Consolidated Statements of (Loss) Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Income Statement [Abstract]
Net sales	$ 277,946	$ 301,441
Cost of sales	232,371	232,129
Gross margin	45,575	69,312
Selling, general, and administrative expense	30,744	40,064
Research and development expense	4,185	3,740
Goodwill impairment charges	9,053	0
Held-for-sale impairment charges	1,713	0
Restructuring charges	2,164	0
Other - net	2,279	4,121
Operating (loss) profit	(4,563)	21,387
Other non-operating (income) expense - net	(944)	245
Interest expense—net	246	466
(Loss) Income before income taxes	(3,865)	20,676
Income tax (benefit) expense	(762)	3,770
Net (loss) income	$ (3,103)	$ 16,906
Basic earnings per share:
Net (loss) income per share of common stock (in dollars per share)	$ (0.15)	$ 0.83
Diluted earnings per share:
Net (loss) income per share of common stock (in dollars per share)	$ (0.15)	$ 0.82
Weighted-average number of shares of common stock outstanding:
Basic (in shares)	20,384	20,267
Diluted (in shares)	20,384	20,606