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Subsequent Events (Details)
$ / shares in Units, ft² in Thousands, $ in Thousands
9 Months Ended
Oct. 30, 2018
$ / shares
Oct. 25, 2018
USD ($)
ft²
a
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Subsequent Event [Line Items]        
Payments to acquire real estate     $ 28,176 $ 0
Subsequent Event        
Subsequent Event [Line Items]        
Dividends declared (in dollars per share) | $ / shares $ 0.21      
9320 Excelsior Boulevard | Subsequent Event        
Subsequent Event [Line Items]        
Payments to acquire real estate   $ 49,400    
Square footage of real estate property | ft²   268    
Acreage of real estate acquired | a   5.84    
Percent of real estate acquired leased   100.00%