Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Income Statement [Abstract]
Net sales	$ 213,959	$ 182,670	$ 599,171	$ 523,816
Cost of sales	147,084	121,537	407,926	355,573
Gross profit	66,875	61,133	191,245	168,243
Selling, general and administrative expenses	45,224	43,855	151,093	127,614
Goodwill, Impairment Loss	50,307	0	50,307	0
Costs of Transaction Services Agreement	3,019	1,154	11,532	1,154
Cost of Acquired Retention Plans	5,703	0	17,110	0
Restructuring costs	1,541	81	7,820	553
Gain (Loss) on Disposition of Business	0	0	(493)	0
Net loss (gain) on sale of assets	8	416	(5)	351
Operating (loss) income	(38,927)	15,627	(46,119)	38,571
Interest expense, net	5,327	4,058	14,382	14,595
Non-service pension and post retirement benefit income	(4,063)	(99)	(12,188)	(298)
Income from Transaction Services Agreement	(1,829)	(944)	(7,853)	(944)
Other (income) expense, net	(534)	185	(424)	(367)
(Loss) earnings from continuing operations before income taxes	(37,828)	12,427	(40,036)	25,585
Income tax expense (benefit)	679	2,297	(1,022)	3,244
Earnings from continuing operations	(38,507)	10,130	(39,014)	22,341
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	0	9,860	0	25,240
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	122,786	692	122,786
Earnings from discontinued operations, net of tax	0	132,646	692	148,026
Net (loss) earnings	$ (38,507)	$ 142,776	$ (38,322)	$ 170,367
Earnings per share:
Basic earnings per share from continuing operations	$ (1.39)	$ 0.36	$ (1.41)	$ 0.80
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0.00	4.75	0.03	5.30
Basic earnings per share (in usd per share)	(1.39)	5.11	(1.38)	6.10
Diluted earnings per share from continuing operations	(1.39)	0.36	(1.41)	0.79
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.00	4.72	0.03	5.27
Diluted earnings per share (in usd per share)	$ (1.39)	$ 5.08	$ (1.38)	$ 6.06
Average shares outstanding:
Basic (in shares)	27,687	27,952	27,718	27,941
Diluted (in shares)	27,687	28,117	27,718	28,104