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Net Income (Loss) Per Share
6 Months Ended
Jun. 30, 2011
Net Income (Loss) Per Share
10.   Net Income (Loss) Per Share

Basic net income (loss) per share amounts have been computed based on the weighted-average number of common shares outstanding.  Diluted net income (loss) per share amounts have been computed based on the weighted-average number of common shares outstanding plus the dilutive effect of potential common shares.  The computation of potential common shares has been performed using the treasury stock method.  The changes in income or loss that would result if the warrants were reported as an equity instrument are reflected as an adjustment to the numerator.  When net loss is reported, diluted and basic net loss per share amounts are the same as the impact of potential common shares is antidilutive.

The calculation of net income (loss) and the number of shares used to compute basic and diluted earnings per share for the three and six-month periods ended June 30, 2011 and 2010 are as follows:

   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
In thousands
 
2011
   
2010
   
2011
   
2010
 
                         
Net income (loss)
  $ (47,762 )   $ 159,348     $ (85,711 )   $ 135,950  
Impact of assumed exercise of warrants
    ---       (2,138 )     ---       3,942  
Adjusted net income (loss)
  $ (47,762 )   $ 157,210     $ (85,711 )   $ 139,892  

Weighted average shares outstanding - basic
    132,021       110,290       130,518       109,657  
Dilutive stock options
    ---       633       ---       508  
Restricted stock and restricted stock units
    ---       1,148       ---       930  
Warrants
    ---       4,008       ---       3,278  
Weighted average shares outstanding ­- diluted
    132,021       116,079       130,518       114,373  

For the three-month and six-month periods ended June 30, 2011 and 2010, the following potentially dilutive securities were not included in the computation of net income (loss) per share because the effect would be anti-dilutive:

   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
In thousands
 
2011
   
2010
   
2011
   
2010
 
                         
Stock options
    6,958       6,100       6,958       6,269  
Restricted stock and restricted stock units
    2,791       ---       2,791       ---  
Warrants
    6,038       ---       6,038       ---  
      15,787       6,100       15,787       6,269