EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic earnings per share:
Net income	$ 42,034	$ 14,820	$ 123,713	$ 43,898
Weighted-average common shares	60,319	59,823	60,350	59,582
Basic earnings per share	$ 0.70	$ 0.25	$ 2.05	$ 0.74
Diluted earnings per share:
Net income	$ 42,034	$ 14,820	$ 123,713	$ 43,898
Weighted-average common shares	60,319	59,823	60,350	59,582
Effect of dilutive awards:
Employee stock plans	1,044	1,029	1,116	1,086
Diluted weighted-average common shares	61,363	60,852	61,466	60,668
Diluted earnings per share	$ 0.69	$ 0.24	$ 2.01	$ 0.72
Stock awards excluded in the computation of diluted earnings per share	0	0	0	0