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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 166,830 $ 55,661 $ 122,880
Other comprehensive (loss) income, net of tax:      
Net loss arising during the period, net of tax benefit of $3,531, $1,348 and $5,521 (10,053) (3,836) (15,714)
Effect of pension settlement, net of tax benefit of $11,177 31,811    
Amortization of actuarial loss included in net income, net of tax expense of $4,445, $3,772 and $4,654 12,653 10,737 13,246
Amortization of prior service credit included in net income, net of tax benefit of $(303), $(2,244) and $(2,259) (860) (6,389) (6,432)
Cash flow hedges, net of tax expense (benefit) of $396, $(978) and $(119) (7,181) (18,440) (2,415)
Other comprehensive income (loss), net of tax 26,370 (17,928) (11,315)
Comprehensive income $ 193,200 $ 37,733 $ 111,565