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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 28, 2013
Goodwill and Other Intangible Assets  
Goodwill and Other Intangible Assets

10. Goodwill and Other Intangible Assets

Goodwill

        The following summarizes the activity in goodwill for the years ended December 28, 2013 and December 29, 2012 (in thousands):

 
  Year Ended  
 
  December 28,
2013
  December 29,
2012
 

Beginning balance

  $ 130,265   $ 115,489  

Additions due to business combinations

    98,516     14,776  
           

Ending balance

  $ 228,781   $ 130,265  
           
           

Other Intangible Assets

        The gross carrying amount and accumulated amortization of other intangible assets are as follows (in thousands):

 
   
  December 28, 2013   December 29, 2012  
 
  Weighted-Average
Amortization
Period
(Years)
 
 
  Gross
Amount
  Accumulated
Amortization
  Gross
Amount
  Accumulated
Amortization
 

Intangible assets:

                             

Subject to amortization:

                             

Core and developed technology

  9   $ 138,340   $ (41,782 ) $ 95,420   $ (30,145 )

Customer relationships

  9     14,500     (2,330 )   8,100     (1,057 )

Patents

  6     3,000     (750 )   3,000     (250 )

Trademarks

  10     2,210     (195 )   910     (38 )
                       

 

  9     158,050     (45,057 )   107,430     (31,490 )

Not subject to amortization:

 

 

   
 
   
 
   
 
   
 
 

In-process research and development

  Not amortized     18,600         14,810      
                       

Total intangible assets

      $ 176,650   $ (45,057 ) $ 122,240   $ (31,490 )
                       
                       

        Gross intangible assets increased $55.4 million in fiscal 2013 due to the acquisition of Energy Micro. This increase was offset by the removal of $1.0 million of fully amortized assets.

        Amortization expense related to intangible assets for fiscal 2013, 2012 and 2011 was $14.6 million, $10.7 million and $9.9 million, respectively. The estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years is as follows (in thousands):

Fiscal Year
   
 

2014

  $ 17,060  

2015

    16,669  

2016

    16,019  

2017

    15,052  

2018

    14,309