Note 7. Intangible Assets and Goodwill
 3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Text Block]
7. Intangible Assets and Goodwill

Intangible Assets

          The following table presents the balance of intangible assets as of the dates indicated below:

   
March 31, 2013
   
December 30, 2012
 
   
(in thousands)
 
   
Gross Amount
   
Accumulated Amortization
   
Net Amount
   
Gross Amount
   
Accumulated Amortization
   
Net Amount
 
Developed Technology
  $ 111,376     $ (39,485 )   $ 71,891     $ 111,376     $ (35,386 )   $ 75,990  
Customer relationships
    92,594       (27,592 )     65,002       93,264       (25,191 )     68,073  
Trade Names
    8,374       (3,597 )     4,777       8,374       (3,284 )     5,090  
Total
  $ 212,344     $ (70,674 )   $ 141,670     $ 213,014     $ (63,861 )   $ 149,153  

The changes in the gross balance of intangibles assets since December 30, 2012 resulted primarily from foreign currency translation adjustments.

The actual amortization expense and estimated future amortization expense for intangible assets are summarized below:

   
Three Months Ended
 
   
March 31, 2013
   
March 25, 2012
 
   
(in thousands)
 
Amortization expense
  $ 6,813     $ 6,661  

   
Estimated Future Amortization
 
   
(in thousands)
 
Fiscal 2013 (remaining 9 months)
  $ 20,118  
Fiscal 2014
    27,251  
Fiscal 2015
    27,251  
Fiscal 2016
    27,419  
Fiscal 2017
    16,270  
Fiscal 2018 and beyond
    23,361  
Total
  $ 141,670  

Goodwill

          The following table presents the balance of goodwill as of the dates indicated below:

   
March 31, 2013
   
December 30, 2012
 
   
(in thousands)
 
             
Goodwill
  $ 166,688     $ 166,931  

           The changes in the carrying amount of goodwill since December 30, 2012 resulted primarily from foreign currency translation adjustments.