Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Sales	$ 64,557	$ 67,822
Cost of sales	43,170	45,078
Gross profit	21,387	22,744
Selling, general and administrative expenses	18,022	20,593
Research & development	3,559	3,287
Restructuring	1,436	200
Other expense (income), net	155	(91)
Loss from operations	(1,785)	(1,245)
Interest expense	105	153
Interest income	(40)	(67)
Loss before income taxes	(1,850)	(1,331)
Income taxes	198	(86)
Net loss	$ (2,048)	$ (1,245)
Per share data:
Loss per share (in dollars per share)	$ (0.16)	$ (0.10)
Diluted loss per share (in dollars per share)	(0.16)	(0.10)
Cash dividends declared per share: (in dollars per share)	$ 0.02	$ 0.02