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Acquisitions and Dispositions - Dispositions (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
$ in Thousands
12 Months Ended
Dec. 18, 2017
USD ($)
ft²
buildings
Aug. 15, 2017
USD ($)
Apr. 07, 2017
USD ($)
buildings
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Georgia Portfolio            
Business Acquisition [Line Items]            
Number of medical office buildings | buildings     4      
Proceeds from divestiture of businesses     $ 18,200      
Revenue       $ 823 $ 1,967 $ 1,666
Income before gain on sale of investment properties       108 433 421
Gain on sale of investment properties     $ 5,200 5,870 0 0
Net income       $ 5,978 $ 433 $ 421
Peachtree Dunwoody Medical Center            
Business Acquisition [Line Items]            
Land   $ 7,700        
Term of contract   90 years        
Nebraska            
Business Acquisition [Line Items]            
Number of medical office buildings | buildings 1          
Square feet of building being disposed | ft² 20,939          
Proceeds from divestiture of businesses $ 2,500          
Gain on sale of investment properties $ 700