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Earnings Per Share
 12 Months Ended
Dec. 31, 2017
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 years ended December 31, 2017, 2016 and 2015 (in thousands, except per share amounts):

  
2017
  
2016
  
2015
 
Net earnings attributable to Kirby
 
$
313,187
  
$
141,406
  
$
226,684
 
Undistributed earnings allocated to restricted shares
  
(2,213
)
  
(999
)
  
(1,345
)
Income available to Kirby common stockholders — basic
  
310,974
   
140,407
   
225,339
 
Undistributed earnings allocated to restricted shares
  
2,213
   
999
   
1,345
 
Undistributed earnings reallocated to restricted shares
  
(2,211
)
  
(997
)
  
(1,343
)
Income available to Kirby common stockholders — diluted
 
$
310,976
  
$
140,409
  
$
225,341
 
             
Shares outstanding:
            
Weighted average common stock issued and outstanding
  
55,702
   
53,834
   
55,056
 
Weighted average unvested restricted stock
  
(394
)
  
(380
)
  
(327
)
Weighted average common stock outstanding — basic
  
55,308
   
53,454
   
54,729
 
Dilutive effect of stock options
  
53
   
58
   
97
 
Weighted average common stock outstanding — diluted
  
55,361
   
53,512
   
54,826
 
Net earnings per share attributable to Kirby common stockholders:
            
Basic
 
$
5.62
  
$
2.63
  
$
4.12
 
             
Diluted
 
$
5.62
  
$
2.62
  
$
4.11
 

Certain outstanding options to purchase approximately 472,000, 240,000 and 227,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2017, 2016 and 2015, respectively, as such stock options would have been antidilutive.