Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 262,477	$ 304,768	$ 218,341
Changes in cumulative translation adjustment and other	(70,590)	(99,933)	(71,962)
Other comprehensive loss:
Amortization of pension and postretirement items	29,493	27,731	18,601
Income tax expense related to amortization of pension and postretirement items	(10,452)	(9,637)	(6,411)
Amortization of pension and postretirement items, net of tax	19,041	18,094	12,190
Reclassification of net actuarial loss from pension settlement	0	0	97,231
Change in net actuarial loss and prior service credit	(98,092)	(23,979)	(281,173)
Income tax benefit (expense) related to change in net actuarial loss and prior service credit	28,344	13,353	61,692
Change in net actuarial loss and prior service credit, net of taxes	(69,748)	(10,626)	(122,250)
Other comprehensive loss, net of taxes	(121,297)	(92,465)	(182,022)
Comprehensive income	$ 141,180	$ 212,303	$ 36,319