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Net Income (Loss) Per Share
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Net Loss Per Share
3.  Net Income (Loss) Per Share

Our basic net income (loss) per share amounts have been computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. For the nine months ended September 30, 2011, we reported net income, and the computation of diluted earnings per share is based upon the weighted-average number of our common shares and dilutive effect, determined using the treasury stock method, of potential common shares outstanding. For the three months ended September 30, 2011 and for the three and nine months ended September 30, 2010, we reported net losses and, therefore, potential common shares are not included since inclusion would have been anti-dilutive. The calculations of net income (loss) per share, basic and diluted, for these periods are as follows:

   
Net Income (Loss)
(Numerator)
  
Weighted Average
Common Shares
(Denominator)
  
Per Share
Amount
 
Three months ended September 30, 2011
         
Basic and diluted
 $(11,432 )  33,710  $(0.34 )
Nine months ended September 30, 2011
            
Basic
 $21,127   33,501  $0.63 
Dilutive effect of stock options
  -   142     
Dilutive effect of restricted stock
  -   21     
Diluted
 $21,127   33,664  $0.63 
Three months ended September 30, 2010
            
Basic and diluted
 $(17,101 )  32,814  $(0.52 )
Nine months ended September 30, 2010
            
Basic and diluted
 $(50,925 )  32,444  $(1.57 )

For the three and nine months ended September 30, 2011 and 2010, anti-dilutive common shares excluded from diluted per share amounts consist of the following:

   
Three Months Ended September 30,
 
   
2011
  
2010
 
   
Weighted
Average
Number
  
Weighted
Average
Exercise Price
  
Weighted
Average
Number
  
Weighted
Average
Exercise Price
 
Stock options
  6,186  $12.65   5,377  $14.34 
Restricted stock
  9       11     
Total
  6,195       5,388     

   
Nine Months Ended September 30,
 
   
2011
  
2010
 
   
Weighted
Average
Number
  
Weighted
Average
Exercise Price
  
Weighted
Average
Number
  
Weighted
Average
Exercise Price
 
Stock options
  4,126  $15.78   4,949  $15.52 
Restricted stock
  -       34     
Total
  4,126       4,983