Employee Benefits - Summary of Components of Net Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of net periodic benefit cost:
Service cost	$ 6,339	$ 8,094	$ 19,016	$ 24,278
Interest cost	4,297	2,429	12,893	7,289
Expected return on plan assets	(7,532)	(9,280)	(22,596)	(27,842)
Prior service credit	(2,970)	(2,971)	(8,910)	(8,911)
Recognized net actuarial loss	2,468	2,799	7,404	8,395
Net periodic benefit cost	2,602	1,071	7,807	3,209
Discontinued Operations, Held-for-Sale | Insurance Agency Business
Components of net periodic benefit cost:
Service cost	$ 1,500	$ 1,900	$ 4,500	$ 5,800