Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments	$ (5,838)	$ (3,058)	$ (11,149)	$ (9,475)
Income tax expense (benefit)	7,278	194	14,586	(47,918)
Net of tax	(812)	37,534	(16,572)	86,730
Defined benefit pension plan adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments	438	411	875	826
Income tax expense (benefit)	(117)	(115)	(233)	(229)
Net of tax	321	296	642	597
Unrealized loss in fair value of investment adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments	(38)	55	19	85
Income tax expense (benefit)	8	(12)	(4)	(18)
Net of tax	$ (30)	$ 43	$ 15	$ 67