Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 14,125	$ 14,066
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2,918)	6,013
Unrealized gain on derivative instruments, net of tax expense of $0 and $1, respectively	1	1
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $940 and $709, respectively	2,936	2,217
Other comprehensive income	19	8,231
Comprehensive income	$ 14,144	$ 22,297