Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

v2.4.0.8
Stock-Based Compensation (Details 3) (Stock Options, USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2013
Stock Options
        
Options        
Balance at the beginning of the period (in shares) 5,185,307 5,450,725 5,277,412 5,277,412
Granted (in shares)     190,413  
Exercised (in shares) (363,574) (233,603) (9,050)  
Forfeited (in shares) (31,275) (31,815) (8,050)  
Balance at the end of the period (in shares) 4,790,458 5,185,307 5,450,725 4,790,458
Options exercisable (in shares) 3,515,090     3,515,090
Weighted-Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 9.06 $ 9.08 $ 8.86 $ 8.86
Granted (in dollars per share)     $ 15.34  
Exercised (in dollars per share) $ 9.28 $ 9.13 $ 6.24  
Forfeited (in dollars per share) $ 11.38 $ 12.41 $ 11.91  
Balance at the end of the period (in dollars per share) $ 9.03 $ 9.06 $ 9.08 $ 9.03
Options exercisable (in dollars per share) $ 8.03     $ 8.03
Weighted-Average Remaining Contractual Life        
Outstanding 5 years 7 months 6 days 6 years 6 years 2 months 12 days  
Options exercisable 4 years 9 months 18 days      
Aggregate Intrinsic Value        
Outstanding (in dollars) $ 105,267 $ 80,583 $ 45,939 $ 105,267
Options exercisable (in dollars) $ 80,727     $ 80,727
Additional disclosures        
Exercise prices of stock options outstanding, lower range (in dollars per share)       $ 0.11
Exercise prices of stock options outstanding, upper range (in dollars per share)       $ 15.34