Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details 3)

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Stock-Based Compensation (Details 3) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Options      
Outstanding at the beginning of the period (in shares) 3,988,561 4,265,337 4,265,337
Granted (in shares) 123,410 148,677  
Exercised (in shares) (271,004) (415,512)  
Forfeited (in shares) (28,403) (9,941)  
Outstanding at the end of the period (in shares) 3,812,564 3,988,561 3,812,564
Options exercisable (in shares) 3,469,757   3,469,757
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 12.50 $ 10.73 $ 10.73
Granted (in dollars per share) 52.67 54.02  
Exercised (in dollars per share) 8.12 8.93  
Forfeited (in dollars per share) 46.07 24.94  
Outstanding at the end of the period (in dollars per share) 13.86 $ 12.50 13.86
Options exercisable (in dollars per share) $ 11.03   $ 11.03
Weighted-Average Remaining Contractual Life      
Outstanding 4 years 9 months 18 days 4 years 9 months 18 days  
Options exercisable 4 years 4 months 24 days    
Aggregate Intrinsic Value      
Outstanding (in dollars) $ 105,196 $ 173,837 $ 105,196
Options exercisable (in dollars) $ 103,576   $ 103,576
Minimum      
Additional disclosures      
Exercise prices of stock options outstanding (in dollars per share) $ 0.11   $ 0.11
Maximum      
Additional disclosures      
Exercise prices of stock options outstanding (in dollars per share) $ 55.29   $ 55.29