EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator for basic and diluted earnings per share:
Net income	$ 419,416	$ 481,652	$ 327,160
Numerator for basic	419,416	481,652	327,160
Numerator for diluted	$ 419,416	$ 481,652	$ 327,160
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,291	56,511	55,727
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	1,878	2,553	2,719
Weighted average common shares for diluted earnings per share	59,169	59,064	58,446
Net Income per share:
Basic (in dollars per share)	$ 7.32	$ 8.52	$ 5.87
Diluted (in dollars per share)	$ 7.09	$ 8.15	$ 5.60
Anti-dilutive stock excluded from the calculation (in shares)	264	32	40