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Stock-based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Options outstanding  
Number of shares 3,358,408
Weighted-average remaining life 7 years 3 months
Options exercisable and vested  
Number of shares 2,238,265
Weighted-average remaining life 7 years 2 months 23 days
Stock Options
 
Stock-based compensation expense  
Unrecognized compensation cost 2.4
Weighted-average period of recognition of unrecognized stock-based compensation cost 1 year
$20.00
 
Stock options outstanding and exercisable and vested by exercise price range  
Exercise price (in dollars per share) 20.00
Options outstanding  
Number of shares 3,208,408
Weighted-average remaining life 7 years 2 months 16 days
Options exercisable and vested  
Number of shares 2,188,265
Weighted-average remaining life 7 years 2 months 16 days
$28.80
 
Stock options outstanding and exercisable and vested by exercise price range  
Exercise price (in dollars per share) 28.80
Options outstanding  
Number of shares 150,000
Weighted-average remaining life 8 years 25 days
Options exercisable and vested  
Number of shares 50,000
Weighted-average remaining life 8 years 25 days