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Pension and Severance Plans (Changes and Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Benefits [Abstract]      
Service cost $ 15,032 $ 20,072 $ 25,908
Interest cost 6,202 4,731 4,900
Expected return on plan assets (5,144) (5,605) (5,600)
Recognized actuarial (gain) loss (156) 53 128
Net periodic pension cost 15,934 19,251 25,336
Curtailment (gain) loss (617) 0 (954)
Settlement (gain) loss 132 (1,374) (743)
Total pension expense $ 15,449 $ 17,877 $ 23,639