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Earnings Per Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share
(13)
Earnings Per Share

The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):

  
2018
  
2017
  
2016
 
Net earnings attributable to Kirby
 
$
78,452
  
$
313,187
  
$
141,406
 
Undistributed earnings allocated to restricted shares
  
(324
)
  
(2,213
)
  
(999
)
Income available to Kirby common stockholders — basic
  
78,128
   
310,974
   
140,407
 
Undistributed earnings allocated to restricted shares
  
324
   
2,213
   
999
 
Undistributed earnings reallocated to restricted shares
  
(323
)
  
(2,211
)
  
(997
)
Income available to Kirby common stockholders — diluted
 
$
78,129
  
$
310,976
  
$
140,409
 
             
Shares outstanding:
            
Weighted average common stock issued and outstanding
  
59,804
   
55,702
   
53,834
 
Weighted average unvested restricted stock
  
(247
)
  
(394
)
  
(380
)
Weighted average common stock outstanding — basic
  
59,557
   
55,308
   
53,454
 
Dilutive effect of stock options and restricted stock units
  
132
   
53
   
58
 
Weighted average common stock outstanding — diluted
  
59,689
   
55,361
   
53,512
 
 
Net earnings per share attributable to Kirby common stockholders:
            
Basic
 
$
1.31
  
$
5.62
  
$
2.63
 
             
Diluted
 
$
1.31
  
$
5.62
  
$
2.62
 

Certain outstanding options to purchase approximately 384,000, 472,000 and 240,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2018, 2017 and 2016, respectively, as such stock options would have been antidilutive.