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Subsequent Events - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Nov. 10, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Subsequent Event [Line Items]        
Issuance of shares for distribution reinvestment plan   $ 16,546 $ 10,212 $ 0
Subsequent Event | Distribution Reinvestment Plan        
Subsequent Event [Line Items]        
Issuance of shares for distribution reinvestment plan (shares) 4,046,185      
Issuance of shares for distribution reinvestment plan $ 38,200