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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock option activity    
Options outstanding (in shares) 380,430  
Options exercised (in shares) (1,500)  
Options cancelled (in shares) (620)  
Options outstanding (in shares) 378,310  
Options vested or expected to vest (in shares) 372,998  
Options exercisable (in shares) 279,490  
Stock option activity, weighted average exercise price    
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.83  
Options exercised, weighted average exercise price (in dollars per share) $ 6.52  
Options canceled, weighted average exercise price (in dollars per share) $ 7.80  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.84  
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.86  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.37  
Options outstanding, weighted average remaining contractual term 4 years 4 months 45 days  
Options vested or expected to vest, weighted average remaining contractual term 4 years 4 months 27 days  
Options exercisable, weighted average remaining contractual term 3 years 2 months 25 days  
Options outstanding, aggregate intrinsic value $ 1,236  
Options vested or expected to vest, aggregate intrinsic value 1,214  
Options exercisable, aggregate intrinsic value 825  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 7 2
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 10 $ 4