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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net earnings (loss) $ (24,410) $ 284,613 $ 719,644
Other comprehensive income (loss):      
Changes in cumulative translation adjustment and other 30,681 (55,940) 62,837
Amortization of pension and postretirement items 30,305 27,499 31,520
Income tax expense related to amortization of pension and postretirement items (7,059) (6,422) (11,034)
Amortization of pension and postretirement items, net of tax 23,246 21,077 20,486
Reclassification of net actuarial loss due to pension settlement 34,974 0 0
Change in net actuarial loss and prior service cost (7,609) (83,695) 49,680
Income tax benefit (expense) related to pension settlement and change in net actuarial loss and prior service cost (6,149) 18,327 (9,807)
Change in net actuarial loss and prior service cost, net of taxes 21,216 (65,368) 39,873
Other comprehensive income (loss), net of taxes 75,143 (100,231) 123,196
Comprehensive income $ 50,733 $ 184,382 $ 842,840