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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]      
Net income $ 707,755 $ 692,843 $ 521,571
Other comprehensive (loss) income:      
Foreign currency translation (46,135) (1,903) 5,984
Unrealized gains (losses) on investments before income taxes 26 (26) 0
Income tax (expense) benefit (6) 6 0
Unrealized gains (losses) on investments, net of tax 20 (20) 0
Retirement liability adjustment before reclassifications 20,953 9,342 (6,786)
Amounts reclassified to other income (expense), net 574 1,167 1,389
Retirement liability adjustment before income taxes 21,527 10,509 (5,397)
Income tax (expense) benefit (5,119) (2,508) 941
Retirement liability adjustment, net of tax 16,408 8,001 (4,456)
Other comprehensive (loss) income (29,707) 6,078 1,528
Comprehensive income $ 678,048 $ 698,921 $ 523,099