Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Schedule of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortization of pension and other postretirement benefit plan items:
Total before tax	$ (227,942)	$ (285,756)	$ (317,393)
Tax expense	29,528	43,200	49,645
Total net of tax	(198,433)	$ (242,759)	$ (254,663)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Actuarial gains
Amortization of pension and other postretirement benefit plan items:
Other nonoperating expense (income)	(521)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Prior service cost
Amortization of pension and other postretirement benefit plan items:
Other nonoperating expense (income)	180
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Pension and Other Postretirement Benefit Plans
Amortization of pension and other postretirement benefit plan items:
Total before tax	(341)
Tax expense	81
Total net of tax	$ (260)