Stock-based Compensation (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2013
Options exercisable and vested
Number of Shares	3,357,658
Weighted-Average Remaining Life	6 years 8 months 12 days
$20.00
Stock options outstanding and exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 20.00
Options exercisable and vested
Number of Shares	3,207,658
Weighted-Average Remaining Life	6 years 8 months 12 days
$28.80
Stock options outstanding and exercisable and vested by exercise price range
Exercise price (in dollars per share)	$ 28.80
Options exercisable and vested
Number of Shares	150,000
Weighted-Average Remaining Life	7 years 7 months 6 days