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Share-Based Payments - Option Rollforward (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning (in shares) 1,111,274  
Granted (in shares) 193,500  
Expired and canceled (in shares) (29,532)  
Forfeited prior to vesting (in shares) (729)  
Exercise of stock options (in shares) (234,432)  
Outstanding, ending (in shares) 1,040,081 1,111,274
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]    
Weighted average exercise price, outstanding, beginning (in dollars per share) $ 5.15  
Weighted average exercise price, granted (in dollars per share) 8.83  
Weighted average exercise price, expired and canceled (in dollars per share) 6.87  
Weighted average exercise price, forfeited prior to vesting (in dollars per share) 8.88  
Weighted average exercise price, exercised (in dollars per share) 5.72  
Weighted average exercise price, outstanding, ending (in dollars per share) $ 5.65 $ 5.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]    
Vested (in shares) 730,016  
Vested, weighted average exercise price (in dollars per share) $ 4.67  
Vested, weighted average remaining contractual term (in years) 4 years 1 month 24 days  
Vested, aggregate intrinsic value (in dollars) $ 3,721  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, weighted average remaining contractual term (in years) 5 years 7 months 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 4,286  
Weighted average grant date fair value, granted (in dollars per share) $ 4.85 $ 4.38