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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Stock option activity    
Options outstanding (in shares) 380,430  
Options exercised (in shares) (4,340)  
Options cancelled (in shares) (620)  
Options outstanding (in shares) 375,470  
Options vested or expected to vest (in shares) 370,178  
Options exercisable (in shares) 276,850  
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) $ 5.86  
Options canceled, weighted average exercise price (in dollars per share) $ 7.80  
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) $ 8.89  
Options exercisable, weighted average exercise price (in dollars per share) $ 9.40  
Options outstanding, weighted average remaining contractual term 4 years 2 months 11 days  
Options vested or expected to vest, weighted average remaining contractual term 4 years 1 month 24 days  
Options exercisable, weighted average remaining contractual term 2 years 9 months 85 days  
Options outstanding, aggregate intrinsic value $ 1,632  
Options vested or expected to vest, aggregate intrinsic value 1,602  
Options exercisable, aggregate intrinsic value 1,067  
Intrinsic value of options exercised 24 73
Cash received from options exercised 25 773
Excess tax benefit realized for option exercises $ 6 $ 16