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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2014
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE
(10)EARNINGS PER SHARE

The following table presents the components of basic and diluted earnings per share of common stock for the three months and nine months ended September 30, 2014 and 2013 (in thousands, except per share amounts):

  
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2014
  
2013
  
2014
  
2013
 
         
Net earnings attributable to Kirby  
 
$
76,717
  
$
69,123
  
$
213,955
  
$
188,794
 
Undistributed earnings allocated to restricted shares
  
(449
)
  
(504
)
  
(1,255
)
  
(1,363
)
Income available to Kirby common stockholders - basic
  
76,268
   
68,619
   
212,700
   
187,431
 
Undistributed earnings allocated to restricted shares
  
449
   
504
   
1,255
   
1,363
 
Undistributed earnings reallocated to restricted shares
  
(447
)
  
(502
)
  
(1,250
)
  
(1,358
)
Income available to Kirby common stockholders - diluted
 
$
76,270
  
$
68,621
  
$
212,705
  
$
187,436
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
57,059
   
56,789
   
56,992
   
56,738
 
Weighted average unvested restricted stock  
  
(334
)
  
(414
)
  
(334
)
  
(409
)
Weighted average common stock outstanding - basic
  
56,725
   
56,375
   
56,658
   
56,329
 
Dilutive effect of stock options  
  
194
   
197
   
200
   
191
 
Weighted average common stock outstanding - diluted
  
56,919
   
56,572
   
56,858
   
56,520
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic  
 
$
1.34
  
$
1.22
  
$
3.75
  
$
3.33
 
Diluted  
 
$
1.34
  
$
1.21
  
$
3.74
  
$
3.32
 

Certain outstanding options to purchase approximately 46,000 and 112,000 shares of common stock were excluded in the computation of diluted earnings per share as of September 30, 2014 and 2013, respectively, as such stock options would have been antidilutive.