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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Fair Value of Plan Assets | $ 329,796 | $ 325,790 | $ 398,468
Cash and Cash Equivalents [Member] |  |  |
Fair Value of Plan Assets | 4,269 | 5,571 |
Global Equities [Member] |  |  |
Fair Value of Plan Assets | 66,517 | 104,775 |
Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | 241,911 | 172,909 |
Alternative Securities [Member] |  |  |
Fair Value of Plan Assets | 17,099 | 42,535 |
Level 1 |  |  |
Fair Value of Plan Assets | 270,391 | 296,296 |
Level 1 | Cash and Cash Equivalents [Member] |  |  |
Fair Value of Plan Assets | 4,269 | 5,571 |
Level 1 | Global Equities [Member] |  |  |
Fair Value of Plan Assets | 66,517 | 104,775 |
Level 1 | Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | 182,506 | 143,415 |
Level 1 | Alternative Securities [Member] |  |  |
Fair Value of Plan Assets | 17,099 | 42,535 |
Level 2 [Member] |  |  |
Fair Value of Plan Assets | 59,405 | 29,494 |
Level 2 [Member] | Fixed Income Securities [Member] |  |  |
Fair Value of Plan Assets | $ 59,405 | $ 29,494 |

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