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Pension and Severance Plans (Schedule of Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 3,995,035 $ 3,699,701 $ 2,972,546
Amortization and settlement gain included in net periodic pension cost (641) (526)  
Net gain (loss) arising during period (8,199) 177  
Total other comprehensive income (loss) (8,840) (349) (3,279)
Balance at end of period 4,183,165 3,995,035 3,699,701
Prior Service Cost      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period 602 602  
Amortization and settlement gain included in net periodic pension cost 0 0  
Net gain (loss) arising during period 0 0  
Total other comprehensive income (loss) 0 0  
Balance at end of period 602 602 602
Actuarial Net Gain (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period 15,303 13,618  
Amortization and settlement gain included in net periodic pension cost (388) (46)  
Net gain (loss) arising during period 1,053 1,731  
Total other comprehensive income (loss) 665 1,685  
Balance at end of period 15,968 15,303 13,618
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period 15,905 14,220  
Amortization and settlement gain included in net periodic pension cost (388) (46)  
Net gain (loss) arising during period 1,053 1,731  
Total other comprehensive income (loss) 665 1,685  
Balance at end of period $ 16,570 $ 15,905 $ 14,220