Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	$ 32,334	$ 32,093
Finite-Lived Intangible Assets, Accumulated Amortization, Total	23,556	20,912
Patents [Member]
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	8,947	8,947
Finite-Lived Intangible Assets, Accumulated Amortization, Total	2,831	2,099
Trademarks [Member]
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	5,843	5,834
Finite-Lived Intangible Assets, Accumulated Amortization, Total	5,468	5,070
Customer lists [Member]
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	7,359	7,215
Finite-Lived Intangible Assets, Accumulated Amortization, Total	5,802	5,264
Know-how (a) [Member]
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	8,950	8,915
Finite-Lived Intangible Assets, Accumulated Amortization, Total	8,453	7,798
Non-compete agreement [Member]
Finite intangible assets net
Other Finite-Lived Intangible Assets, Gross Carrying Value Total	1,235	1,182
Finite-Lived Intangible Assets, Accumulated Amortization, Total	$ 1,002	$ 681