Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Income Statement [Abstract]
Net sales	$ 457,388	$ 463,327
Cost of sales	320,603	329,220
Gross profit	136,785	134,107
Selling, general and administrative expenses	113,216	111,753
Restructuring costs	266	1,693
Net gain on sale of assets	(61)	(63)
Operating income	23,364	20,724
Interest expense, net	5,313	5,352
Non-service pension and post retirement benefit cost (income)	(99)	(3,029)
Other income, net	(91)	(342)
Earnings before income taxes	18,241	18,743
Income tax expense	4,116	4,677
Net earnings	$ 14,125	$ 14,066
Earnings per share:
Basic earnings per share (in usd per share)	$ 0.51	$ 0.51
Diluted earnings per share (in usd per share)	$ 0.50	$ 0.50
Average shares outstanding:
Basic (in shares)	27,908	27,851
Diluted (in shares)	28,070	28,168