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NET INCOME PER SHARE
 6 Months Ended
Jun. 30, 2011
NET INCOME PER SHARE [Abstract]  
NET INCOME PER SHARE

(12)       NET INCOME PER SHARE

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

    Three Months Ended June 30, Six Months Ended June 30,
    2011 2010 2011 2010
Shares used in basic earnings per share calculation  56,713   61,117   56,949   61,495
 Effect of dilutive securities:           
  Stock options  832   801   891   914
  Restricted stock units  429   399   536   498
   Total effects of dilutive securities  1,261   1,200   1,427   1,412
Shares used in dilutive earnings per share calculation  57,974   62,317   58,376   62,907
               

For the three months ended June 30, 2011 and 2010, options to purchase 0.1 million and 0.2 million shares of common stock, respectively, 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 six months ended June 30, 2011 and 2010, options to purchase 0.1 million and 0.2 million shares of common stock, 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 three months ended June 30, 2011 and 2010, restricted stock units (“RSUs”) of 0.6 million and 1.4 million, respectively, and for the six months ended June 30, 2011 and 2010, RSUs of 0.6 million and 1.1 million, respectively, were outstanding, but not included in the computation of diluted net income per share because the effect would have been anti-dilutive.