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Pension and Severance Plans (Schedule of Changes in Projected Benefit Obligations and Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in projected benefit obligation:      
Projected benefit obligation at January 1 $ 164,281 $ 159,760  
Service cost 13,645 15,032 $ 20,072
Interest cost 5,718 6,202 4,731
Benefits paid (11,320) (14,056)  
Actuarial (gain) loss 2,458 4,150  
Effects of curtailment (320) (617)  
Settlement (883) (1,073)  
Foreign exchange (gain) loss (14,423) (5,117)  
Projected benefit obligation at December 31 159,156 164,281 159,760
Change in plan assets:      
Fair value of plan assets at January 1 129,196 127,338  
Actual gain (loss) on plan assets 8,918 12,325  
Employer contributions 12,165 7,368  
Settlement (883) (1,073)  
Benefits paid (11,320) (14,056)  
Foreign exchange gain (loss) (12,794) (2,706)  
Fair value of plan assets at December 31 125,282 129,196 $ 127,338
Funded status of the Plans at December 31 $ (33,874) $ (35,085)