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Income (Loss) Per Share
 9 Months Ended
Sep. 30, 2018
Income (Loss) Per Share
Note 8 — Income (Loss) Per Share
 
The following table is a reconciliation of the weighted average shares used in the computation of income (loss) per share for the periods presented (in thousands, except per share data):

 
  
Three Months Ended September 30,
  
   
2018
    
2017
  
          Weighted                 Weighted        
   
Income
    
Average
    
Per-
    
Income
    
 Average
    
Per-
  
 
   (Loss)     Shares     Share     (Loss)     Shares     Share  
Income (loss) per share — basic
                                                
Net income (loss) available to common stockholders
  
$
15,682
      
23,106
    
$
0.68
    
$
(17,614
)
    
22,772
    
$
(0.77
)
Effect of dilutive securities:
                                                
Convertible senior notes
    
1,487
      
21,426
              
—
      
—
          
Unvested performance stock grants
    
—
      
832
              
—
      
—
          
Unvested restricted stock grants
    
—
      
322
              
—
      
—
          
Income (loss) per share — diluted
                                                
Net income (loss) available to common
stockholders plus assumed exercises and conversion
  
$
17,169
      
45,686
    
$
0.38
    
$
(17,614
)
    
22,772
    
$
(0.77
)
 
 
   
Nine Months Ended September 30,
  
   
2018
    
2017
  
          Weighted                 Weighted        
   
Income
    
Average
    
Per-
    
Income
    
Average
    
Per-
  
 
   (Loss)     Shares     Share     (Loss)     Shares     Share  
Income (loss) per share — basic
                                                
Net income (loss) available to common stockholders
  
$
(39,121
)
    
23,104
    
$
(1.69
)
  
$
(52,672
)
    
20,848
    
$
(2.53
)
Effect of dilutive securities:
                                                
Convertible senior notes
    
—
      
—
              
—
      
—
          
Unvested performance stock grants
    
—
      
—
              
—
      
—
          
Unvested restricted stock grants
    
—
      
—
              
—
      
—
          
Income (loss) per share — diluted
                                                
Net income (loss) available to common
stockholders plus assumed exercises and conversion
  
$
(39,121
)
    
23,104
    
$
(1.69
)
  
$
(52,672
)
    
20,848
    
$
(2.53
)


Basic income (loss) per share is calculated using the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated using the weighted average number of common shares and common share equivalents outstanding during the period (which consist of warrants, options, restricted stock awards, restricted stock units and convertible debt to the extent they are dilutive). The weighted average number of common shares outstanding excludes shares repurchased pursuant to a prepaid forward share repurchase agreement associated with the issuance of the convertible senior notes due 2020. Common share equivalents that could potentially dilute basic earnings per share in the future, which were excluded from the computation of diluted earnings per share due to being anti-dilutive, totaled approximately 2,894,029 and 20,215,325 for the three months ended September 30, 2018 and 2017, respectively, and 25,332,390 and 21,502,935 for the nine months ended September 30, 2018 and 2017, respectively.