CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 49,970	$ 51,687
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:
Unrealized loss on available-for-sale securities, net of tax of $1,097 and $17, respectively	(3,935)	(58)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $143, and $335, respectively	509	1,174
Change in cumulative foreign currency translation adjustment	(234)	(106)
TOTAL OTHER COMPREHENSIVE (LOSS) INCOME	(3,660)	1,010
COMPREHENSIVE INCOME	$ 46,310	$ 52,697