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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 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