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Earnings Per Share
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Earnings Per Share
(11) Earnings Per Share

The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2016, 2015 and 2014 (in thousands, except per share amounts):

  
2016
  
2015
  
2014
 
Net earnings attributable to Kirby
 
$
141,406
  
$
226,684
  
$
282,006
 
Undistributed earnings allocated to restricted shares
  
(999
)
  
(1,345
)
  
(1,643
)
Income available to Kirby common stockholders — basic
  
140,407
   
225,339
   
280,363
 
Undistributed earnings allocated to restricted shares
  
999
   
1,345
   
1,643
 
Undistributed earnings reallocated to restricted shares
  
(997
)
  
(1,343
)
  
(1,637
)
Income available to Kirby common stockholders — diluted
 
$
140,409
  
$
225,341
  
$
280,369
 
             
Shares outstanding:
            
Weighted average common stock issued and outstanding
  
53,834
   
55,056
   
57,006
 
Weighted average unvested restricted stock
  
(380
)
  
(327
)
  
(332
)
Weighted average common stock outstanding — basic
  
53,454
   
54,729
   
56,674
 
Dilutive effect of stock options
  
58
   
97
   
193
 
Weighted average common stock outstanding — diluted
  
53,512
   
54,826
   
56,867
 
Net earnings per share attributable to Kirby common stockholders:
            
Basic
 
$
2.63
  
$
4.12
  
$
4.95
 
             
Diluted
 
$
2.62
  
$
4.11
  
$
4.93
 

Certain outstanding options to purchase approximately 240,000, 227,000 and 75,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2016, 2015 and 2014, respectively, as such stock options would have been antidilutive.