Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net earnings	$ 218,575	$ 237,792	$ 209,979
Other comprehensive (loss) income:
Changes in cumulative translation adjustment and other	(71,962)	(21,985)	29,641
Amortization of pension and postretirement items	18,601	33,219	28,674
Income tax expense related to amortization of pension and postretirement items	(6,411)	(11,739)	(10,016)
Amortization of pension and postretirement items, net of tax	12,190	21,480	18,658
Reclassification of net actuarial loss from pension settlement	97,231	0	0
Change in net actuarial loss and prior service credit	(281,173)	236,855	(109,765)
Income tax benefit (expense) related to change in net actuarial loss and prior service credit	61,692	(86,979)	41,012
Change in net actuarial loss and prior service credit, net of taxes	(122,250)	149,876	(68,753)
Other comprehensive (loss) income, net of taxes	(182,022)	149,371	(20,454)
Comprehensive income	$ 36,553	$ 387,163	$ 189,525