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Goodwill (Tables)
6 Months Ended
Jun. 29, 2013
Goodwill  
Schedule of changes in the carrying amount of goodwill

  The changes in the carrying amount of goodwill during the fiscal year to date period ended June 29, 2013, are as follows (in thousands):

 
  Goodwill,
gross
  Accumulated
impairment
losses
  Goodwill, net  

Balance at December 29, 2012

  $ 142,658   $ (71,893 ) $ 70,765  

Goodwill adjustments related to acquisition

    5,358         5,358  

Goodwill adjustments related to NeuCo

    (63 )       (63 )

Effect of foreign currency translation

    (787 )       (787 )
               

Balance at June 29, 2013

  $ 147,166   $ (71,893 ) $ 75,273  
               

        The changes in the carrying amount of goodwill during the fiscal year to date period ended June 30, 2012, are as follows (in thousands):

 
  Goodwill,
gross
  Accumulated
impairment
losses
  Goodwill, net  

Balance at December 31, 2011

  $ 141,153   $ (499 ) $ 140,654  

Effect of foreign currency translation

    377         377  
               

Balance at June 30, 2012

  $ 141,530   $ (499 ) $ 141,031