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Real Estate Properties (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
property
building
Dec. 31, 2012
Dec. 31, 2011
Real estate properties      
Number of properties that met the criteria for discontinued operations 14    
Number of buildings that met the criteria for discontinued operations 17    
Rental income $ 459,380 $ 450,769 $ 412,180
Property operating expenses (299,878) (197,696) (65,400)
Depreciation and amortization (153,026) (139,042) (110,959)
Income from discontinued operations 5,043 4,061 4,113
MOBs
      
Real estate properties      
Number of properties that met the criteria for discontinued operations 4    
Number of buildings that met the criteria for discontinued operations 7    
Discontinued operations, properties sold or held for sale | MOBs
      
Real estate properties      
Number of properties that met the criteria for discontinued operations 4    
Number of buildings that met the criteria for discontinued operations 7    
Rental income 9,451 10,042 9,986
Property operating expenses (3,609) (3,567) (3,567)
Depreciation and amortization (799) (2,414) (2,306)
Income from discontinued operations $ 5,043 $ 4,061 $ 4,113