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Retirement and Pension Plans - Components of Net Periodic Pension Benefit Expense (Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined benefit plans:        
Service cost $ 603 $ 737 $ 1,771 $ 2,194
Interest cost 7,356 7,043 21,856 21,010
Expected return on plan assets (13,259) (13,702) (39,589) (40,953)
Amortization of net actuarial loss and other 2,074 2,358 6,159 7,028
Pension income (3,226) (3,564) (9,803) (10,721)
Other plans:        
Defined contribution plans 10,383 9,759 34,074 35,339
Foreign plans and other 1,569 2,275 4,557 6,251
Total other plans 11,952 12,034 38,631 41,590
Total net pension expense $ 8,726 $ 8,470 $ 28,828 $ 30,869