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Goodwill (Tables)
 3 Months Ended
Mar. 29, 2014
Goodwill  
Schedule of changes in the carrying amount of goodwill

 The changes in the carrying amount of goodwill during the fiscal quarter ended March 29, 2014, are as follows (in thousands):

 
   Goodwill,
gross		   Accumulated
impairment
losses		   Goodwill, net  

Balance at December 28, 2013

   $ 153,466   $ (71,893 ) $ 81,573  

Goodwill adjustments related to acquisitions

     1,886     —     1,886  

Effect of foreign currency translation

     137     —     137  
               
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Balance at March 29, 2014

   $ 155,489   $ (71,893 ) $ 83,596  
               
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        The changes in the carrying amount of goodwill during the fiscal quarter ended March 30, 2013, are as follows (in thousands):

 
   Goodwill,
gross		   Accumulated
impairment
losses		   Goodwill, net  

Balance at December 31, 2012

   $ 142,658   $ (71,893 ) $ 70,765  

Goodwill adjustments related to acquisition

     5,565     —     5,565  

Effect of foreign currency translation

     (823 )   —     (823 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at March 30, 2013

   $ 147,400   $ (71,893 ) $ 75,507  
               
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