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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2017
EARNINGS PER SHARE [Abstract]  
Components of Basic and Diluted 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, 2017 and 2016 (in thousands, except per share amounts):

  
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2017
  
2016
  
2017
  
2016
 
Net earnings attributable to Kirby
 
$
28,607
  
$
32,010
  
$
81,868
  
$
109,051
 
Undistributed earnings allocated to restricted shares
  
(213
)
  
(239
)
  
(599
)
  
(766
)
Income available to Kirby common stockholders - basic
  
28,394
   
31,771
   
81,269
   
108,285
 
Undistributed earnings allocated to restricted shares
  
213
   
239
   
599
   
766
 
Undistributed earnings reallocated to restricted shares
  
(213
)
  
(238
)
  
(599
)
  
(765
)
Income available to Kirby common stockholders - diluted
 
$
28,394
  
$
31,772
  
$
81,269
  
$
108,286
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
55,177
   
53,856
   
54,364
   
53,827
 
Weighted average unvested restricted stock
  
(412
)
  
(401
)
  
(398
)
  
(378
)
Weighted average common stock outstanding - basic
  
54,765
   
53,455
   
53,966
   
53,449
 
Dilutive effect of stock options
  
38
   
46
   
55
   
54
 
Weighted average common stock outstanding - diluted
  
54,803
   
53,501
   
54,021
   
53,503
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.52
  
$
0.59
  
$
1.51
  
$
2.03
 
Diluted
 
$
0.52
  
$
0.59
  
$
1.50
  
$
2.02