CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 39,839	$ 49,970
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:
Unrealized gain (loss) on available-for-sale securities, net of tax of ($733) and $1,097, respectively	2,627	(3,935)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of ($71) and ($143), respectively	253	509
Change in cumulative foreign currency translation adjustment	95	(234)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	2,975	(3,660)
COMPREHENSIVE INCOME	$ 42,814	$ 46,310