Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 21,876	$ 62,101	$ 333,900
Other comprehensive income (loss), net of tax:
Pension and other postretirement employee benefits	(9,726)	9,569	22,875
Cash flow hedges	20,835	(4,189)	118,015
Other comprehensive income, net of tax	11,109	5,380	140,890
Comprehensive income	$ 32,985	$ 67,481	$ 474,790