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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
NET INCOME $ 184,213 $ 133,372 $ 138,304
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX:      
Unrealized (loss) gain on available-for-sale securities, net of tax of $65, $28 and $51, respectively (233) (100) 181
Employee benefit plan:      
Actuarial gain (loss) on retirement plan, net of tax of $1,336, $3,569 and $988, respectively 13,620 (21,464) (3,492)
Plan amendment cost, net of tax of $79, none and none, respectively (283)    
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, net of tax of $1,316, $723 and $713, respectively 4,719 2,556 2,523
Net change in employee benefit plan 18,056 (18,908) (969)
Change in cumulative foreign currency translation adjustment (39) (14) 25
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) 17,784 (19,022) (763)
COMPREHENSIVE INCOME $ 201,997 $ 114,350 $ 137,541