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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
NET INCOME $ 40,541 $ 815 $ 92,228 $ 38,970
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:        
Unrealized gain (loss) on available-for-sale securities, net of tax of $7, $251, $9 and $274, respectively 26 (887) (32) 968
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $334, $181, $669 and $362, respectively 1,174 640 2,348 1,278
Change in cumulative foreign currency translation adjustment 37 3 (69) (30)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 1,237 (244) 2,247 2,216
COMPREHENSIVE INCOME $ 41,778 $ 571 $ 94,475 $ 41,186