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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2018
EARNINGS PER SHARE [Abstract]  
EARNINGS PER SHARE
(12)
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, 2018 and 2017 (in thousands, except per share amounts):
 
  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2018
  
2017
  
2018
  
2017
 
Net earnings attributable to Kirby
 
$
28,602
  
$
25,778
  
$
61,073
  
$
53,261
 
Undistributed earnings allocated to restricted shares
  
(116
)
  
(196
)
  
(269
)
  
(386
)
Income available to Kirby common stockholders - basic
  
28,486
   
25,582
   
60,804
   
52,875
 
Undistributed earnings allocated to restricted shares
  
116
   
196
   
269
   
386
 
Undistributed earnings reallocated to restricted shares
  
(115
)
  
(196
)
  
(269
)
  
(386
)
Income available to Kirby common stockholders - diluted
 
$
28,487
  
$
25,582
  
$
60,804
  
$
52,875
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
59,790
   
53,996
   
59,735
   
53,955
 
Weighted average unvested restricted stock
  
(242
)
  
(410
)
  
(263
)
  
(391
)
Weighted average common stock outstanding - basic
  
59,548
   
53,586
   
59,472
   
53,564
 
Dilutive effect of stock options and restricted stock units
  
172
   
59
   
137
   
63
 
Weighted average common stock outstanding - diluted
  
59,720
   
53,645
   
59,609
   
53,627
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.48
  
$
0.48
  
$
1.02
  
$
0.99
 
Diluted
 
$
0.48
  
$
0.48
  
$
1.02
  
$
0.99
 

Certain outstanding options to purchase approximately 189,000 and 478,000 shares of common stock were excluded in the computation of diluted earnings per share as of June 30, 2018 and 2017, respectively, as such stock options would have been antidilutive.