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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017 (in thousands, except per share amounts):


 
2019
    
2018
    
2017
  
Net earnings attributable to Kirby
  
$
142,347
    
$
78,452
    
$
313,187
  
Undistributed earnings allocated to restricted shares
    
(369
)
    
(324
)
    
(2,213
)
Income available to Kirby common stockholders — basic
    
141,978
      
78,128
      
310,974
  
Undistributed earnings allocated to restricted shares
    
369
      
324
      
2,213
  
Undistributed earnings reallocated to restricted shares
    
(369
)
    
(323
)
    
(2,211
)
Income available to Kirby common stockholders — diluted
  
$
141,978
    
$
78,129
    
$
310,976
  
                         
Shares outstanding:
                        
Weighted average common stock issued and outstanding
    
59,905
      
59,804
      
55,702
  
Weighted average unvested restricted stock
    
(155
)
    
(247
)
    
(394
)
Weighted average common stock outstanding — basic
    
59,750
      
59,557
      
55,308
  
Dilutive effect of stock options and restricted stock units
    
159
      
132
      
53
  
Weighted average common stock outstanding — diluted
    
59,909
      
59,689
      
55,361
  
 
Net earnings per share attributable to Kirby common stockholders:
                        
Basic
  
$
2.38
    
$
1.31
    
$
5.62
  
                         
Diluted
  
$
2.37
    
$
1.31
    
$
5.62