EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic earnings per share:
NET INCOME		$ 14,820	$ 17,099	$ 43,898	$ 35,177
Weighted-average common shares	[1]	59,823,000	58,770,000	59,582,000	58,426,000
Basic earnings per share	[1]	$ 0.25	$ 0.29	$ 0.74	$ 0.60
Diluted earnings per share:
NET INCOME		$ 14,820	$ 17,099	$ 43,898	$ 35,177
Weighted-average common shares	[1]	59,823,000	58,770,000	59,582,000	58,426,000
Effect of dilutive awards:
Employee stock plans		1,029,000	962,000	1,086,000	992,000
Diluted weighted-average common shares	[1]	60,852,000	59,732,000	60,668,000	59,418,000
Diluted earnings per share	[1],[2]	$ 0.24	$ 0.29	$ 0.72	$ 0.59
Stock awards excluded in the computation of diluted earnings per share		0	0	0	0

[1] The Earnings Per Share and Shares Used in Per Share Calculation information presented above reflects the effect of the August 2020 stock split. Refer to Note 9, Earnings Per Share, in this Form 10-Q for details.

[2] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2020 and 2019 calculations as the shares were not contingently issuable as of the end of the reporting periods.