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EARNINGS PER SHARE
 6 Months Ended
Jun. 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 six months ended June 30, 2014 and 2013 (in thousands, except per share amounts):

 
 
Three months ended
June 30,
  
Six months ended
June 30,
 
 
 
2014
  
2013
  
2014
  
2013
 
 
 
  
  
  
 
Net earnings attributable to Kirby
 
$
74,992
  
$
63,093
  
$
137,238
  
$
119,671
 
Undistributed earnings allocated to restricted shares
  
(435
)
  
(459
)
  
(806
)
  
(859
)
Income available to Kirby common stockholders - basic
  
74,557
   
62,634
   
136,432
   
118,812
 
Undistributed earnings allocated to restricted shares
  
435
   
459
   
806
   
859
 
Undistributed earnings reallocated to restricted shares
  
(434
)
  
(457
)
  
(803
)
  
(856
)
Income available to Kirby common stockholders - diluted
 
$
74,558
  
$
62,636
  
$
136,435
  
$
118,815
 
 
                
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
57,010
   
56,752
   
56,957
   
56,712
 
Weighted average unvested restricted stock
  
(331
)
  
(413
)
  
(334
)
  
(407
)
Weighted average common stock outstanding - basic
  
56,679
   
56,339
   
56,623
   
56,305
 
Dilutive effect of stock options
  
190
   
190
   
203
   
188
 
Weighted average common stock outstanding - diluted
  
56,869
   
56,529
   
56,826
   
56,493
 
 
                
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.32
  
$
1.11
  
$
2.41
  
$
2.11
 
Diluted
 
$
1.31
  
$
1.11
  
$
2.40
  
$
2.10
 

Certain outstanding options to purchase approximately 117,000 and 165,000 shares of common stock were excluded in the computation of diluted earnings per share as of June 30, 2014 and 2013, respectively, as such stock options would have been antidilutive.