EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator for basic and diluted earnings per share:
Net income	$ 102,292	$ 89,719
Numerator for basic earnings per share	102,292	89,719
Numerator for diluted earnings per share	$ 102,292	$ 89,719
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,702	56,915
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	1,596	2,026
Weighted average common shares for diluted earnings per share (in shares)	59,298	58,941
Net income per share:
Basic (in usd per share)	$ 1.77	$ 1.58
Diluted (in usd per share)	$ 1.73	$ 1.52
Anti-dilutive options not included in the calculation (in shares)	260	137