Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Sales	$ 67,211	$ 76,805	$ 205,218	$ 228,289
Cost of sales	44,060	51,435	135,770	154,103
Gross profit	23,151	25,370	69,448	74,186
Selling, general and administrative expenses	19,992	19,925	60,221	60,596
Research & development	3,296	3,611	9,953	10,715
Restructuring	182	877	608	877
Other expense (income), net	321	201	249	276
(Loss) income from operations	(640)	756	(1,583)	1,722
Interest expense	142	161	427	472
Interest income	(56)	(40)	(192)	(80)
(Loss) income before income taxes	(726)	635	(1,818)	1,330
Income tax expense	657	962	666	1,479
Net loss	$ (1,383)	$ (327)	$ (2,484)	$ (149)
Per share data:
Basic loss per share:	$ (0.11)	$ (0.03)	$ (0.19)	$ (0.01)
Diluted loss per share:	(0.11)	(0.03)	(0.19)	(0.01)
Cash dividends declared per share:	$ 0.02	$ 0.02	$ 0.06	$ 0.06