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Pension and Postretirement Benefits (Change in Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Postretirement Medical Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 $ 13,353 $ 17,021  
Interest cost 761 464 $ 399
Employee contributions 379 792  
Medicare subsidies receivable 60 0  
Actuarial loss (gain) (49) (1,747)  
Benefits paid (2,087) (3,177)  
Balance — December 31 12,417 13,353 17,021
United States | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 382,959 471,825  
Service cost 21,341 24,680 25,162
Interest cost 20,480 13,157 11,952
Plan amendments and settlements (3,103) 179  
Actuarial loss (gain) 31,912 (87,791)  
Benefits paid (35,941) (39,091)  
Balance — December 31 417,648 382,959 471,825
Accumulated benefit obligations 417,648 382,488  
Foreign Plan | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 268,364 420,809  
Service cost 4,611 5,984 7,336
Interest cost 11,897 6,506 5,544
Employee contributions 80 71  
Settlements and other 982 7,944  
Actuarial loss (gain) 17,082 (108,546)  
Benefits paid (15,181) (15,797)  
Currency translation impact 11,729 (32,719)  
Balance — December 31 297,600 268,364 $ 420,809
Accumulated benefit obligations $ 279,760 $ 253,428