Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net earnings	$ 304,768	$ 218,341	$ 237,871
Other comprehensive (loss) income:
Changes in cumulative translation adjustment and other	(99,933)	(71,962)	(21,985)
Amortization of pension and postretirement items	27,731	18,601	33,219
Income tax expense related to amortization of pension and postretirement items	(9,637)	(6,411)	(11,739)
Amortization of pension and postretirement items, net of tax	18,094	12,190	21,480
Reclassification of net actuarial loss from pension settlement	0	97,231	0
Change in net actuarial loss and prior service credit	(23,979)	(281,173)	236,855
Income tax benefit (expense) related to change in net actuarial loss and prior service credit	13,353	61,692	(86,979)
Change in net actuarial loss and prior service credit, net of taxes	(10,626)	(122,250)	149,876
Other comprehensive (loss) income, net of taxes	(92,465)	(182,022)	149,371
Comprehensive income	$ 212,303	$ 36,319	$ 387,242