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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 Income And Comprehensive Income [Abstract]      
Net income $ 725,983 $ 601,822 $ 563,648
Other comprehensive income (loss):      
Foreign currency translation adjustments (3,624) 4,771 2,037
Income tax effect 943 (62) (776)
Foreign currency translation adjustments, net (2,681) 4,709 1,261
Pension and other post-retirement adjustments 3,546 (1,675) (6,477)
Income tax effect (801) 686 1,036
Pension and other post-retirement adjustments, net 2,745 (989) (5,441)
Other comprehensive income (loss), net of tax 64 3,720 (4,180)
Comprehensive income $ 726,047 $ 605,542 $ 559,468