Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 16,280	$ 17,455	$ 36,029	$ 43,727
Foreign currency translation adjustments	7,731	1,050	24,105	1,085
Unrealized gain (loss) on derivative instruments, net of tax expense (benefit) of ($43) and $205 and $72 and ($227), respectively	(70)	338	121	(374)
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $1,309 and $1,213 and $3,979 and $3,641, respectively	2,220	2,005	6,588	6,015
Other comprehensive income	9,881	3,393	30,814	6,726
Comprehensive income	$ 26,161	$ 20,848	$ 66,843	$ 50,453