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Pension and Postretirement Benefits (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Postretirement Medical Benefits |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] |  |  |
Balance — January 1 | $ (2,072) | $ (1,213) |
Amortization of net loss | 147 | (16) |
Net gain (loss) arising during the year | 1,336 | (937) |
Amortization of prior service cost | (93) | (94) |
Prior service cost arising during the year | 122 | 122 | $ 122
Balance — December 31 | (496) | (2,072) | (1,213)
United States | Pension Plan |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] |  |  |
Balance — January 1 | (30,014) | (49,321) |
Amortization of net loss | 2,647 | 5,907 |
Net gain (loss) arising during the year | (17,085) | 13,256 |
Amortization of prior service cost | (134) | (144) |
Prior service cost arising during the year | 137 | 0 |
Balance — December 31 | (44,455) | (30,014) | (49,321)
Foreign Plan | Pension Plan |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] |  |  |
Balance — January 1 | (70,581) | (97,246) |
Amortization of net loss | 2,450 | 4,207 |
Net gain (loss) arising during the year | 21,099 | 17,995 |
Settlement losses | (130) | (616) |
Currency translation impact and other | 4,714 | 3,847 |
Prior service cost arising during the year | 293 | 300 | 262
Prior service cost arising during the year | 233 | 0 |
Balance — December 31 | $ (42,421) | $ (70,581) | $ (97,246)

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