Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	$ 67,564		$ 59,516
Accumulated Amortization	(20,404)		(19,304)
Accumulated Impairment Loss	(19,258)		(19,258)
Net Carrying Value, ending balance	$ 27,902		20,954
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	15 years	15 years
Gross Carrying Amount, beginning balance	$ 7,100		7,100
Accumulated Amortization	(1,665)		(1,631)
Accumulated Impairment Loss	(4,179)		(4,179)
Net Carrying Value, ending balance	$ 1,256		1,290
Existing technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	13 years	13 years
Gross Carrying Amount, beginning balance	$ 12,600		12,600
Accumulated Amortization	(4,282)		(4,141)
Accumulated Impairment Loss	(4,328)		(4,328)
Net Carrying Value, ending balance	$ 3,990		4,131
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years	11 years
Gross Carrying Amount, beginning balance	$ 33,500		33,500
Accumulated Amortization	(13,284)		(12,819)
Accumulated Impairment Loss	(10,751)		(10,751)
Net Carrying Value, ending balance	$ 9,465		9,930
Reacquired rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	3 years
Gross Carrying Amount, beginning balance	$ 7,500
Accumulated Amortization	(125)
Accumulated Impairment Loss	0
Net Carrying Value, ending balance	$ 7,375
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	8 years	8 years
Gross Carrying Amount, beginning balance	$ 6,316		6,316
Accumulated Amortization	(912)		(713)
Accumulated Impairment Loss	0		0
Net Carrying Value, ending balance	$ 5,404		$ 5,603
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	1 year
Gross Carrying Amount, beginning balance	$ 548
Accumulated Amortization	(136)
Accumulated Impairment Loss	0
Net Carrying Value, ending balance	$ 412