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NET INCOME PER SHARE (TABLES)
3 Months Ended
Mar. 31, 2013
NET INCOME PER SHARE [Abstract]  
Schedule of Diluted Shares Calculation
    Three Months Ended March 31,
    2013 2012
Shares used in basic earnings per share calculation  52,347   56,493
 Effect of dilutive securities:     
  Stock options  391   396
  Restricted stock units  479   529
  Performance-based restricted stock units  -    -
   Total effects of dilutive securities  870   925
Shares used in dilutive earnings per share calculation  53,217   57,418