Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 54,169	$ 49,826	$ 58,854
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net	(7,527)	27,840	(12,271)
Change in unrealized loss on derivative instruments, net of tax expense of $1, $31, and $6, respectively	2	51	9
Pension plan adjustments, net of tax (benefit) expense of ($3,701), $7,661, and ($2,412), respectively	(11,559)	12,688	(3,993)
Other comprehensive (loss) income	(19,084)	40,579	(16,255)
Total comprehensive income	$ 35,085	$ 90,405	$ 42,599