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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2013
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE
(11)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, 2013 and 2012 (in thousands, except per share amounts):

 
 
Three months ended
September 30,
  
Nine months ended
September 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
 
 
  
  
  
 
Net earnings attributable to Kirby
 
$
69,123
  
$
53,055
  
$
188,794
  
$
151,550
 
Undistributed earnings allocated to restricted shares
  
(504
)
  
(409
)
  
(1,363
)
  
(1,180
)
Income available to Kirby common stockholders - basic
  
68,619
   
52,646
   
187,431
   
150,370
 
Undistributed earnings allocated to restricted shares
  
504
   
409
   
1,363
   
1,180
 
Undistributed earnings reallocated to restricted shares
  
(502
)
  
(407
)
  
(1,358
)
  
(1,175
)
Income available to Kirby common stockholders - diluted
 
$
68,621
  
$
52,648
  
$
187,436
  
$
150,375
 
 
                
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
56,789
   
55,875
   
56,738
   
55,851
 
Weighted average unvested restricted stock
  
(414
)
  
(430
)
  
(409
)
  
(435
)
Weighted average common stock outstanding - basic
  
56,375
   
55,445
   
56,329
   
55,416
 
Dilutive effect of stock options
  
197
   
182
   
191
   
218
 
Weighted average common stock outstanding - diluted
  
56,572
   
55,627
   
56,520
   
55,634
 
 
                
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.22
  
$
.95
  
$
3.33
  
$
2.71
 
Diluted
 
$
1.21
  
$
.95
  
$
3.32
  
$
2.70
 

Certain outstanding options to purchase approximately 112,000 and 156,000 shares of common stock were excluded in the computation of diluted earnings per share as of September 30, 2013 and 2012, respectively, as such stock options would have been antidilutive.