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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net earnings (loss) $ 519,041 $ (122,250) $ (24,410)
Other comprehensive income (loss):      
Changes in cumulative translation adjustment and unrealized loss from cash flow hedges 1,606 6,867 30,681
Amortization of pension and postretirement items 27,741 40,362 30,305
Income tax expense related to amortization of pension and postretirement items (5,781) (9,090) (7,059)
Amortization of pension and postretirement items, net of tax 21,960 31,272 23,246
Reclassification of net actuarial loss due to pension settlement 0 0 34,974
Change in net actuarial loss and prior service cost 122,707 (16,894) (7,609)
Income tax (expense) benefit related to change in net actuarial loss and prior service cost (18,309) (1,959) (6,149)
Change in net actuarial loss and prior service cost, net of taxes 104,398 (18,853) 21,216
Other comprehensive income, net of taxes 127,964 19,286 75,143
Comprehensive income (loss) $ 647,005 $ (102,964) $ 50,733