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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2018
EARNINGS PER SHARE [Abstract]  
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, 2018 and 2017 (in thousands, except per share amounts):

  
Three months ended
September 30,
  
Nine months ended
September 30,
 
  
2018
  
2017
  
2018
  
2017
 
Net earnings attributable to Kirby
 
$
41,816
  
$
28,607
  
$
102,889
  
$
81,868
 
Undistributed earnings allocated to restricted shares
  
(166
)
  
(213
)
  
(438
)
  
(599
)
Income available to Kirby common stockholders - basic
  
41,650
   
28,394
   
102,451
   
81,269
 
Undistributed earnings allocated to restricted shares
  
166
   
213
   
438
   
599
 
Undistributed earnings reallocated to restricted shares
  
(165
)
  
(213
)
  
(437
)
  
(599
)
Income available to Kirby common stockholders - diluted
 
$
41,651
  
$
28,394
  
$
102,452
  
$
81,269
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
59,875
   
55,177
   
59,782
   
54,364
 
Weighted average unvested restricted stock
  
(237
)
  
(412
)
  
(255
)
  
(398
)
Weighted average common stock outstanding - basic
  
59,638
   
54,765
   
59,527
   
53,966
 
Dilutive effect of stock options and restricted stock units
  
146
   
38
   
141
   
55
 
Weighted average common stock outstanding - diluted
  
59,784
   
54,803
   
59,668
   
54,021
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.70
  
$
0.52
  
$
1.72
  
$
1.51
 
Diluted
 
$
0.70
  
$
0.52
  
$
1.72
  
$
1.50