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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, 2022 | Dec. 31, 2021
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Pension Plans [Member] |  |
Net (loss) income | $ (33,043) | $ (49,476)
Prior service (cost) credit | (49) | (103)
Total amount unrecognized | (33,092) | (49,579)
OPEB [Member] |  |
Net (loss) income | 4,598 | (2,075)
Prior service (cost) credit | 0 | 285
Total amount unrecognized | $ 4,598 | $ (1,790)

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