Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 13,466	$ 15,094	$ 27,591	$ 29,160
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments and other	1,329	(11,969)	(1,588)	(5,955)
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $940 and $703 and $1,880 and $1,413, respectively	2,936	2,203	5,872	4,420
Other comprehensive income (loss)	4,265	(9,766)	4,284	(1,535)
Comprehensive income	$ 17,731	$ 5,328	$ 31,875	$ 27,625