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Stock award plan - Stock Option Activity (Details) - Stock option - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of options      
Outstanding at the beginning of the period (in shares) 11,043,939 8,534,358 6,448,642
Granted (in shares) 2,777,975 3,977,995 3,181,623
Exercised (in shares) (3,268,452) (949,887) (633,973)
Forfeited/Cancelled (in shares) (889,785) (518,527) (461,934)
Outstanding at the end of the period (in shares) 9,663,677 11,043,939 8,534,358
Vested or Expected to vest at the end of the period (in shares) 4,910,488    
Exercisable at the end of the period (in shares) 4,249,063    
Weighted- average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 31.67 $ 28.58 $ 29.00
Granted (in dollars per share) 51.06 35.81 26.64
Exercised (in dollars per share) 24.25 19.25 18.61
Forfeited/Cancelled (in dollars per share) 42.14 35.27 35.36
Outstanding at the end of the period (in dollars per share) 38.72 $ 31.67 $ 28.58
Vested or Expected to vest at the end of the period (in dollars per share) 41.24    
Exercisable at the end of the period (in dollars per share) $ 35.24    
Weighted- average remaining contractual term      
Outstanding at the end of the period 7 years 4 months 13 days    
Vested or Expected to vest at the end of the period 8 years 5 months 26 days    
Exercisable at the end of the period 5 years 11 months 1 day    
Aggregate intrinsic value (in thousands)      
Outstanding at the end of the period (in dollars) $ 218,374    
Vested or Expected to vest at the end of the period (in dollars) 97,320    
Exercisable at the end of the period (in dollars) $ 112,228