Goodwill and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Components of other intangibles
Gross Carrying Value	$ 8,709	$ 8,695
Accumulated Amortization	3,744	3,504
Net Carrying Value	4,965	5,191
Patents [Member]
Components of other intangibles
Gross Carrying Value	5,116	5,108
Accumulated Amortization	1,479	1,339
Net Carrying Value	3,637	3,769
Trademarks and technology licenses [Member]
Components of other intangibles
Gross Carrying Value	1,158	1,157
Accumulated Amortization	844	821
Net Carrying Value	314	336
Customer relationships [Member]
Components of other intangibles
Gross Carrying Value	1,764	1,757
Accumulated Amortization	1,064	1,001
Net Carrying Value	700	756
Other intangible assets [Member]
Components of other intangibles
Gross Carrying Value	671	673
Accumulated Amortization	357	343
Net Carrying Value	$ 314	$ 330