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Pension and Severance Plans (Defined Benefit Plans - Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Prepaid benefit cost (included in non-current assets)	$ 12,039	$ 12,308
Accrued benefit liability (included in pension and severance obligations)	(47,124)	(44,730)
Net amount recognized at year end	$ (35,085)	$ (32,422)

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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