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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
NET INCOME $ 40,500 $ 36,962 $ 79,470 $ 111,876
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:        
Unrealized (loss) gain on available-for-sale securities, net of tax of $177, $7, $97 and $49, respectively (626) 27 342 178
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $181, $175, $543 and $525, respectively 639 634 1,917 1,903
Change in cumulative foreign currency translation adjustment 1 25 (29) 34
TOTAL OTHER COMPREHENSIVE INCOME 14 686 2,230 2,115
COMPREHENSIVE INCOME $ 40,514 $ 37,648 $ 81,700 $ 113,991