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Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Plan [Member]        
Net period benefit cost for the pension and postretirement plans        
Defined Benefit Plan, Service Cost $ 810 $ 881 $ 1,619 $ 1,755
Defined Benefit Plan, Interest Cost 2,814 2,719 5,628 5,438
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (9,809) (8,650) (19,619) (17,301)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (44) (54) (89) (107)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (6,230) (5,104) (12,460) (10,215)
Other Postretirement Benefits Plan [Member]        
Net period benefit cost for the pension and postretirement plans        
Defined Benefit Plan, Interest Cost 26 18 53 37
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (19) (19) (38) (38)
Defined Benefit Plan, Amortization of Gain (Loss) 4 (7) 8 (14)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 12 $ (8) $ 23 $ (15)