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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 1,525 | $ 1,600
Interest cost | 6,593 | 6,275
Expected return on plan assets | (12,075) | (11,268)
Amortization of net (gain) or loss and prior service costs | 202 | 1,140
Net periodic benefit cost | (3,755) | (2,253)
Other Post-Retirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 9 | 9
Interest cost | 154 | 154
Amortization of net (gain) or loss and prior service costs | (185) | (185)
Net periodic benefit cost | $ (22) | $ (22)

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