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Intangible Assets, Other than Goodwill
 12 Months Ended
Dec. 31, 2011
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Disclosure [Text Block]
Note 7. Intangible Assets, Other than Goodwill

 

    December 31, 2010  
    Gross 
carrying 
amount		     Weighted
average
amortization
period		   Accumulated
amortization		  
          (in thousands)
                 
Technology   $ 6,339     7 years     3,609  
Customer relationship     8,100     7 years     4,532  
Patents     842     6 years     466  
Total   $ 15,281           8,607  

 

    December 31, 2011  
    Gross 
carrying 
amount		     Weighted
average
amortization
period		   Accumulated
amortization		  
          (in thousands)      
                 
Technology   $ 6,339     7 years     4,495  
Customer relationship     8,100     7 years     5,689  
Patents     842     6 years     603  
Total   $ 15,281           10,787  

  

Amortization expense for the years ended December 31, 2009, 2010 and 2011, was $2,193 thousand, $2,198 thousand and $2,180 thousand, respectively. Estimated amortization expense for the next five years is $2,126 thousand in 2012 and 2013, $177 thousand in 2014, and $7 thousand in 2015 and 2016.