CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings		$ 214,891	$ 187,329	$ 145,461
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Foreign currency translation, net of tax	[1]	77,942	(64,840)	(87,527)
Pension and postretirement adjustments, net of tax	[2]	(3,026)	(988)	(9,990)
Other Comprehensive Income (Loss), Net of Tax		74,916	(65,828)	(97,517)
Comprehensive Income		$ 289,807	$ 121,501	$ 47,944

[1] The tax benefit (expense) included in other comprehensive income for foreign currency translation adjustments for 2017, 2016, and 2015 were ($1.9) million, $1.7 million, and $2.7 million, respectively.

[2] The tax benefit (expense) included in other comprehensive income for pension and postretirement adjustments for 2017, 2016, and 2015 were $2.8 million, ($1.7) million, and $9.5 million, respectively.