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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost (benefit) $ 1,455 $ 1,900 $ 4,606 $ 5,806
Interest cost 6,269 6,056 18,817 17,986
Expected return on plan assets (11,263) (11,901) (33,797) (35,724)
Amortization of net (gain) or loss and prior service costs 1,073 1,530 3,331 4,154
Net periodic benefit cost (2,466) (2,415) (7,043) (7,778)
Other Post-Retirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost (benefit) 5 7 23 25
Interest cost 115 135 423 443
Amortization of net (gain) or loss and prior service costs (338) (215) (708) (585)
Net periodic benefit cost $ (218) $ (73) $ (262) $ (117)