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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, 2019 | Dec. 31, 2018
--- | --- | ---
Pension Plans [Member] |  |
Net loss | $ 116,780 | $ 128,849
Prior service cost (credit) | 248 | 404
Net amount recognized | 117,028 | 129,253
OPEB [Member] |  |
Net loss | 12,437 | 7,269
Prior service cost (credit) | (2,106) | (8,651)
Net amount recognized | $ 10,331 | $ (1,382)

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