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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share

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

   
Year Ended December 31,
  
 
2020
    
2019
    
2018
  
Net earnings (loss) attributable to Kirby
  
$
(272,546
)
  
$
142,347
    
$
78,452
  
Undistributed earnings allocated to restricted shares
    
—
      
(369
)
    
(324
)
Income (loss) available to Kirby common stockholders — basic
    
(272,546
)
    
141,978
      
78,128
  
Undistributed earnings allocated to restricted shares
    
—
      
369
      
324
  
Undistributed earnings reallocated to restricted shares
    
—
      
(369
)
    
(323
)
Income (loss) available to Kirby common stockholders — diluted
  
$
(272,546
)
  
$
141,978
    
$
78,129
  
                         
Shares outstanding:
                        
Weighted average common stock issued and outstanding
    
60,021
      
59,905
      
59,804
  
Weighted average unvested restricted stock
    
(109
)
    
(155
)
    
(247
)
Weighted average common stock outstanding — basic
    
59,912
      
59,750
      
59,557
  
Dilutive effect of stock options and restricted stock units
    
—
      
159
      
132
  
Weighted average common stock outstanding — diluted
    
59,912
      
59,909
      
59,689
  
                         
Net earnings (loss) per share attributable to Kirby common stockholders:
                        
Basic
  
$
(4.55
)
  
$
2.38
    
$
1.31
  
Diluted
  
$
(4.55
)
  
$
2.37
    
$
1.31