Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Options) (Details)

v3.7.0.1
Stock-Based Compensation (Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Weighted-Average Remaining Contractual Life        
Outstanding   4 years 6 months    
Stock options        
Options        
Outstanding at the beginning of the period (in shares) 2,891,036 3,033,194 3,033,194  
Granted (in shares)   75,238    
Exercised (in shares) (84,949) (208,334)    
Forfeited (in shares) (1,667) (9,062)    
Outstanding at the end of the period (in shares) 2,804,420 2,891,036 2,804,420 3,033,194
Options exercisable (in shares) 2,549,439   2,549,439  
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 17.15 $ 16.33 $ 16.33  
Granted (in dollars per share)   31.70    
Exercised (in dollars per share) 8.46 9.12    
Forfeited (in dollars per share) 32.46 45.81    
Outstanding at the end of the period (in dollars per share) 17.41 $ 17.15 17.41 $ 16.33
Options exercisable (in dollars per share) $ 15.85   $ 15.85  
Weighted-Average Remaining Contractual Life        
Outstanding 4 years 3 months 18 days     4 years 3 months 18 days
Options exercisable 3 years 9 months 18 days      
Aggregate Intrinsic Value        
Outstanding (in dollars) $ 66,206 $ 50,792 $ 66,206 $ 63,264
Options exercisable (in dollars) 63,824   63,824  
Additional disclosures        
Unrecognized stock-based compensation expense related to unvested stock options $ 2,956   $ 2,956  
Unrecognized compensation expense weighted-average recognition period     1 year 10 months 24 days  
Stock options | Minimum        
Additional disclosures        
Exercise prices of stock options outstanding (in dollars per share) $ 0.11   $ 0.11  
Stock options | Maximum        
Additional disclosures        
Exercise prices of stock options outstanding (in dollars per share) $ 55.29   $ 55.29