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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1,979 | $ 2,929 | $ 3,959 | $ 5,729
Interest cost | 5,963 | 3,708 | 11,751 | 7,125
Expected return on plan assets | (11,178) | (11,711) | (22,356) | (23,186)
Amortization of net (gain) or loss and prior service costs | 1,911 | 582 | 3,681 | 1,930
Net periodic benefit cost | (1,325) | (4,492) | (2,965) | (8,402)
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 10 | 25 | (21) | 50
Interest cost | 149 | 76 | 365 | 153
Amortization of net (gain) or loss and prior service costs | (158) | (139) | (409) | (278)
Net periodic benefit cost | $ 1 | $ (38) | $ (65) | $ (75)

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