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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Pension Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Service Cost	$ 869	$ 810	$ 1,737	$ 1,619
Defined Benefit Plan, Interest Cost	2,749	2,814	5,499	5,628
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(9,772)	(9,809)	(19,544)	(19,619)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(44)	(44)	(89)	(89)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	(6,198)	(6,230)	(12,397)	(12,460)
Other Postretirement Benefits Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Interest Cost	22	26	43	53
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(19)	(19)	(38)	(38)
Defined Benefit Plan, Amortization of Gain (Loss)	0	4	0	8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 3	$ 12	$ 6	$ 23