Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Retirement Benefits [Abstract]
Service cost—benefits earned during the period	$ 6,221	$ 5,392
Interest cost on projected benefit obligation	8,267	7,834
Expected return on assets	(10,646)	(9,656)
Prior service cost	269	269
Actuarial (gain) loss	6	(52)
Net periodic benefit cost	$ 4,117	$ 3,787