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Subsequent Events - Management Agreement (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended 92 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Subsequent Event [Line Items]          
Shares Issued (in shares)         41,956,000
Proceeds from Issuance of common stock   $ 150,691 $ 482 $ 120,839  
Subsequent Event          
Subsequent Event [Line Items]          
Shares Issued (in shares) 460,738        
Weighted average price of shares issued (in dollars per share) $ 22.62        
Proceeds from Issuance of common stock $ 10,400