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Retirement Plans and Postretirement Medical Benefits (Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
United States    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 1,729,638 $ 1,612,745
Accumulated benefit obligation 1,729,194 1,612,241
Fair value of plan assets 1,601,000 1,486,325
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 691,909 615,288
Accumulated benefit obligation 690,887 614,293
Fair value of plan assets $ 577,821 $ 516,634