Retirement Plans, Other Changes in Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ (325)	$ (148)	$ (148)
Amortization of actuarial loss	(51,745)	25,519	7,780
Income tax benefit (expense)	13,495	(7,803)	(3,064)
Other comprehensive income (loss) on pension and postretirement obligations	(37,917)	23,656	$ 8,465
RAP
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	(53,466)	25,257
Amortization of prior service cost	(250)	(73)
Amortization of actuarial loss	658	4,594
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	1,494
Income tax benefit (expense)	13,553	(7,791)
Other comprehensive income (loss) on pension and postretirement obligations	(39,504)	23,480
Postretirement Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	305	119
Amortization of prior service cost	(75)	(75)
Amortization of actuarial loss	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0
Income tax benefit (expense)	(58)	(11)
Other comprehensive income (loss) on pension and postretirement obligations	$ 171	$ 33