Discontinued Operations - Components Included in Loss (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net sales										$ 0	$ 1,078
Cost of sales										0	588
Gross Profit										0	490
Operating expenses of discontinued operations										0	657
Other expenses										0	0
Loss on disposal of discontinued operations									$ 0	(12)	(534)
(Loss) income from discontinued operations before income taxes									0	(12)	(701)
Benefit from income taxes									0	0	(10)
(Loss) from discontinued operations	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (12)	$ 0	$ (12)	$ (691)