Pension Plans (Pension Plan Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	$ 3,363	$ 1,301	$ 5,234
Interest cost on projected benefit obligation	(17,198)	(14,165)	(21,020)
Expected return on plan assets	(42,177)	(45,177)	(43,183)
Recognized net loss	4,258	4,444	4,804
Additional amount recognized due to curtailment/settlement	0	0	0
Net pension benefit (income) cost	(17,358)	(25,267)	(12,125)
Change in net (loss) or gain	52,139	(8,113)	(708)
Amortization of net loss	(4,258)	(4,444)	(4,804)
Total recognized in other comprehensive (loss) income	47,881	(12,557)	(5,512)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	30,523	(37,824)	(17,637)
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	0	0	0
Interest cost on projected benefit obligation	(86)	(63)	(165)
Expected return on plan assets	0	0	0
Recognized net loss	61	65	944
Additional amount recognized due to curtailment/settlement	0	211	0
Net pension benefit (income) cost	147	339	1,109
Change in net (loss) or gain	(737)	(274)	703
Amortization of net loss	(61)	(65)	(944)
Total recognized in other comprehensive (loss) income	(798)	(339)	(241)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$ (651)	$ 0	$ 868