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Pensions and Other Postretirement Benefits (Accrued Pension and Other Postretirement Costs) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Accrued pension and other postretirement costs | $ (14,982) | $ (16,424)
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued pension and other postretirement costs | (9,421) | (11,163)
OPEB Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued pension and other postretirement costs | $ (4,645) | $ (4,726)

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