90,100  
Real estate assets 69,200  
Lease-related intangible assets $ 20,900