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Pensions and Other Postretirement Benefits (Projected and Accumulated Benefit Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation, all plans | $ 26,100 | $ 23,040
Plans for which the accumulated benefit obligation exceeds plan assets: |  |
Projected benefit obligation | 25,800 | 22,552
Accumulated benefit obligation | 25,158 | 22,155
Fair value of plan assets | $ 14,983 | $ 13,256

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