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Earnings Per Share
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Earnings Per Share
(11)
Earnings Per Share


The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):

  
Three months ended September 30,
    
Nine months ended September 30,
  
   
2020
    
2019
    
2020
    
2019
  
Net earnings (loss) attributable to Kirby
  
$
27,489
    
$
47,987
    
$
(294,750
)
  
$
139,570
  
Undistributed earnings allocated to restricted shares
    
(57
)
    
(128
)
    
—
      
(369
)
Income (loss) available to Kirby common stockholders – basic
    
27,432
      
47,859
      
(294,750
)
    
139,201
  
Undistributed earnings allocated to restricted shares
    
57
      
128
      
—
      
369
  
Undistributed earnings reallocated to restricted shares
    
(57
)
    
(128
)
    
—
      
(368
)
Income (loss) available to Kirby common stockholders – diluted
  
$
27,432
    
$
47,859
    
$
(294,750
)
  
$
139,202
  
                                 
Shares outstanding:
                                
Weighted average common stock issued and outstanding
    
60,038
      
59,908
      
60,015
      
59,891
  
Weighted average unvested restricted stock
    
(123
)
    
(159
)
    
(112
)
    
(158
)
Weighted average common stock outstanding – basic
    
59,915
      
59,749
      
59,903
      
59,733
  
Dilutive effect of stock options and restricted stock units
    
16
      
157
      
—
      
146
  
Weighted average common stock outstanding – diluted
    
59,931
      
59,906
      
59,903
      
59,879
  
                                 
Net earnings (loss) per share attributable to Kirby common stockholders:
                                
Basic
  
$
0.46
    
$
0.80
    
$
(4.92
)
  
$
2.33
  
Diluted
  
$
0.46
    
$
0.80
    
$
(4.92
)
  
$
2.32
  



Certain outstanding options to purchase approximately 681,000 and 297,000 shares of common stock were excluded in the computation of diluted earnings per share as of September 30, 2020 and 2019, respectively, as such stock options would have been antidilutive.  Certain outstanding RSUs to convert to 162,000 and 5,000 shares of common stock were also excluded in the computation of diluted earnings per share as of September 30, 2020 and 2019, respectively, as such RSUs would have been antidilutive.