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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
NET INCOME $ 49,678 $ 41,502 $ 89,517 $ 91,472
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:        
Unrealized (loss) gain on available-for-sale securities, net of tax of $296, $450, ($438) and $1,547, respectively (1,059) (1,616) 1,568 (5,551)
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of ($71), ($142), ($142) and ($285), respectively 253 509 506 1,018
Change in cumulative foreign currency translation adjustment (29) (176) 66 (410)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) (835) (1,283) 2,140 (4,943)
COMPREHENSIVE INCOME $ 48,843 $ 40,219 $ 91,657 $ 86,529