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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Postretirement Medical Benefits |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Interest cost | $ 399 | $ 596 | $ 754
Amortization of unrecognized net loss | (21) | (132) | (215)
U.S. net pension expense | 500 | 586 | 661
United States | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 25,162 | 25,893 | 23,245
Interest cost | 11,952 | 15,100 | 17,584
Expected return on plan assets | (25,377) | (25,794) | (25,645)
Settlement loss and other | 0 | 128 | 0
Amortization of unrecognized prior service cost | 188 | 184 | 164
Amortization of unrecognized net loss | 7,725 | 6,977 | 3,675
U.S. net pension expense | 19,650 | 22,488 | 19,023
Foreign Plan | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 7,336 | 7,052 | 5,728
Interest cost | 5,544 | 6,572 | 8,867
Expected return on plan assets | (6,204) | (5,018) | (7,535)
Settlement loss and other | 640 | 708 | 859
Amortization of unrecognized net loss | 4,509 | 4,315 | 2,933
U.S. net pension expense | $ 12,125 | $ 13,891 | $ 11,117

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