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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Postretirement Medical Benefits |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Interest cost | $ 464 | $ 399 | $ 596
Amortization of unrecognized net loss | 192 | (21) | (132)
U.S. net pension expense | 778 | 500 | 586
United States | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 24,680 | 25,162 | 25,893
Interest cost | 13,157 | 11,952 | 15,100
Expected return on plan assets | (25,345) | (25,377) | (25,794)
Settlement loss and other | 0 | 0 | 128
Amortization of unrecognized prior service cost | 175 | 188 | 184
Amortization of unrecognized net loss | 3,461 | 7,725 | 6,977
U.S. net pension expense | 16,128 | 19,650 | 22,488
Foreign Plan | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 5,984 | 7,336 | 7,052
Interest cost | 6,506 | 5,544 | 6,572
Expected return on plan assets | (5,883) | (6,204) | (5,018)
Settlement loss and other | (75) | 640 | 708
Amortization of unrecognized net loss | 2,729 | 4,509 | 4,315
U.S. net pension expense | $ 9,554 | $ 12,125 | $ 13,891

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