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STOCK-BASED COMPENSATION - Combined Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Options outstanding, beginning of period (shares) | shares 7,436
Granted (shares) | shares 2,018
Exercised (shares) | shares (1,777)
Forfeited (shares) | shares (286)
Options outstanding, end of period (shares) | shares 7,391
Vested and expected to vest (shares) | shares 6,225
Exercisable (shares) | shares 2,935
Weighted-average Exercise Price  
Options outstanding, beginning of period (dollars per share) | $ / shares $ 44.76
Granted (dollars per share) | $ / shares 92.81
Exercised (dollars per share) | $ / shares 33.52
Forfeited (dollars per share) | $ / shares 62.86
Options outstanding, end of period (dollars per share) | $ / shares 59.88
Vested and expected to vest (dollars per share) | $ / shares 57.85
Exercisable (dollars per share) | $ / shares $ 38.73
Weighted-average remaining contractual term  
Vested and expected to vest 7 years 1 month 6 days
Exercisable 5 years 7 months 6 days
Aggregate intrinsic value  
Vested and expected to vest | $ $ 469,374
Exercisable | $ $ 277,450