Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Service Cost	$ 869	$ 810
Defined Benefit Plan, Interest Cost	2,749	2,814
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(9,772)	(9,809)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(44)	(44)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	(6,198)	(6,230)
Other Postretirement Benefits Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Interest Cost	22	26
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(19)	(19)
Defined Benefit Plan, Amortization of Gain (Loss)	0	4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 3	$ 12