Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 23,675	$ 45,955	$ 62,241	$ 330,057
Other comprehensive income (loss), net of tax:
Pension and other postretirement employee benefits	(132)	914	(607)	9,309
Cash flow hedges	28,464	32,725	28,848	118,530
Other comprehensive income, net of tax	28,332	33,639	28,241	127,839
Comprehensive income	$ 52,007	$ 79,594	$ 90,482	$ 457,896