Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 45,955	$ 65,667	$ 330,057	$ 384,678
Other comprehensive income (loss):
Net loss arising during the period, net of tax benefit of $0, $0, $1,570 and $0	0	0	(4,587)	0
Effect of pension settlement, net of tax expense of $0, $0, $3,612 and $0	0	0	10,553	0
Amortization of actuarial loss included in net income, net of tax expense of $270, $1,073, $1,012 and $3,254	784	3,050	2,954	9,258
Amortization of prior service cost (credit) included in net income, net of tax expense (benefit) of $44, $(73), $133 and $(217)	130	(204)	389	(614)
Cash flow hedges, net of tax (benefit) expense of $(4,093), $397, $973 and $2,249	32,725	6,636	118,530	39,580
Other comprehensive income, net of tax	33,639	9,482	127,839	48,224
Comprehensive income	$ 79,594	$ 75,149	$ 457,896	$ 432,902