Consolidated Statements of Earnings - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) UNAUDITED
Net sales	$ 100,071	$ 102,980	$ 198,382	$ 203,686
Costs and expenses:
Cost of goods sold	66,698	69,157	132,873	139,248
Selling, general and administrative expenses	15,224	15,813	30,935	29,454
Research and development expenses	5,487	5,332	10,686	10,958
Restructuring and impairment charges	2,118	2,733	2,856	3,236
Operating earnings	10,544	9,945	21,032	20,790
Other (expense) income:
Interest expense	(653)	(582)	(1,241)	(1,195)
Interest income	853	688	1,641	1,252
Other	115	(409)	(1,569)	(2,180)
Total other (expense) income	315	(303)	(1,169)	(2,123)
Earnings from continuing operations before taxes	10,859	9,642	19,863	18,667
Income tax (benefit) expense	(8,221)	3,281	(5,504)	7,226
Net earnings	$ 19,080	$ 6,361	$ 25,367	$ 11,441
Earnings per share:
Basic (in dollars per share)	$ 0.58	$ 0.19	$ 0.76	$ 0.34
Diluted (in dollars per share)	$ 0.57	$ 0.19	$ 0.75	$ 0.33
Basic weighted - average common shares outstanding (in shares):	33,080	33,741	33,243	33,725
Effect of dilutive securities (in shares)	471	467	497	519
Diluted weighted - average common shares outstanding (in shares)	33,551	34,208	33,740	34,244
Cash dividends declared per share (in dollars per share)	$ 0.040	$ 0.040	$ 0.080	$ 0.080