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Earnings per Share - Additional Information (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share Basic [Line Items]      
Shares outstanding 26,963,517 20,141,630 17,332,775
Stock Options      
Earnings Per Share Basic [Line Items]      
Shares outstanding 1,783,023 1,783,023  
Restricted Stock Award      
Earnings Per Share Basic [Line Items]      
Shares outstanding 70,798 0 0