Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 199,600,000	$ 192,800,000	$ 574,000,000	$ 549,500,000
Cost of sales	158,300,000	151,400,000	455,000,000	433,900,000
Gross margin	41,300,000	41,400,000	119,000,000	115,600,000
Operating expenses	38,200,000	33,600,000	113,300,000	94,700,000
Operating income	3,100,000	7,800,000	5,700,000	20,900,000
Interest expense, net	900,000	500,000	2,200,000	1,600,000
Income from continuing operations before income taxes	2,200,000	7,300,000	3,500,000	19,300,000
Income tax expense	900,000	2,500,000	800,000	7,100,000
Income from continuing operations	1,300,000	4,800,000	2,700,000	12,200,000
Income (loss) from discontinued operations, net of taxes	100,000	(100,000)	0	4,300,000
Net income	$ 1,400,000	$ 4,700,000	$ 2,700,000	$ 16,500,000
Income from continuing operations per share - basic and diluted	$ 0.05	$ 0.19	$ 0.10	$ 0.48
Income (loss) from discontinued operations per share - basic and diluted	0.00	0.00	0.00	0.17
Net income per share - basic and diluted	$ 0.05	$ 0.19	$ 0.10	$ 0.65
Weighted average shares outstanding:
Basic and diluted shares outstanding	24.9	24.6	24.8	24.5