Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Options) (Details)

v3.4.0.3
Stock-Based Compensation (Options) (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Options    
Outstanding at the beginning of the period (in shares) 3,533,791  
Granted (in shares) 105,645  
Exercised (in shares) (152,220)  
Forfeited (in shares) (38,777)  
Outstanding at the end of the period (in shares) 3,448,439 3,533,791
Options exercisable (in shares) 3,111,018  
Weighted-Average Exercise Price    
Outstanding at the beginning of the period (in dollars per share) $ 15.03  
Granted (in dollars per share) 20.51  
Exercised (in dollars per share) 7.93  
Forfeited (in dollars per share) 35.93  
Outstanding at the end of the period (in dollars per share) 15.27 $ 15.03
Options exercisable (in dollars per share) $ 12.97  
Weighted-Average Remaining Contractual Life    
Outstanding 4 years 8 months 12 days 4 years 8 months 12 days
Options exercisable 4 years 2 months 12 days  
Aggregate Intrinsic Value    
Outstanding (in dollars) $ 50,987 $ 61,199
Options exercisable (in dollars) 50,188  
Additional disclosures    
Unrecognized stock-based compensation expense related to unvested stock options $ 4,570  
Unrecognized compensation expense weighted-average recognition period 2 years 2 months 12 days  
Minimum    
Additional disclosures    
Exercise prices of stock options outstanding (in dollars per share) $ 0.11  
Maximum    
Additional disclosures    
Exercise prices of stock options outstanding (in dollars per share) $ 55.29