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Pension and Postretirement Benefits (Net Benefit Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Postretirement Medical Benefits |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Interest cost | $ 596 | $ 754 | $ 779
Amortization of unrecognized net loss | (132) | (215) | (764)
Amortization of unrecognized prior service cost (benefit) | 122 | 122 | 122
U.S. net pension expense | 586 | 661 | 137
United States | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 25,893 | 23,245 | 22,195
Interest cost | 15,100 | 17,584 | 15,789
Expected return on plan assets | (25,794) | (25,645) | (25,704)
Settlement loss (gain) and other | 128 | 0 | (462)
Amortization of unrecognized prior service cost | 184 | 164 | 164
Amortization of unrecognized net loss | 6,977 | 3,675 | 5,514
Amortization of unrecognized prior service cost (benefit) | 57 | 211 |
U.S. net pension expense | 22,488 | 19,023 | 17,496
Foreign Plan | Pension Plan |  |  |
Components of the net periodic cost for retirement and postretirement benefits |  |  |
Service cost | 7,052 | 5,728 | 7,208
Interest cost | 6,572 | 8,867 | 8,970
Expected return on plan assets | (5,018) | (7,535) | (8,747)
Settlement loss (gain) and other | 708 | 859 | (521)
Amortization of unrecognized net loss | 4,315 | 2,933 | 3,626
Amortization of unrecognized prior service cost (benefit) | 262 | 265 | 33
U.S. net pension expense | $ 13,891 | $ 11,117 | $ 10,569

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