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Subsequent Events - Distribution Reinvestment Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 87 Months Ended
Nov. 08, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Subsequent Event [Line Items]          
Proceeds from distribution reinvestment plan     $ 26,342 $ 50,593  
Daily amount of distribution accrued per share (in dollars per share)   $ 0.000924658     $ 0.00184932
Subsequent event          
Subsequent Event [Line Items]          
Number of shares issued (in shares) 0.6        
Proceeds from distribution reinvestment plan $ 4,900        
Daily amount of distribution accrued per share (in dollars per share) $ 0.000924658