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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
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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

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