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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2019
EARNINGS PER SHARE [Abstract]  
Basic and Diluted Earnings per Share
The following table presents the components of basic and diluted earnings per share for the three months ended March 31, 2019 and 2018 (in thousands, except per share amounts):

  
Three months ended
March 31,
 
  
2019
  
2018
 
Net earnings attributable to Kirby
 
$
44,296
  
$
32,471
 
Undistributed earnings allocated to restricted shares
  
(119
)
  
(156
)
Income available to Kirby common stockholders – basic
  
44,177
   
32,315
 
Undistributed earnings allocated to restricted shares
  
119
   
156
 
Undistributed earnings reallocated to restricted shares
  
(119
)
  
(156
)
Income available to Kirby common stockholders – diluted
 
$
44,177
  
$
32,315
 
         
Shares outstanding:
        
Weighted average common stock issued and outstanding
  
59,869
   
59,678
 
Weighted average unvested restricted stock
  
(160
)
  
(286
)
Weighted average common stock outstanding – basic
  
59,709
   
59,392
 
Dilutive effect of stock options and restricted stock units
  
114
   
101
 
Weighted average common stock outstanding – diluted
  
59,823
   
59,493
 
         
Net earnings per share attributable to Kirby common stockholders:
        
Basic
 
$
0.74
  
$
0.54
 
Diluted
 
$
0.74
  
$
0.54