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Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 270,568 $ 254,286 $ 234,734
Pension plans and other postretirement benefits:      
Prior service credit (cost) arising during the period, net of income tax expense (benefit) of $(16) in 2020, $(257) in 2019 and $(91) in 2018 (49) (756) (446)
Amortization of prior service cost (credit) included in net periodic benefit cost (income), net of income tax expense (benefit) of $(680) in 2020, $(681) in 2019 and $(720) in 2018 (2,120) (2,211) (2,363)
Actuarial net gain (loss) arising during the period, net of income tax expense (benefit) of $(5,852) in 2020, $5,952 in 2019 and $(6,976) in 2018 (25,441) 16,739 (24,581)
Amortization of actuarial net loss (gain) included in net periodic benefit cost (income), net of income tax expense (benefit) of $1,460 in 2020, $901 in 2019 and $1,381 in 2018 4,634 2,988 4,355
Total pension plans and other postretirement benefits (22,976) 16,760 (23,035)
Foreign currency translation adjustments, net of income tax expense (benefit) of $(636) in 2020, $(181) in 2019 and $(535) in 2018 12,560 1,808 (12,287)
Other comprehensive income (loss) (10,416) 18,568 (35,322)
Comprehensive income $ 260,152 $ 272,854 $ 199,412