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Retirement and Pension Plans - Components of Net Periodic Pension Benefit Expense (Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined benefit plans:        
Service cost $ 596 $ 727 $ 1,168 $ 1,457
Interest cost 7,325 6,978 14,500 13,967
Expected return on plan assets (13,236) (13,619) (26,330) (27,251)
Amortization of net actuarial loss and other 2,066 2,333 4,085 4,670
Pension income (3,249) (3,581) (6,577) (7,157)
Other plans:        
Defined contribution plans 11,187 10,985 23,691 25,580
Foreign plans and other 1,184 2,287 2,988 3,976
Total other plans 12,371 13,272 26,679 29,556
Total net pension expense $ 9,122 $ 9,691 $ 20,102 $ 22,399