v3.26.3
Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Plan [Member]        
Net period benefit cost for the pension and postretirement plans        
Defined Benefit Plan, Service Cost $ 869 $ 636 $ 2,606 $ 2,255
Defined Benefit Plan, Interest Cost 2,749 3,027 8,248 8,655
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (9,772) (9,832) (29,316) (29,450)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (44) (44) (133) (133)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (6,198) (6,213) (18,595) (18,673)
Other Postretirement Benefits Plan [Member]        
Net period benefit cost for the pension and postretirement plans        
Defined Benefit Plan, Interest Cost 22 26 65 78
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (19) (19) (56) (56)
Defined Benefit Plan, Amortization of Gain (Loss) 0 4 0 12
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ 3 $ 11 $ 9 $ 34