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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Basic and Diluted 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