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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Prior service credit (cost) arising during the period, income tax expense (benefit) $ (16) $ (257) $ (91)
Amortization of prior service cost (credit) included in net periodic benefit cost (income), income tax expense (benefit) (680) (681) (720)
Actuarial net gain (loss) arising during the period, income tax expense (benefit) (5,852) 5,952 (6,976)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), income tax expense (benefit) 1,460 901 1,381
Foreign currency translation adjustments, income tax expense (benefit) $ (636) $ (181) $ (535)