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SHARE OPTION PLANS AND ESPP - Schedule of RSUs and PSUs (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
RSUs/PSUs  
Number of RSU/PSUs  
Unvested at beginning of year (in shares) 4,459,107
Granted (in shares) 964,555
Vested (in shares) (412,175)
Forfeited and cancelled (in shares) (15,928)
Unvested at ending of year (in shares) 4,995,559
Weighted average grant date fair value  
Unvested at beginning of year (in usd per share) | $ / shares $ 65.56
Granted (in usd per share) | $ / shares 80.59
Vested (in usd per share) | $ / shares 84.05
Forfeited and cancelled (in usd per share) | $ / shares 99.97
Unvested at ending of year (in usd per share) | $ / shares $ 66.83
PSUs  
Weighted average grant date fair value  
Number of PSUs (in shares) 3,154,536
Total fair value at grant date | $ $ 171,935
PSUs | Award One  
Weighted average grant date fair value  
Number of PSUs (in shares) 2,703,852
Fair value at grant date per PSU (in usd per share) | $ / shares $ 48.16
Total fair value at grant date | $ $ 130,218
PSUs | Award Two  
Weighted average grant date fair value  
Number of PSUs (in shares) 108,113
Fair value at grant date per PSU (in usd per share) | $ / shares $ 69.37
Total fair value at grant date | $ $ 7,500
PSUs | Award Three  
Weighted average grant date fair value  
Number of PSUs (in shares) 124,701
Fair value at grant date per PSU (in usd per share) | $ / shares $ 80.59
Total fair value at grant date | $ $ 10,050
PSUs | Award Four  
Weighted average grant date fair value  
Number of PSUs (in shares) 17,712
Fair value at grant date per PSU (in usd per share) | $ / shares $ 84.68
Total fair value at grant date | $ $ 1,500
PSUs | Award Five  
Weighted average grant date fair value  
Number of PSUs (in shares) 10,532
Fair value at grant date per PSU (in usd per share) | $ / shares $ 94.94
Total fair value at grant date | $ $ 1,000
PSUs | Award Six  
Weighted average grant date fair value  
Number of PSUs (in shares) 189,626
Fair value at grant date per PSU (in usd per share) | $ / shares $ 114.26
Total fair value at grant date | $ $ 21,667