Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized loss in fair value of investment adjustments	$ (5,311)	$ (6,417)
Income tax benefit	7,308	(48,112)
Net of tax	(15,760)	49,196
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	437	415
Income tax benefit	(116)	(114)
Net of tax	321	301
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	57	30
Income tax benefit	(12)	(6)
Net of tax	$ 45	$ 24