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Acquisitions and Dispositions - Dispositions (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 15, 2017
USD ($)
Feb. 23, 2017
USD ($)
ft²
buildings
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Peachtree Dunwoody Medical Center [Member]            
Business Acquisition [Line Items]            
Land $ 7,700          
Lease terms P90D          
Georgia Portfolio            
Business Acquisition [Line Items]            
Number of medical office buildings | buildings   4        
Square feet of building being disposed | ft²   80,292        
Proceeds from divestiture of businesses   $ 18,200        
Gain on disposal   $ 5,300 $ 0 $ 0 $ 5,303 $ 0
Revenues     0 425 438 1,259
Income before gain on sale of investment properties:     0 112 87 308
Net income     $ 0 $ 112 $ 5,390 $ 308