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Intangibles and Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of intangibles and other assets    
Patents and trademarks $ 27,057 $ 26,206
Other assets 192 192
Gross intangibles and other assets 27,249 26,398
Accumulated amortization of patents and trademarks (10,978) (10,673)
Intangibles and other assets, net $ 16,271 $ 15,725