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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS (TABLES)
12 Months Ended
Dec. 31, 2013
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]  
Schedule of Accounts Receivable
  December 31,
  2013 2012
Accounts receivable$239,914 $254,841
Less: Allowance for doubtful accounts  (3,815)   (3,635)
 Accounts receivable, net$236,099 $251,206
       
Schedule of Change in Allowance for Doubtful Accounts
  December 31,
  2013 2012 2011
Balance, beginning of year$ 3,635 $ 3,559 $ 6,306
 Provision for doubtful accounts  695   368   363
 Uncollectible receivables written-off  (315)   (209)   (2,868)
 Effect of foreign currency  (200)   (83)   (242)
Balance, end of year$ 3,815 $ 3,635 $ 3,559
          
Schedule of Revenue from Significant Clients
     Year Ended December 31,
     2013 2012 2011
             
Telecommunications client    12%  10%  9%
             
Schedule of Accounts Receivable Outstanding from Significant Clients
Accounts receivable from this client was as follows (amounts in thousands):   
             
     Year Ended December 31,
     2013 2012 2011
             
Telecommunications client   $ 24,120 $ 25,471 $ 19,093