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Pension and Severance Plans (Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Plans with underfunded or non-funded projected benefit obligation: |  |
Aggregate projected benefit obligation | $ 100,662 | $ 96,310
Aggregate fair value of plan assets | 53,539 | 51,581
Plans with underfunded or non-funded accumulated benefit obligation: |  |
Aggregate accumulated benefit obligation | 60,638 | 61,764
Aggregate fair value of plan assets | $ 21,304 | $ 20,740

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