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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock option activity        
Options outstanding (in shares)     232,870  
Options exercised (in shares)     (63,900)  
Options forfeited (in shares)     4,000  
Options outstanding (in shares) 164,970   164,970  
Options vested or expected to vest (in shares) 164,970   164,970  
Options exercisable (in shares) 164,970   164,970  
Stock option activity, weighted average exercise price        
Options Outstanding, weighted average exercise price (in dollars per share)     $ 9.13  
Options exercised, weighted average exercise price (in dollars per share)     10.00  
Options forfeited, weighted average exercise price (in dollars per share)     11.25  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.74   8.74  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 8.74   8.74  
Options exercisable, weighted average exercise price (in dollars per share) $ 8.74   $ 8.74  
Options outstanding, weighted average remaining contractual term     3 years 3 months 20 days  
Options vested or expected to vest, weighted average remaining contractual term     3 years 3 months 20 days  
Options exercisable, weighted average remaining contractual term     3 years 3 months 20 days  
Options outstanding, aggregate intrinsic value $ 2,049   $ 2,049  
Options vested or expected to vest, aggregate intrinsic value 2,049   2,049  
Options exercisable, aggregate intrinsic value 2,049   2,049  
Intrinsic value of options exercised 129 $ 404 652 $ 951
Cash received from options exercised 90 202 639 466
Excess tax benefit realized for options exercises $ 33 $ 10 $ 139 $ 104