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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill
Balance as of January 1, 2011   $ 23,021  
         
Goodwill acquired during the year (see Note 1(b), 1(d),1(e))     19,517  
Foreign currency translation adjustments     (96 )
         
Balance as of December 31, 2011     42,442  
         
Foreign currency translation adjustments     513  
         
Balance as of December 31, 2012   $ 42,955