Goodwill and Other Identifiable Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill & Intangible Assets
Weighted Average Amortization Period	12 years 10 months 24 days	13 years 1 month 6 days
Gross Carrying Amount	$ 23,178	$ 22,642
Foreign Exchange	(286)	(107)
Accumulated Amortization	(17,290)	(15,147)
Net Carrying Amount	5,602	7,388
Amortization expense	2,140	1,968	1,757
Estimated amortization expense to be recognized during the next five years
2014	2,026
2015	1,360
2016	1,132
2017	333
2018	141
Patents
Goodwill & Intangible Assets
Weighted Average Amortization Period	20 years	20 years
Gross Carrying Amount	676	676
Accumulated Amortization	(592)	(548)
Net Carrying Amount	84	128
Customer Relationships
Goodwill & Intangible Assets
Weighted Average Amortization Period	15 years 10 months 24 days	15 years 10 months 24 days
Gross Carrying Amount	10,450	10,450
Foreign Exchange	(209)	(223)
Accumulated Amortization	(8,777)	(8,311)
Net Carrying Amount	1,464	1,916
Product Certification
Goodwill & Intangible Assets
Weighted Average Amortization Period	5 years 4 months 24 days	5 years 4 months 24 days
Gross Carrying Amount	7,905	7,369
Foreign Exchange	(34)	(3)
Accumulated Amortization	(5,237)	(3,917)
Net Carrying Amount	2,634	3,449
Unpatented Technology
Goodwill & Intangible Assets
Weighted Average Amortization Period	18 years 4 months 24 days	18 years 4 months 24 days
Gross Carrying Amount	3,183	3,183
Accumulated Amortization	(2,457)	(2,191)
Net Carrying Amount	726	992
Licenses
Goodwill & Intangible Assets
Weighted Average Amortization Period	20 years	20 years
Gross Carrying Amount	964	964
Foreign Exchange	(43)	119
Accumulated Amortization	(227)	(180)
Net Carrying Amount	$ 694	$ 903