Other Comprehensive Income (Loss) (AOCI Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized (gain) loss in fair value of investment adjustments	$ (6,417)	$ (3,697)
Income tax expense (benefit)	(48,112)	(3,889)
Net of tax	49,196	21,634
Defined Benefit Pension Plan | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined benefit pension plan adjustments/Unrealized (gain) loss in fair value of investment adjustments	415	639
Income tax expense (benefit)	(114)	(181)
Net of tax	301	458
Unrealized (gain) 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 (gain) loss in fair value of investment adjustments	30	11
Income tax expense (benefit)	(6)	(2)
Net of tax	$ 24	$ 9