Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 333,900	$ 423,860	$ 166,830
Other comprehensive income (loss), net of tax:
Net gain (loss) arising during the period, net of tax expense (benefit) of $2,760, $11,444 and $(3,531)	8,065	31,525	(10,053)
Effect of pension settlement, net of tax expense of $3,612, $0 and $11,177	10,553	0	31,811
Amortization of actuarial loss included in net income, net of tax expense of $1,537, $4,901 and $4,445	4,486	11,732	12,653
Amortization of prior service credit included in net income, net of tax benefit of $(79), $(288) and $(303)	(229)	(818)	(860)
Cash flow hedges, net of tax expense of $987, $1,706 and $396	118,015	35,312	(7,181)
Other comprehensive income, net of tax	140,890	77,751	26,370
Comprehensive income	$ 474,790	$ 501,611	$ 193,200