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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, 2013
Stock option activity  
Options outstanding (in shares) 499,289
Options exercised (in shares) (90,854)
Options cancelled (in shares) (21,380)
Options outstanding (in shares) 387,055
Options vested or expected to vest (in shares) 379,784
Options exercisable (in shares) 251,555
Stock option activity, weighted average exercise price  
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.78
Options exercised, weighted average exercise price (in dollars per share) $ 8.51
Options canceled, weighted average exercise price (in dollars per share) $ 8.83
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) $ 8.87
Options exercisable, weighted average exercise price (in dollars per share) $ 9.70
Options outstanding, weighted average remaining contractual term 5 years 2 months 7 days
Options vested or expected to vest, weighted average remaining contractual term 5 years 1 month 16 days
Options exercisable, weighted average remaining contractual term 3 years 5 months 3 days
Options outstanding, aggregate intrinsic value $ 879
Options vested or expected to vest, aggregate intrinsic value 333
Options exercisable, aggregate intrinsic value $ 493