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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Amounts Recorded in AOCI on Consolidated Balance Sheets, Not Recognized as Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Pension Plans [Member] |  |
Net (loss) income | $ (27,307) | $ (33,043)
Prior service cost | (15) | (49)
Total amount unrecognized | (27,322) | (33,092)
OPEB [Member] |  |
Net (loss) income | 8,397 | 4,598
Prior service cost | 0 | 0
Total amount unrecognized | $ 8,397 | $ 4,598

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