STOCK PLANS - Stock Option Activity (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Options
Balance at the beginning of the period (in shares)	6,235,118	6,706,378	5,722,818
Granted (in shares)	890,277	1,502,803	1,872,758
Exercised (in shares)	(732,117)	(1,428,111)	(425,495)
Forfeited (in shares)	(278,233)	(426,925)	(286,779)
Expired (in shares)	(64,505)	(119,027)	(176,924)
Balance at the end of the period (in shares)	6,050,540	6,235,118	6,706,378	5,722,818
Exercisable at the end of the period (in shares)	3,826,646
Vested and expected to vest at the end of the period (in shares)	6,050,540
Weighted Average Exercise Price (Per Share)
Balance at the beginning of the period (in dollars per share)	$ 45.98	$ 42.80	$ 41.69
Granted (in dollars per share)	60.27	47.50	42.75
Exercised (in dollars per share)	32.56	31.67	19.90
Forfeited (in dollars per share)	46.46	42.08	39.22
Expired (in dollars per share)	80.31	71.71	63.33
Balance at the end of the period (in dollars per share)	49.32	$ 45.98	$ 42.80	$ 41.69
Exercisable at the end of the period (in dollars per share)	48.38
Vested and expected to vest at the end of the period (in dollars per share)	$ 49.32
Weighted Average Remaining Contractual Term (Years)
Term at the end of the period (in years)	6 years 7 months 2 days	6 years 11 months 19 days	7 years 18 days	7 years 25 days
Term exercisable at the end of the period (in years)	5 years 5 months 26 days
Term vested and expected to vest at the end of the period (in years)	6 years 7 months 2 days
Aggregate Intrinsic Value (in Thousands)
Balance at the beginning of the period	$ 102,955	$ 50,652	$ 49,166
Exercised	23,967	34,227	9,441
Balance at the end of the period	81,407	$ 102,955	$ 50,652	$ 49,166
Exercisable at the end of the period	59,972
Vested and expected to vest at the end of the period	$ 81,407