Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Retirement Benefits [Abstract]
Service cost—benefits earned during the period	$ 6,228	$ 5,390	$ 12,449	$ 10,782
Interest cost on projected benefit obligation	8,308	7,834	16,575	15,668
Expected return on assets	(10,647)	(9,656)	(21,293)	(19,312)
Prior service cost	269	269	538	538
Actuarial (gain) loss	6	(52)	12	(104)
Net periodic benefit cost	$ 4,164	$ 3,785	$ 8,281	$ 7,572