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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2017
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE
(11)
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, 2017 and 2016 (in thousands, except per share amounts):

  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2017
  
2016
  
2017
  
2016
 
             
Net earnings attributable to Kirby
 
$
25,778
  
$
38,942
  
$
53,261
  
$
77,041
 
Undistributed earnings allocated to restricted shares
  
(196
)
  
(284
)
  
(386
)
  
(524
)
Income available to Kirby common stockholders - basic
  
25,582
   
38,658
   
52,875
   
76,517
 
Undistributed earnings allocated to restricted shares
  
196
   
284
   
386
   
524
 
Undistributed earnings reallocated to restricted shares
  
(196
)
  
(285
)
  
(386
)
  
(524
)
Income available to Kirby common stockholders - diluted
 
$
25,582
  
$
38,657
  
$
52,875
  
$
76,517
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
53,996
   
53,844
   
53,955
   
53,813
 
Weighted average unvested restricted stock
  
(410
)
  
(393
)
  
(391
)
  
(367
)
Weighted average common stock outstanding - basic
  
53,586
   
53,451
   
53,564
   
53,446
 
Dilutive effect of stock options
  
59
   
75
   
63
   
59
 
Weighted average common stock outstanding - diluted
  
53,645
   
53,526
   
53,627
   
53,505
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.48
  
$
0.72
  
$
0.99
  
$
1.43
 
Diluted
 
$
0.48
  
$
0.72
  
$
0.99
  
$
1.43
 

Certain outstanding options to purchase approximately 478,000 and 243,000 shares of common stock were excluded in the computation of diluted earnings per share as of June 30, 2017 and 2016, respectively, as such stock options would have been antidilutive.