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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, 2012
Stock option activity  
Options outstanding (in shares) 511,019
Options granted (in shares) 92,150
Options exercised (in shares) (69,030)
Options forfeited (in shares) (34,850)
Options outstanding (in shares) 499,289
Options vested or expected to vest (in shares) 491,705
Options exercisable (in shares) 358,279
Stock option activity, weighted average exercise price  
Options granted, weighted average exercise price of options granted in period (in dollars per share) $ 8.03
Options exercised, weighted average exercise price (in dollars per share) $ 5.59
Options canceled, weighted average exercise price (in dollars per share) $ 9.91
Options Outstanding, weighted average exercise price (in dollars per share) $ 8.78
Options vested or expected to vest, weighted average exercise price (in dollars per share) $ 8.80
Options exercisable, weighted average exercise price (in dollars per share) $ 9.40
Options outstanding, weighted average remaining contractual term 4 years 7 months 10 days
Options vested or expected to vest, weighted average remaining contractual term 4 years 6 months 18 days
Options exercisable, weighted average remaining contractual term 2 years 10 months 28 days
Options outstanding, aggregate intrinsic value $ 284
Options vested or expected to vest, aggregate intrinsic value 186
Options exercisable, aggregate intrinsic value $ 181