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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ 2,638 $ 17,137 $ (14,194) $ 23,697
Other comprehensive income (loss), net of tax:        
Net loss arising during the period, net of tax benefit of $0, $0, $6,817 and $0     (19,402)  
Effect of pension settlement, net of tax benefit of $0, $0, $11,177 and $0     31,811  
Amortization of prior service credit included in net income (loss), net of tax benefit of $75, $561, $152 and $1,122 (215) (1,597) (430) (3,194)
Amortization of actuarial loss included in net income (loss), net of tax expense of $1,034, $915, $2,223 and $1,886 2,942 2,605 6,326 5,368
Cash flow hedges, net of tax expense (benefit) of $4, $(549), $(1,806) and $(913) (1,847) (10,417) (40,372) (18,930)
Other comprehensive income (loss), net of tax 880 (9,409) (22,067) (16,756)
Comprehensive income (loss) $ 3,518 $ 7,728 $ (36,261) $ 6,941