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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1,979 | $ 2,855 | $ 5,938 | $ 8,584
Interest cost | 6,052 | 3,756 | 17,803 | 10,881
Expected return on plan assets | (11,177) | (11,714) | (33,533) | (34,900)
Amortization of net (gain) or loss and prior service costs | 1,981 | 450 | 5,662 | 2,380
Net periodic benefit cost | (1,165) | (4,653) | (4,130) | (13,055)
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 25 | (13) | 75
Interest cost | 160 | 77 | 525 | 230
Amortization of net (gain) or loss and prior service costs | (243) | (139) | (652) | (417)
Net periodic benefit cost | $ (75) | $ (37) | $ (140) | $ (112)

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