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Pensions and Other Postretirement Benefit Plans (Schedule of Pension Plans with Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Plans with projected benefit obligation in excess of plan assets: |  |
Projected benefit obligation | $ 137,123 | $ 123,261
Fair value of plan assets | 100,330 | 86,547
Plans with accumulated benefit obligation in excess of plan assets: |  |
Accumulated benefit obligation | 134,737 | 120,869
Fair value of plan assets | $ 100,330 | $ 86,062

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