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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Service Cost	$ 636	$ 508	$ 2,255	$ 2,263
Defined Benefit Plan, Interest Cost	3,027	2,943	8,655	8,380
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(9,832)	(8,649)	(29,450)	(25,949)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(44)	(54)	(133)	(161)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	(6,213)	(5,252)	(18,673)	(15,467)
Other Postretirement Benefits Plan [Member]
Net period benefit cost for the pension and postretirement plans
Defined Benefit Plan, Interest Cost	26	18	78	54
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(19)	(19)	(56)	(56)
Defined Benefit Plan, Amortization of Gain (Loss)	4	(7)	12	(21)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 11	$ (8)	$ 34	$ (23)