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NET INCOME PER SHARE (TABLES)
9 Months Ended
Sep. 30, 2013
NET INCOME PER SHARE [Abstract]  
Schedule of Diluted Shares Calculation
    Three Months Ended September 30, Nine Months Ended September 30,
    2013 2012 2013 2012
Shares used in basic earnings per share calculation 50,732  54,093  51,643  55,233
 Effect of dilutive securities:       
  Stock options 425  377  412  378
  Restricted stock units 521  435  444  380
  Performance-based restricted stock units -   -   -   -
   Total effects of dilutive securities 946  812  856  758
Shares used in dilutive earnings per share calculation 51,678  54,905  52,499  55,991