Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 73,750	$ 85,159	$ 129,544	$ 137,948
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(32,264)	27,027	(18,578)	(30,345)
Other comprehensive income (loss):
Amortization of pension and postretirement items	7,446	6,834	14,869	13,892
Income tax expense related to amortization of pension and postretirement items	(2,479)	(2,366)	(5,187)	(4,814)
Amortization of pension and postretirement items, net of tax	4,967	4,468	9,682	9,078
Change in net actuarial loss and prior service cost	(17,367)	(8,526)	(17,367)	(8,526)
Income tax benefit related to change in net actuarial loss and prior service cost	6,345	3,205	6,345	3,205
Change in net actuarial loss and prior service cost, net of taxes	(11,022)	(5,321)	(11,022)	(5,321)
Other comprehensive income (loss), net of taxes	(38,319)	26,174	(19,918)	(26,588)
Comprehensive income	$ 35,431	$ 111,333	$ 109,626	$ 111,360