Postretirement Benefits - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Retirement Benefits [Abstract]
Service cost	$ 5,390	$ 8,656	$ 10,782	$ 17,311
Interest cost	7,834	6,121	15,668	12,244
Expected return on assets	(9,656)	(8,885)	(19,312)	(17,770)
Prior service cost	269	158	538	316
Actuarial (gain) loss	(52)	3,208	(104)	6,417
Net periodic benefit cost	$ 3,785	$ 9,258	$ 7,572	$ 18,518