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Goodwill (Tables)
9 Months Ended
Sep. 29, 2012
Goodwill  
Schedule of changes in the carrying amount of goodwill

   The changes in the carrying amount of goodwill for the fiscal year to date period ended September 29, 2012 are as follows (in thousands):

Balance at December 31, 2011

  $ 140,654  

Goodwill adjustments related to sale of practice

    (29 )

Effect of foreign currency translation adjustments

    1,758  
       

Balance at September 29, 2012

  $ 142,383