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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)