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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2015
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 of common stock for the three months and six months ended June 30, 2015 and 2014 (in thousands, except per share amounts):

  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2015
  
2014
  
2015
  
2014
 
         
Net earnings attributable to Kirby
 
$
58,075
  
$
74,992
  
$
119,153
  
$
137,238
 
Undistributed earnings allocated to restricted shares
  
(350
)
  
(435
)
  
(696
)
  
(806
)
Income available to Kirby common stockholders - basic
  
57,725
   
74,557
   
118,457
   
136,432
 
Undistributed earnings allocated to restricted shares
  
350
   
435
   
696
   
806
 
Undistributed earnings reallocated to restricted shares
  
(349
)
  
(434
)
  
(695
)
  
(803
)
Income available to Kirby common stockholders - diluted
 
$
57,726
  
$
74,558
  
$
118,458
  
$
136,435
 
                 
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
55,651
   
57,010
   
55,772
   
56,957
 
Weighted average unvested restricted stock
  
(336
)
  
(331
)
  
(326
)
  
(334
)
Weighted average common stock outstanding - basic
  
55,315
   
56,679
   
55,446
   
56,623
 
Dilutive effect of stock options
  
117
   
190
   
119
   
203
 
Weighted average common stock outstanding - diluted
  
55,432
   
56,869
   
55,565
   
56,826
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.04
  
$
1.32
  
$
2.14
  
$
2.41
 
Diluted
 
$
1.04
  
$
1.31
  
$
2.13
  
$
2.40