Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 50,816	$ 73,750	$ 88,965	$ 129,544
Other comprehensive income (loss):
Changes in currency translation adjustment and other	27,601	(32,264)	43,343	(18,578)
Amortization of pension and postretirement items	7,672	7,446	15,781	14,870
Income tax expense related to amortization of pension and postretirement items	(2,467)	(2,479)	(5,512)	(5,187)
Amortization of pension and postretirement items, net of tax	5,205	4,967	10,269	9,682
Change in net actuarial loss and prior service cost	20	(17,367)	20	(17,367)
Income tax benefit related to change in net actuarial loss and prior service cost	180	6,345	180	6,345
Change in net actuarial loss and prior service cost, net of taxes	200	(11,022)	200	(11,022)
Other comprehensive income (loss), net of taxes	33,006	(38,319)	53,812	(19,918)
Comprehensive income	$ 83,822	$ 35,431	$ 142,777	$ 109,626