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NET INCOME PER SHARE
 12 Months Ended
Dec. 31, 2013
NET INCOME PER SHARE [Abstract]  
NET INCOME PER SHARE

(19)       NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted shares for the periods indicated (amounts in thousands):

    Year Ended December 31,
    2013 2012 2011
         
Shares used in basic earnings per share calculation 51,338  54,738  56,669
 Effect of dilutive securities:     
  Stock options 417  378  727
  Restricted stock units 489  424  564
  Performance-based restricted stock units -  -  3
   Total effects of dilutive securities 906  802  1,294
Shares used in dilutive earnings per share calculation 52,244  55,540  57,963
         

For the years ended December 31, 2013, 2012 and 2011, 0.1 million, 0.1 million and 0.1 million, respectively, of options to purchase shares of common stock were outstanding but not included in the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the years ended December 31, 2013, 2012 and 2011, restricted stock units of 0.2 million, 0.8 million, and 0.6 million, respectively, were outstanding but not included in the computation of diluted net income per share because the effect would have been anti-dilutive. For the years ended December 31, 2013, 2012 and 2011, there were no performance-based restricted stock units outstanding but not included in the computation of diluted net income per share. For the years ended December 31, 2013, 2012 and 2011, restricted stock units that vest based on the Company achieving specified operating income performance targets of 0.1 million, 0.1 million and 0.1 million, respectively, were outstanding but not included in the computation of diluted net income per share because they were determined not to be contingently issuable.