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Pensions and Other Postretirement Benefits (Unrecognized Actuarial Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized net actuarial loss | $ 6,500 | $ 5,237
Unrecognized prior service cost | 62 | 9
Unamortized transition obligation | 1 | 2
Benefit plans, accumulated other comprehensive income (loss) before tax | 6,563 | 5,248
OPEB Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized net actuarial loss | 1,808 | 2,095
Unrecognized prior service cost |  | 0
Unamortized transition obligation |  | 0
Benefit plans, accumulated other comprehensive income (loss) before tax | $ 1,808 | $ 2,095

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