EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator for basic and diluted earnings per share:
Net income	$ 156,054	$ 18,604	$ 89,719	$ 115,656	$ 114,671	$ 109,046	$ 264,377	$ 339,373
Numerator for basic earnings per share	156,054			115,656			264,377	339,373
Numerator for diluted earnings per share	$ 156,054			$ 115,656			$ 264,377	$ 339,373
Denominator:
Weighted average common shares for basic earnings per share (in shares)	57,420			56,649			57,194	56,429
Net effect of dilutive stock options, restricted stock units, restricted stock awards and stock issuable under the ESPP (in shares)	1,937			2,554			1,914	2,570
Weighted average common shares for diluted earnings per share (in shares)	59,357			59,203			59,108	58,999
Net income per share:
Basic (in usd per share)	$ 2.72			$ 2.04			$ 4.62	$ 6.01
Diluted (in usd per share)	$ 2.63			$ 1.95			$ 4.47	$ 5.75
Anti-dilutive options not included in the calculation (in shares)	158			8			252	35