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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]      
NET INCOME $ 138,304 $ 58,840 $ 103,885
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:      
Unrealized gain (loss) on available-for-sale securities, net of tax of $51, $74 and $7, respectively 181 268 (12)
Employee benefit plan:      
Actuarial loss on retirement plan, net of tax of $988, $1,841 and $1,047, respectively (3,492) (6,690) (1,904)
Plan amendment cost, net of tax of none, none and $154, respectively     (280)
Amortization of prior service cost, actuarial loss and plan amendment cost for retirement plan included in net periodic pension costs, net of tax of $713, $457 and $754, respectively 2,523 1,661 1,370
Net change in employee benefit plan (969) (5,029) (814)
Change in cumulative foreign currency translation adjustment 25 (9) 28
TOTAL OTHER COMPREHENSIVE LOSS (763) (4,770) (798)
COMPREHENSIVE INCOME $ 137,541 $ 54,070 $ 103,087