Consolidated Statements of (Loss) Earnings - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) EARNINGS UNAUDITED
Net sales	$ 90,646	$ 99,957	$ 289,028	$ 303,643
Costs and expenses:
Cost of goods sold	59,200	67,458	192,073	206,706
Selling, general and administrative expenses	12,690	13,899	43,625	43,353
Research and development expenses	5,692	5,807	16,378	16,765
Environmental charge	14,541		14,541
Restructuring and impairment charges	2,373	1,570	5,229	4,806
Operating (loss) earnings	(3,850)	11,223	17,182	32,013
Other (expense) income:
Interest expense	(714)	(568)	(1,955)	(1,763)
Interest income	713	707	2,354	1,959
Other	(3,072)	562	(4,641)	(1,618)
Total other (expense) income	(3,073)	701	(4,242)	(1,422)
(Loss) earnings before income taxes	(6,923)	11,924	12,940	30,591
Income tax (benefit) expense	(2,163)	3,807	(7,667)	11,033
Net (loss) earnings	$ (4,760)	$ 8,117	$ 20,607	$ 19,558
(Loss) earnings per share:
Basic (in dollars per share)	$ (0.15)	$ 0.24	$ 0.62	$ 0.58
Diluted (in dollars per share)	$ (0.15)	$ 0.24	$ 0.61	$ 0.57
Basic weighted - average common shares outstanding (in shares):	32,770	33,599	33,083	33,683
Effect of dilutive securities (in shares)		508	485	515
Diluted weighted - average common shares outstanding (in shares)	32,770	34,107	33,568	34,198
Cash dividends declared per share (in dollars per share)	$ 0.040	$ 0.040	$ 0.120	$ 0.120