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Pension and Postretirement Benefits (Change in Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Medical Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 $ 18,862 $ 18,810  
Interest cost 596 754 $ 779
Actuarial loss (gain) 2,434 2,222  
Benefits paid (4,167) (3,902)  
Employee contributions 916 964  
Medicare subsidies receivable 7 14  
Balance — December 31 18,648 18,862 18,810
United States | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 471,462 432,595  
Service cost 25,893 23,245 22,195
Interest cost 15,100 17,584 15,789
Plan amendments and settlements (953) 276  
Actuarial loss (gain) 29,166 31,214  
Benefits paid (53,250) (33,452)  
Balance — December 31 487,418 471,462 432,595
Accumulated benefit obligations 486,501 470,643  
Foreign Plan | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance — January 1 425,617 376,649  
Service cost 7,052 5,728 7,208
Interest cost 6,572 8,867 8,970
Actuarial loss (gain) 23,781 48,888  
Benefits paid (15,700) (14,526)  
Employee contributions 80 78  
Settlements and other (2,701) (3,713)  
Currency translation impact 25,297 3,646  
Balance — December 31 469,998 425,617 $ 376,649
Accumulated benefit obligations $ 446,097 $ 404,035