EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator for basic and diluted earnings per share:
Net income	$ 136,346	$ 98,645	$ 116,243	$ 97,204	$ 120,033	$ 102,292	$ 351,234	$ 319,529
Numerator for basic earnings per share	136,346			97,204			351,234	319,529
Numerator for diluted earnings per share	$ 136,346			$ 97,204			$ 351,234	$ 319,529
Denominator:
Weighted average common shares for basic earnings per share (in shares)	56,910			57,853			57,445	57,850
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	515			1,095			721	1,293
Weighted average common shares for diluted earnings per share (in shares)	57,425			58,948			58,166	59,143
Net income per share:
Basic (in usd per share)	$ 2.40			$ 1.68			$ 6.11	$ 5.52
Diluted (in usd per share)	$ 2.37			$ 1.65			$ 6.04	$ 5.40
Anti-dilutive options not included in the calculation (in shares)	1,426			452			1,056	410