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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Stock option activity  
Options outstanding (in shares) 499,289
Options exercised (in shares) (92,199)
Options cancelled (in shares) (25,470)
Options outstanding (in shares) 381,620
Options vested or expected to vest (in shares) 376,118
Options exercisable (in shares) 278,820
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) $ 8.48
Options canceled, weighted average exercise price (in dollars per share) $ 9.15
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.82
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.83
Options exercisable, weighted average exercise price (in dollars per share) $ 9.38
Options outstanding, weighted average remaining contractual term 4 years 11 months 14 days
Options vested or expected to vest, weighted average remaining contractual term 4 years 10 months 28 days
Options exercisable, weighted average remaining contractual term 3 years 8 months 25 days
Options outstanding, aggregate intrinsic value $ 889
Options vested or expected to vest, aggregate intrinsic value 874
Options exercisable, aggregate intrinsic value $ 597