Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended			21 Months Ended
	Mar. 25, 2014	Aug. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Nov. 26, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of discontinued operations			$ 0	$ (12)	$ (534)
Crescent Lighting Limited (CLL)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of discontinued operations		$ (44)		$ 0	(44)
Accumulated other comprehensive income reclassification adjustment for foreign currency translation adjustment		$ (469)
Pool products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale								$ 5,200
Non-compete period	5 years
Cash held in escrow					$ 300	$ 300	$ 300	$ 500
Escrow releases	$ 100					$ 200
Number of additional months to receive payments	4 months