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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2018
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE
(12)
EARNINGS PER SHARE
 
The following table presents the components of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017 (in thousands, except per share amounts):

  
Three months ended
March 31,
 
  
2018
  
2017
 
Net earnings attributable to Kirby
 
$
32,471
  
$
27,483
 
Undistributed earnings allocated to restricted shares
  
(156
)
  
(190
)
Income available to Kirby common stockholders – basic
  
32,315
   
27,293
 
Undistributed earnings allocated to restricted shares
  
156
   
190
 
Undistributed earnings reallocated to restricted shares
  
(156
)
  
(189
)
Income available to Kirby common stockholders – diluted
 
$
32,315
  
$
27,294
 
         
Shares outstanding:
        
Weighted average common stock issued and outstanding
  
59,678
   
53,914
 
Weighted average unvested restricted stock
  
(286
)
  
(372
)
Weighted average common stock outstanding – basic
  
59,392
   
53,542
 
Dilutive effect of stock options and restricted stock units
  
101
   
67
 
Weighted average common stock outstanding – diluted
  
59,493
   
53,609
 
         
Net earnings per share attributable to Kirby common stockholders:
        
Basic
 
$
0.54
  
$
0.51
 
Diluted
 
$
0.54
  
$
0.51
 
 
Certain outstanding options to purchase approximately 467,000 and 487,000 shares of common stock were excluded in the computation of diluted earnings per share as of March 31, 2018 and 2017, respectively, as such stock options would have been antidilutive.