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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
NET INCOME $ 51,516 $ 53,455 $ 141,033 $ 144,927
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:        
Unrealized gain (loss) on available-for-sale securities, net of tax of ($318), $572, ($756) and $2,120, respectively 1,138 (1,680) 2,706 (7,231)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of ($71), ($159), ($212) and ($444), respectively 253 493 759 1,511
Change in cumulative foreign currency translation adjustment (44) (191) 22 (601)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 1,347 (1,378) 3,487 (6,321)
COMPREHENSIVE INCOME $ 52,863 $ 52,077 $ 144,520 $ 138,606