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EARNINGS PER SHARE (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013 and 2012 (in thousands, except per share amounts):

 
 
Three months ended
June 30,
  
Six months ended
June 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
 
 
  
  
  
 
Net earnings attributable to Kirby
 
$
63,093
  
$
47,551
  
$
119,671
  
$
98,495
 
Undistributed earnings allocated to restricted shares
  
(459
)
  
(375
)
  
(859
)
  
(769
)
Income available to Kirby common stockholders - basic
  
62,634
   
47,176
   
118,812
   
97,726
 
Undistributed earnings allocated to restricted shares
  
459
   
375
   
859
   
769
 
Undistributed earnings reallocated to restricted shares
  
(457
)
  
(374
)
  
(856
)
  
(765
)
Income available to Kirby common stockholders - diluted
 
$
62,636
  
$
47,177
  
$
118,815
  
$
97,730
 
 
                
Shares outstanding:
                
Weighted average common stock issued and outstanding
  
56,752
   
55,869
   
56,712
   
55,839
 
Weighted average unvested restricted stock
  
(413
)
  
(441
)
  
(407
)
  
(436
)
Weighted average common stock outstanding - basic
  
56,339
   
55,428
   
56,305
   
55,403
 
Dilutive effect of stock options
  
190
   
212
   
188
   
235
 
Weighted average common stock outstanding - diluted
  
56,529
   
55,640
   
56,493
   
55,638
 
 
                
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.11
  
$
.85
  
$
2.11
  
$
1.76
 
Diluted
 
$
1.11
  
$
.85
  
$
2.10
  
$
1.76