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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Postretirement Medical Benefits |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Interest cost | $ 761 | $ 464 | $ 399
Amortization of unrecognized net (gain) loss | 53 | 192 | (21)
U.S. net pension expense | 936 | 778 | 500
United States | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 21,341 | 24,680 | 25,162
Interest cost | 20,480 | 13,157 | 11,952
Expected return on plan assets | (23,931) | (25,345) | (25,377)
Settlement (gain) loss and other | 15 | 0 | 0
Amortization of unrecognized prior service cost | 185 | 175 | 188
Amortization of unrecognized net (gain) loss | (13) | 3,461 | 7,725
U.S. net pension expense | 18,077 | 16,128 | 19,650
Foreign Plan | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 4,611 | 5,984 | 7,336
Interest cost | 11,897 | 6,506 | 5,544
Expected return on plan assets | (6,659) | (5,883) | (6,204)
Settlement (gain) loss and other | (23) | (75) | 640
Amortization of unrecognized net (gain) loss | 1,270 | 2,729 | 4,509
U.S. net pension expense | $ 11,396 | $ 9,554 | $ 12,125

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