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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock option activity        
Options outstanding (in shares)     154,440  
Options exercised (in shares)     (21,820)  
Options forfeited (in shares)     (1,000)  
Options outstanding (in shares) 131,620   131,620  
Options vested or expected to vest (in shares) 131,620   131,620  
Options exercisable (in shares) 131,620   131,620  
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)     7.36  
Options forfeited, weighted average exercise price (in dollars per share)     5.06  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.92   8.92  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 8.92   8.92  
Options exercisable, weighted average exercise price (in dollars per share) $ 8.92   $ 8.92  
Options outstanding, weighted average remaining contractual term     2 years 6 months 30 days  
Options vested or expected to vest, weighted average remaining contractual term     2 years 6 months 30 days  
Options exercisable, weighted average remaining contractual term     2 years 6 months 30 days  
Options outstanding, aggregate intrinsic value $ 1,652   $ 1,652  
Options vested or expected to vest, aggregate intrinsic value 1,652   1,652  
Options exercisable, aggregate intrinsic value 1,652   1,652  
Intrinsic value of options exercised 98 $ 129 265 $ 652
Cash received from options exercised 65 91 160 640
Excess tax benefit realized for options exercises $ 8 $ 33 $ 25 $ 139