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Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net earnings $ 33,505 $ 38,406
Other comprehensive income:    
Changes in currency translation adjustment and other 11,892 15,742
Amortization of pension and postretirement items 7,215 8,109
Income tax expense related to amortization of pension and postretirement items (1,609) (3,045)
Amortization of pension and postretirement items, net of tax 5,606 5,064
Other comprehensive income, net of taxes 17,498 20,806
Comprehensive income $ 51,003 $ 59,212