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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net earnings $ 273,298 $ 791,832 $ 263,069
Changes in cumulative translation adjustment and other (58,960) 66,172 (70,590)
Other comprehensive (loss) income:      
Amortization of pension and postretirement items 27,499 31,520 29,493
Income tax expense related to amortization of pension and postretirement items (6,422) (11,034) (10,452)
Amortization of pension and postretirement items, net of tax 21,077 20,486 19,041
Change in net actuarial loss and prior service cost (83,695) 49,680 (98,092)
Income tax benefit (expense) related to change in net actuarial loss and prior service cost 18,327 (9,807) 28,344
Change in net actuarial loss and prior service cost, net of taxes (65,368) 39,873 (69,748)
Other comprehensive (loss) income, net of taxes (103,251) 126,531 (121,297)
Comprehensive income $ 170,047 $ 918,363 $ 141,772