Summary of Significant Accounting Policies (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 17,200	$ 6,732	$ 2,004
Income tax expense (benefit)	54,957	75,098	(25,632)
Net of tax	(171,155)	(210,009)	91,925
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	1,700	2,570	2,861
Income tax expense (benefit)	(453)	(711)	(807)
Net of tax	1,247	1,859	2,054
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) in Fair Value of Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	115	121	(352)
Income tax expense (benefit)	(24)	(25)	74
Net of tax	$ 91	$ 96	$ (278)