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Pension and Severance Plans (Schedule of Components of Net Periodic Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]      
Service cost $ 13,645 $ 15,032 $ 20,072
Interest cost 5,718 6,202 4,731
Expected return on plan assets (5,554) (5,144) (5,605)
Recognized actuarial (gain) loss (462) (156) 53
Net periodic pension cost 13,347 15,934 19,251
Curtailment (gain) loss (320) (617) 0
Settlement (gain) loss 33 132 (1,374)
Total pension expense $ 13,060 $ 15,449 $ 17,877