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EARNINGS PER SHARE
 6 Months Ended
Jun. 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 six months ended June 30, 2016 and 2015 (in thousands, except per share amounts):

 
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2016
  
2015
  
2016
  
2015
 
             
Net earnings attributable to Kirby
 
$
38,942
  
$
58,075
  
$
77,041
  
$
119,153
 
Undistributed earnings allocated to restricted shares
  
(284
)
  
(350
)
  
(524
)
  
(696
)
Income available to Kirby common stockholders - basic
  
38,658
   
57,725
   
76,517
   
118,457
 
Undistributed earnings allocated to restricted shares
  
284
   
350
   
524
   
696
 
Undistributed earnings reallocated to restricted shares
  
(285
)
  
(349
)
  
(524
)
  
(695
)
Income available to Kirby common stockholders - diluted
 
$
38,657
  
$
57,726
  
$
76,517
  
$
118,458
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
53,844
   
55,651
   
53,813
   
55,772
 
Weighted average unvested restricted stock
  
(393
)
  
(336
)
  
(367
)
  
(326
)
Weighted average common stock outstanding - basic
  
53,451
   
55,315
   
53,446
   
55,446
 
Dilutive effect of stock options
  
75
   
117
   
59
   
119
 
Weighted average common stock outstanding - diluted
  
53,526
   
55,432
   
53,505
   
55,565
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.72
  
$
1.04
  
$
1.43
  
$
2.14
 
Diluted
 
$
0.72
  
$
1.04
  
$
1.43
  
$
2.13
 

Certain outstanding options to purchase approximately 243,000 and 185,000 shares of common stock were excluded in the computation of diluted earnings per share as of June 30, 2016 and 2015, respectively, as such stock options would have been antidilutive.