EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator for basic and diluted earnings per share:
Net income	$ 98,645	$ 116,243	$ 120,033	$ 102,292	$ 214,888	$ 222,325
Numerator for basic earnings per share	98,645		120,033		214,888	222,325
Numerator for diluted earnings per share	$ 98,645		$ 120,033		$ 214,888	$ 222,325
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,594		57,993		57,716	57,848
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	555		1,188		824	1,392
Weighted average common shares for diluted earnings per share (in shares)	58,149		59,181		58,540	59,240
Net income per share:
Basic (in usd per share)	$ 1.71		$ 2.07		$ 3.72	$ 3.84
Diluted (in usd per share)	$ 1.70		$ 2.03		$ 3.67	$ 3.75
Anti-dilutive options not included in the calculation (in shares)	1,379		519		871	389