Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Income Statement [Abstract]
Net sales	$ 174,712	$ 178,606	$ 341,146	$ 358,001
Cost of sales	122,123	125,165	234,036	251,380
Gross profit	52,589	53,441	107,110	106,621
Selling, general and administrative expenses	41,808	45,939	83,759	88,871
Restructuring costs	206	1,804	472	3,497
Net gain on sale of assets	0	(1,528)	(65)	(1,589)
Operating income	10,575	7,226	22,944	15,842
Interest expense, net	5,236	5,000	10,537	10,323
Non-service pension and post retirement benefit income	(100)	(3,039)	(199)	(6,068)
Other (income) expense, net	(463)	364	(552)	22
Earnings from continuing operations before income taxes	5,902	4,901	13,158	11,565
Income tax (benefit) expense	(487)	123	947	1,817
Earnings from continuing operations	6,389	4,778	12,211	9,748
Earnings from discontinued operations, net of tax	7,077	10,316	15,380	19,412
Net earnings	$ 13,466	$ 15,094	$ 27,591	$ 29,160
Earnings per share:
Basic earnings per share from continuing operations	$ 0.23	$ 0.17	$ 0.44	$ 0.35
Basic earnings per share from discontinued operations	0.25	0.37	0.55	0.69
Basic earnings per share (in usd per share)	0.48	0.54	0.99	1.04
Diluted earnings per share from continuing operations	0.23	0.17	0.43	0.34
Diluted earnings per share from discontinued operations	0.25	0.36	0.55	0.69
Diluted earnings per share (in usd per share)	$ 0.48	$ 0.53	$ 0.98	$ 1.03
Average shares outstanding:
Basic (in shares)	27,961	27,971	27,935	27,911
Diluted (in shares)	28,123	28,349	28,097	28,258