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Earnings Per Share
 6 Months Ended
Jun. 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 June 30,
    
Six months ended June 30,
  
   
2020
    
2019
    
2020
    
2019
  
Net earnings (loss) attributable to Kirby
  
$
25,002
    
$
47,287
    
$
(322,239
)
  
$
91,583
  
Undistributed earnings allocated to restricted shares
    
(46
)
    
(122
)
    
—
      
(241
)
Income (loss) available to Kirby common stockholders – basic
    
24,956
      
47,165
      
(322,239
)
    
91,342
  
Undistributed earnings allocated to restricted shares
    
46
      
122
      
—
      
241
  
Undistributed earnings reallocated to restricted shares
    
(46
)
    
(122
)
    
—
      
(240
)
Income (loss) available to Kirby common stockholders – diluted
  
$
24,956
    
$
47,165
    
$
(322,239
)
  
$
91,343
  
                                 
Shares outstanding:
                                
Weighted average common stock issued and outstanding
    
60,023
      
59,894
      
60,003
      
59,882
  
Weighted average unvested restricted stock
    
(111
)
    
(154
)
    
(105
)
    
(157
)
Weighted average common stock outstanding – basic
    
59,912
      
59,740
      
59,898
      
59,725
  
Dilutive effect of stock options and restricted stock units
    
25
      
167
      
—
      
140
  
Weighted average common stock outstanding – diluted
    
59,937
      
59,907
      
59,898
      
59,865
  
                                 
Net earnings (loss) per share attributable to Kirby common stockholders:
                                
Basic
  
$
0.42
    
$
0.79
    
$
(5.38
)
  
$
1.53
  
Diluted
  
$
0.42
    
$
0.79
    
$
(5.38
)
  
$
1.53
  


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 June 30, 2020 and 2019, respectively, as such stock options would have been antidilutive.  Certain outstanding RSUs to convert to 162,000 and 4,000 shares of common stock were also excluded in the computation of diluted earnings per share as of June 30, 2020 and 2019, respectively, as such RSUs would have been antidilutive.