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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost (benefit) | $ 1,551 | $ 1,927 | $ 3,151 | $ 3,906
Interest cost | 6,273 | 6,010 | 12,548 | 11,930
Expected return on plan assets | (11,266) | (11,906) | (22,534) | (23,823)
Amortization of net (gain) or loss and prior service costs | 1,118 | 1,420 | 2,258 | 2,624
Net periodic benefit cost | (2,324) | (2,549) | (4,577) | (5,363)
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost (benefit) | 9 | 9 | 18 | 18
Interest cost | 154 | 154 | 308 | 308
Amortization of net (gain) or loss and prior service costs | (185) | (185) | (370) | (370)
Net periodic benefit cost | $ (22) | $ (22) | $ (44) | $ (44)

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