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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,525 $ 1,600
Interest cost 6,593 6,275
Expected return on plan assets (12,075) (11,268)
Amortization of net (gain) or loss and prior service costs 202 1,140
Net periodic benefit cost (3,755) (2,253)
Other Post-Retirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 9
Interest cost 154 154
Amortization of net (gain) or loss and prior service costs (185) (185)
Net periodic benefit cost $ (22) $ (22)