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Pension Plans and Other Postretirement Benefits (Pension Plans With The Benefit Obligation In Excess Of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits | United States    
Defined benefit plans with accumulated benefit obligation in excess of plan assets    
Accumulated benefit obligation $ 39,016 $ 38,167
Fair market value of plan assets 0 0
Pension plans with project benefit obligation in excess of the fair market value of plan assets    
Projected benefit obligation 41,081 41,201
Fair market value of plan assets 0 0
Pension Benefits | Foreign Retirement Plans    
Defined benefit plans with accumulated benefit obligation in excess of plan assets    
Accumulated benefit obligation 32,176 27,879
Fair market value of plan assets 14,527 12,642
Pension plans with project benefit obligation in excess of the fair market value of plan assets    
Projected benefit obligation 257,642 41,126
Fair market value of plan assets 207,131 12,642
Postretirement Benefits | United States    
Defined benefit plans with accumulated benefit obligation in excess of plan assets    
Accumulated benefit obligation 25,584 24,651
Fair market value of plan assets $ 0 $ 0