Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Service cost—benefits earned during the period	$ 6,245	$ 6,224	$ 18,730	$ 18,673
Interest cost on projected benefit obligation	9,024	8,287	27,073	24,862
Expected return on assets	(11,563)	(10,645)	(34,689)	(31,938)
Prior service cost	292	265	876	803
Actuarial (gain) loss	0	6	0	18
Net periodic benefit cost	$ 3,998	$ 4,137	$ 11,990	$ 12,418