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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
The following table presents the components of basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012 (in thousands, except per share amounts):

  
2014
  
2013
  
2012
 
Net earnings attributable to Kirby
 
$
282,006
  
$
253,061
  
$
209,438
 
Undistributed earnings allocated to restricted shares
  
(1,643
)
  
(1,819
)
  
(1,618
)
Income available to Kirby common stockholders — basic
  
280,363
   
251,242
   
207,820
 
Undistributed earnings allocated to restricted shares
  
1,643
   
1,819
   
1,618
 
Undistributed earnings reallocated to restricted shares
  
(1,637
)
  
(1,813
)
  
(1,612
)
Income available to Kirby common stockholders — diluted
 
$
280,369
  
$
251,248
  
$
207,826
 
             
Shares outstanding:
            
Weighted average common stock issued and outstanding
  
57,006
   
56,762
   
55,897
 
Weighted average unvested restricted stock
  
(332
)
  
(408
)
  
(431
)
Weighted average common stock outstanding — basic
  
56,674
   
56,354
   
55,466
 
Dilutive effect of stock options
  
193
   
198
   
208
 
Weighted average common stock outstanding — diluted
  
56,867
   
56,552
   
55,674
 
Net earnings per share attributable to Kirby common stockholders:
            
Basic
 
$
4.95
  
$
4.46
  
$
3.75
 
             
Diluted
 
$
4.93
  
$
4.44
  
$
3.73