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Goodwill (Tables)
3 Months Ended
Mar. 31, 2012
Goodwill [Abstract]  
Goodwill
     Goodwill  

Balance as of December 31, 2011

   $ 189,423   

Foreign currency translation adjustments

     425   
  

 

 

 

Balance as of March 31, 2012

   $ 189,848