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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost (benefit) | $ 1,455 | $ 1,900 | $ 4,606 | $ 5,806
Interest cost | 6,269 | 6,056 | 18,817 | 17,986
Expected return on plan assets | (11,263) | (11,901) | (33,797) | (35,724)
Amortization of net (gain) or loss and prior service costs | 1,073 | 1,530 | 3,331 | 4,154
Net periodic benefit cost | (2,466) | (2,415) | (7,043) | (7,778)
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost (benefit) | 5 | 7 | 23 | 25
Interest cost | 115 | 135 | 423 | 443
Amortization of net (gain) or loss and prior service costs | (338) | (215) | (708) | (585)
Net periodic benefit cost | $ (218) | $ (73) | $ (262) | $ (117)

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