Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 163,880	$ 131,106
Other comprehensive income (loss), net of tax:
Net loss arising during the period, net of tax benefit of $1,570 and $0	(4,587)	0
Effect of pension settlement, net of tax expense of $3,612 and $0	10,553	0
Amortization of actuarial loss included in net income, net of tax expense of $475 and $1,109	1,384	3,157
Amortization of prior service cost (credit) included in net income, net of tax expense (benefit) of $44 and $(73)	130	(204)
Cash flow hedges, net of tax expense of $2,249 and $4,031	43,276	64,107
Other comprehensive income, net of tax	50,756	67,060
Comprehensive income	$ 214,636	$ 198,166