Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

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Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Shares      
Balance at the beginning of the period (in shares) 5,450,725 5,277,412 5,277,412
Granted (in shares)   190,413  
Exercised (in shares) (233,603) (9,050)  
Forfeited (in shares) (31,815) (8,050)  
Balance at the end of the period (in shares) 5,185,307 5,450,725 5,185,307
Options exercisable (in shares) 3,440,826   3,440,826
Weighted-Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 9.08 $ 8.86 $ 8.86
Granted (in dollars per share)   $ 15.34  
Exercised (in dollars per share) $ 9.13 $ 6.24  
Forfeited (in dollars per share) $ 12.41 $ 11.91  
Balance at the end of the period (in dollars per share) $ 9.06 $ 9.08 $ 9.06
Options exercisable (in dollars per share) $ 8.04   $ 8.04
Weighted-Average Remaining Contractual Life      
Outstanding 6 years 6 years 2 months 12 days  
Options exercisable 4 years 10 months 24 days    
Aggregate Intrinsic Value      
Outstanding (in dollars) $ 80,583 $ 45,939 $ 80,583
Options exercisable (in dollars) $ 56,991   $ 56,991
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