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Pension and Other Postretirement Employee Benefits (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Funding of pension and other postretirement benefit plans | $ 8,664 | $ 7,303
Non-Qualified Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funding of pension and other postretirement benefit plans | 3,000 | 3,300
Qualified Plan [Member] | Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions to pension benefit plan | $ 5,700 | $ 4,000

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