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Real Estate Properties (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
property
building
Sep. 30, 2013
Sep. 30, 2014
property
building
Sep. 30, 2013
Dec. 31, 2013
property
building
Real estate properties          
Number of properties that met the criteria for discontinued operations 8   8    
Number of buildings that met the criteria for discontinued operations 11   11    
Income from discontinued operations $ (557) $ 1,231 $ 1,484 $ 3,762  
MOBs
          
Real estate properties          
Number of properties that met the criteria for discontinued operations 1   1   4
Number of buildings that met the criteria for discontinued operations 5   5   7
Rental income 111 2,189 3,837 7,284  
Property operating expenses (668) (958) (2,353) (2,723)  
Depreciation and amortization       (799)  
Income from discontinued operations $ (557) $ 1,231 $ 1,484 $ 3,762  
Discontinued operations, properties sold or held for sale | MOBs
          
Real estate properties          
Number of properties that met the criteria for discontinued operations 4   4    
Number of buildings that met the criteria for discontinued operations 7   7