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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Basic and Diluted Loss per Share

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

  
Three Months Ended March 31,
  
   
2021
    
2020
  
Loss attributable to Kirby common stockholders – basic and diluted
  
$
(3,375
)
  
$
(347,241
)
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
    
60,074
      
59,983
  
Weighted average unvested restricted stock
    
(58
)
    
(100
)
Weighted average common stock outstanding – basic and diluted
    
60,016
      
59,883
  
                 
Net loss per share attributable to Kirby common stockholders:
                
Basic
  
$
(0.06
)
  
$
(5.80
)
Diluted
  
$
(0.06
)
  
$
(5.80
)