Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Pro Forma Earnings Per Share - Narrative (Details)

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Stockholders' Equity and Pro Forma Earnings Per Share - Narrative (Details) - USD ($)
12 Months Ended
Oct. 19, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsidiary, Sale of Stock [Line Items]        
Proceeds from initial public offering   $ 105,838,750 $ 0 $ 0
Common stock, shares authorized   200,000,000 200,000,000  
Common stock, par or stated value per share   $ 0.01 $ 0.01  
IPO        
Subsidiary, Sale of Stock [Line Items]        
Shares issued 7,750,000      
Proceeds from initial public offering $ 103,100,000      
Sale of stock, price per share (in USD per share) $ 15.00      
Over-Allotment Option        
Subsidiary, Sale of Stock [Line Items]        
Shares issued 7,500,000