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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock option activity        
Options outstanding (in shares)     232,870  
Options exercised (in shares)     (71,470)  
Options forfeited (in shares)     (4,000)  
Options outstanding (in shares) 157,400   157,400  
Options vested or expected to vest (in shares) 157,400   157,400  
Options exercisable (in shares) 157,400   157,400  
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)     10.04  
Options forfeited, weighted average exercise price (in dollars per share)     11.25  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.66   8.66  
Options vested or expected to vest, weighted average exercise price (in dollars per share) 8.66   8.66  
Options exercisable, weighted average exercise price (in dollars per share) $ 8.66   $ 8.66  
Options outstanding, weighted average remaining contractual term     3 years 26 days  
Options vested or expected to vest, weighted average remaining contractual term     3 years 26 days  
Options exercisable, weighted average remaining contractual term     3 years 26 days  
Options outstanding, aggregate intrinsic value $ 2,038   $ 2,038  
Options vested or expected to vest, aggregate intrinsic value 2,038   2,038  
Options exercisable, aggregate intrinsic value 2,038   2,038  
Intrinsic value of options exercised 83 $ 13 736 $ 964
Cash received from options exercised 79 7 719 473
Excess tax benefit realized for options exercises $ 3 $ 0 $ 142 $ 104