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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
(10) Earnings Per Share

The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2015, 2014 and 2013 (in thousands, except per share amounts):

  
2015
  
2014
  
2013
 
Net earnings attributable to Kirby
 
$
226,684
  
$
282,006
  
$
253,061
 
Undistributed earnings allocated to restricted shares
  
(1,345
)
  
(1,643
)
  
(1,819
)
Income available to Kirby common stockholders — basic
  
225,339
   
280,363
   
251,242
 
Undistributed earnings allocated to restricted shares
  
1,345
   
1,643
   
1,819
 
Undistributed earnings reallocated to restricted shares
  
(1,343
)
  
(1,637
)
  
(1,813
)
Income available to Kirby common stockholders — diluted
 
$
225,341
  
$
280,369
  
$
251,248
 
             
Shares outstanding:
            
Weighted average common stock issued and outstanding
  
55,056
   
57,006
   
56,762
 
Weighted average unvested restricted stock
  
(327
)
  
(332
)
  
(408
)
Weighted average common stock outstanding — basic
  
54,729
   
56,674
   
56,354
 
Dilutive effect of stock options
  
97
   
193
   
198
 
Weighted average common stock outstanding — diluted
  
54,826
   
56,867
   
56,552
 
Net earnings per share attributable to Kirby common stockholders:
            
Basic
 
$
4.12
  
$
4.95
  
$
4.46
 
             
Diluted
 
$
4.11
  
$
4.93
  
$
4.44
 

Certain outstanding options to purchase approximately 227,000, 75,000 and 2,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2015, 2014 and 2013, respectively, as such stock options would have been antidilutive.