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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
  
   
2020
(Restated)
    
2019
  
Net earnings (loss) attributable to Kirby
  
$
(347,241
)
  
$
44,296
  
Undistributed earnings allocated to restricted shares
    
—
      
(119
)
Income (loss) available to Kirby common stockholders – basic
    
(347,241
)
    
44,177
  
Undistributed earnings allocated to restricted shares
    
—
      
119
  
Undistributed earnings reallocated to restricted shares
    
—
      
(119
)
Income (loss) available to Kirby common stockholders – diluted
  
$
(347,241
)
  
$
44,177
  
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
    
59,983
      
59,869
  
Weighted average unvested restricted stock
    
(100
)
    
(160
)
Weighted average common stock outstanding – basic
    
59,883
      
59,709
  
Dilutive effect of stock options and restricted stock units
    
—
      
114
  
Weighted average common stock outstanding – diluted
    
59,883
      
59,823
  
                 
Net earnings (loss) per share attributable to Kirby common stockholders:
                
Basic
  
$
(5.80
)
  
$
0.74
  
Diluted
  
$
(5.80
)
  
$
0.74