EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator for basic and diluted earnings per share:
Net income	$ 97,204	$ 120,033	$ 102,292	$ 156,054	$ 18,604	$ 89,719	$ 319,529	$ 264,377
Numerator for basic earnings per share	97,204			156,054			319,529	264,377
Numerator for diluted earnings per share	$ 97,204			$ 156,054			$ 319,529	$ 264,377
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,853			57,420			57,850	57,194
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	1,095			1,937			1,293	1,914
Weighted average common shares for diluted earnings per share (in shares)	58,948			59,357			59,143	59,108
Net income per share:
Basic (in usd per share)	$ 1.68			$ 2.72			$ 5.52	$ 4.62
Diluted (in usd per share)	$ 1.65			$ 2.63			$ 5.40	$ 4.47
Anti-dilutive options not included in the calculation (in shares)	452			158			410	252