Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 38,149	$ 55,794
Other comprehensive income:
Changes in currency translation adjustment and other	15,742	13,684
Amortization of pension and postretirement items	8,109	7,423
Income tax expense related to amortization of pension and postretirement items	(3,045)	(2,708)
Amortization of pension and postretirement items, net of tax	5,064	4,715
Other comprehensive income, net of taxes	20,806	18,399
Comprehensive income	$ 58,955	$ 74,193