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Goodwill (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Goodwill
         
   2011   2012 
         
Beginning balance  $3,918   $4,580 
Goodwill acquired in acquisitions of business   458    - 
Exchange rate differences   204    48 
Ending balance   4,580    4,628