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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Assets within Defined Benefit Pension Plans Invested) (Details) - Pension Plans [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair Value of Plan Assets | $ 177,875 | $ 172,246 | $ 329,796
Cash and Cash Equivalents [Member] |  |  |
Fair Value of Plan Assets | 3,009 | 3,690 |
Global Equities [Member] |  |  |
Fair Value of Plan Assets | 34,534 | 33,974 |
Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | 131,837 | 126,358 |
Alternative Securities [Member] |  |  |
Fair Value of Plan Assets | 8,495 | 8,224 |
Level 1 |  |  |
Fair Value of Plan Assets | 160,262 | 153,445 |
Level 1 | Cash and Cash Equivalents [Member] |  |  |
Fair Value of Plan Assets | 3,009 | 3,690 |
Level 1 | Global Equities [Member] |  |  |
Fair Value of Plan Assets | 34,534 | 33,974 |
Level 1 | Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | 114,224 | 107,557 |
Level 1 | Alternative Securities [Member] |  |  |
Fair Value of Plan Assets | 8,495 | 8,224 |
Level 2 [Member] |  |  |
Fair Value of Plan Assets | 17,613 | 18,801 |
Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 [Member] | Global Equities [Member] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | 17,613 | 18,801 |
Level 2 [Member] | Alternative Securities [Member] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |

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