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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock option activity    
Options outstanding (in shares) 154,440  
Options exercised (in shares) (13,636)  
Options forfeited (in shares) (1,000)  
Options outstanding (in shares) 139,804  
Options vested or expected to vest (in shares) 139,804  
Options exercisable (in shares) 139,804  
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.68  
Options exercised, weighted average exercise price (in dollars per share) 6.94  
Options forfeited, weighted average exercise price (in dollars per share) 5.06  
Options Outstanding, weighted average exercise price (in dollars per share) 8.87  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 8.87  
Options exercisable, weighted average exercise price (in dollars per share) $ 8.87  
Options outstanding, weighted average remaining contractual term 2 years 8 months 30 days  
Options vested or expected to vest, weighted average remaining contractual term 2 years 8 months 30 days  
Options exercisable, weighted average remaining contractual term 2 years 8 months 30 days  
Options outstanding, aggregate intrinsic value $ 1,493  
Options vested or expected to vest, aggregate intrinsic value 1,493  
Options exercisable, aggregate intrinsic value 1,493  
Intrinsic value of options exercised 167 $ 524
Cash received from options exercised 95 549
Excess tax benefit realized for options exercises $ 17 $ 119