Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Options) (Details)

v3.5.0.2
Stock-Based Compensation (Options) (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Options          
Outstanding at the beginning of the period (in shares) 3,383,899 3,448,439 3,533,791 3,533,791  
Granted (in shares) 2,500 55,719 105,645    
Exercised (in shares) (99,957) (96,068) (152,220)    
Forfeited (in shares) (3,111) (24,191) (38,777)    
Outstanding at the end of the period (in shares) 3,283,331 3,383,899 3,448,439 3,283,331 3,533,791
Options exercisable (in shares) 2,922,108     2,922,108  
Weighted-Average Exercise Price          
Outstanding at the beginning of the period (in dollars per share) $ 15.43 $ 15.27 $ 15.03 $ 15.03  
Granted (in dollars per share) 38.05 31.03 20.51    
Exercised (in dollars per share) 8.88 11.17 7.93    
Forfeited (in dollars per share) 45.51 33.35 35.93    
Outstanding at the end of the period (in dollars per share) 15.62 $ 15.43 $ 15.27 15.62 $ 15.03
Options exercisable (in dollars per share) $ 13.22     $ 13.22  
Weighted-Average Remaining Contractual Life          
Outstanding 4 years 3 months 18 days 4 years 6 months 4 years 8 months 12 days   4 years 8 months 12 days
Options exercisable 3 years 9 months 18 days        
Aggregate Intrinsic Value          
Outstanding (in dollars) $ 73,756 $ 67,219 $ 50,987 $ 73,756 $ 61,199
Options exercisable (in dollars) 71,331     71,331  
Additional disclosures          
Unrecognized stock-based compensation expense related to unvested stock options $ 3,665     $ 3,665  
Unrecognized compensation expense weighted-average recognition period       1 year 10 months 24 days  
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