EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator for basic and diluted earnings per share:
Net income	$ 120,033	$ 102,292	$ 18,604	$ 89,719	$ 222,325	$ 108,323
Numerator for basic earnings per share	120,033		18,604		222,325	108,323
Numerator for diluted earnings per share	$ 120,033		$ 18,604		$ 222,325	$ 108,323
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,993		57,240		57,848	57,078
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	1,188		1,780		1,392	1,903
Weighted average common shares for diluted earnings per share (in shares)	59,181		59,020		59,240	58,981
Net income per share:
Basic (in usd per share)	$ 2.07		$ 0.33		$ 3.84	$ 1.90
Diluted (in usd per share)	$ 2.03		$ 0.32		$ 3.75	$ 1.84
Anti-dilutive options not included in the calculation (in shares)	519		461		389	299