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NET INCOME PER SHARE (TABLES)
12 Months Ended
Dec. 31, 2014
NET INCOME PER SHARE [Abstract]  
Schedule of Diluted Shares Calculation
    Year Ended December 31,
    2014 2013 2012
         
Shares used in basic earnings per share calculation 49,297  51,338  54,738
 Effect of dilutive securities:     
  Stock options 413  417  378
  Restricted stock units 392  489  424
  Performance-based restricted stock units -  -  -
   Total effects of dilutive securities 805  906  802
Shares used in dilutive earnings per share calculation 50,102  52,244  55,540