Schedule I - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Comprehensive Income (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax expense (benefit) on actuarial gain (loss), employee benefit plans	$ (7,606)	$ (5,978)	$ 13,263
Tax benefit on prior service credit	2,567
Tax expense, adjustment for items reclassified to earnings, employee benefit plans	1,521	994	1,609
Parent Company
Tax expense (benefit) on actuarial gain (loss), employee benefit plans	(7,606)	(5,978)	13,263
Tax benefit on prior service credit	2,567
Tax expense, adjustment for items reclassified to earnings, employee benefit plans	$ 1,521	$ 994	$ 1,609