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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Postretirement Medical Benefits |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Interest cost | $ 678 | $ 761 | $ 464
Amortization of unrecognized net (gain) loss | 69 | 53 | 192
U.S. net pension expense | 869 | 936 | 778
United States | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 23,935 | 21,341 | 24,680
Interest cost | 20,759 | 20,480 | 13,157
Expected return on plan assets | (23,235) | (23,931) | (25,345)
Settlement (gain) loss and other | 0 | 15 | 0
Amortization of unrecognized prior service cost | 194 | 185 | 175
Amortization of unrecognized net (gain) loss | 0 | (13) | 3,461
U.S. net pension expense | 21,653 | 18,077 | 16,128
Foreign Plan | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 6,381 | 4,611 | 5,984
Interest cost | 12,401 | 11,897 | 6,506
Expected return on plan assets | (7,740) | (6,659) | (5,883)
Settlement (gain) loss and other | (63) | (23) | (75)
Amortization of unrecognized net (gain) loss | 2,561 | 1,270 | 2,729
U.S. net pension expense | $ 13,836 | $ 11,396 | $ 9,554

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