Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 58,623	$ 84,752	$ 147,588	$ 214,296
Other comprehensive income (loss):
Changes in currency translation adjustment and other	27,648	(19,296)	70,991	(37,874)
Amortization of pension and postretirement items	7,960	7,171	23,741	22,040
Income tax expense related to amortization of pension and postretirement items	(2,812)	(2,667)	(8,324)	(7,854)
Amortization of pension and postretirement items, net of taxes	5,148	4,504	15,417	14,186
Change in net actuarial loss and prior service cost	870	0	890	(17,367)
Income tax benefit related to change in net actuarial loss and prior service cost	(260)	0	(80)	6,345
Change in net actuarial loss and prior service cost, net of taxes	610	0	810	(11,022)
Other comprehensive income (loss), net of taxes	33,406	(14,792)	87,218	(34,710)
Comprehensive income	$ 92,029	$ 69,960	$ 234,806	$ 179,586