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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2016
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 three months and nine months ended September 30, 2016 and 2015 (in thousands, except per share amounts):

  
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2016
  
2015
  
2016
  
2015
 
             
Net earnings attributable to Kirby
 
$
32,010
  
$
56,843
  
$
109,051
  
$
175,996
 
Undistributed earnings allocated to restricted shares
  
(239
)
  
(347
)
  
(766
)
  
(1,044
)
Income available to Kirby common stockholders - basic
  
31,771
   
56,496
   
108,285
   
174,952
 
Undistributed earnings allocated to restricted shares
  
239
   
347
   
766
   
1,044
 
Undistributed earnings reallocated to restricted shares
  
(238
)
  
(347
)
  
(765
)
  
(1,042
)
Income available to Kirby common stockholders - diluted
 
$
31,772
  
$
56,496
  
$
108,286
  
$
174,954
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
53,856
   
54,721
   
53,827
   
55,414
 
Weighted average unvested restricted stock
  
(401
)
  
(335
)
  
(378
)
  
(329
)
Weighted average common stock outstanding - basic
  
53,455
   
54,386
   
53,449
   
55,085
 
Dilutive effect of stock options
  
46
   
86
   
54
   
108
 
Weighted average common stock outstanding - diluted
  
53,501
   
54,472
   
53,503
   
55,193
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.59
  
$
1.04
  
$
2.03
  
$
3.18
 
Diluted
 
$
0.59
  
$
1.04
  
$
2.02
  
$
3.17
 

Certain outstanding options to purchase approximately 520,000 and 227,000 shares of common stock were excluded in the computation of diluted earnings per share as of September 30, 2016 and 2015, respectively, as such stock options would have been antidilutive.