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Share-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Stock option activity  
Options outstanding (in shares) 499,289
Options exercised (in shares) (93,329)
Options forfeited (in shares) (25,530)
Options outstanding (in shares) 380,430
Options vested or expected to vest (in shares) 375,055
Options exercisable (in shares) 278,890
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) $ 8.45
Options canceled, weighted average exercise price (in dollars per share) $ 9.15
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.83
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.85
Options exercisable, weighted average exercise price (in dollars per share) $ 9.38
Options outstanding, weighted average remaining contractual term 4 years 8 months 15 days
Options vested or expected to vest, weighted average remaining contractual term 4 years 7 months 29 days
Options exercisable, weighted average remaining contractual term 3 years 5 months 25 days
Options outstanding, aggregate intrinsic value $ 1,176
Options vested or expected to vest, aggregate intrinsic value 2,928
Options exercisable, aggregate intrinsic value $ 776