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Quarterly Results (Unaudited)
 12 Months Ended
Dec. 31, 2015
Quarterly Results (Unaudited) [Abstract]  
Quarterly Results (Unaudited)
(11) Quarterly Results (Unaudited)

The unaudited quarterly results for the year ended December 31, 2015 were as follows (in thousands, except per share amounts):

  
Three Months Ended
 
  
March 31,
2015
  
June 30,
2015
  
September 30,
2015
  
December 31,
2015
 
Revenues
 
$
587,673
  
$
543,156
  
$
532,565
  
$
484,138
 
Costs and expenses
  
486,136
   
445,113
   
437,115
   
400,178
 
Gain (loss) on disposition of assets
  
1,555
   
91
   
(400
)
  
426
 
Operating income
  
103,092
   
98,134
   
95,050
   
84,386
 
Other income (expense)
  
60
   
(303
)
  
22
   
9
 
Interest expense
  
(5,250
)
  
(4,759
)
  
(4,449
)
  
(4,280
)
Earnings before taxes on income
  
97,902
   
93,072
   
90,623
   
80,115
 
Provision for taxes on income
  
(36,491
)
  
(34,696
)
  
(33,512
)
  
(29,043
)
Net earnings
  
61,411
   
58,376
   
57,111
   
51,072
 
Less: Net earnings attributable to noncontrolling interests
  
(333
)
  
(301
)
  
(268
)
  
(384
)
Net earnings attributable to Kirby
 
$
61,078
  
$
58,075
  
$
56,843
  
$
50,688
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.09
  
$
1.04
  
$
1.04
  
$
0.94
 
Diluted
 
$
1.09
  
$
1.04
  
$
1.04
  
$
0.94
 
 
The unaudited quarterly results for the year ended December 31, 2014 were as follows (in thousands, except per share amounts):

  
Three Months Ended
 
  
March 31,
2014
  
June 30,
2014
  
September 30,
2014
  
December 31,
2014
 
Revenues
 
$
589,246
  
$
628,054
  
$
680,721
  
$
668,297
 
Costs and expenses
  
482,443
   
501,556
   
552,642
   
554,646
 
Gain on disposition of assets
  
51
   
527
   
47
   
156
 
Operating income
  
106,854
   
127,025
   
128,126
   
113,807
 
Other income (expense)
  
(236
)
  
123
   
27
   
125
 
Interest expense
  
(5,618
)
  
(5,469
)
  
(5,225
)
  
(5,149
)
Earnings before taxes on income
  
101,000
   
121,679
   
122,928
   
108,783
 
Provision for taxes on income
  
(37,989
)
  
(45,768
)
  
(45,715
)
  
(40,310
)
Net earnings
  
63,011
   
75,911
   
77,213
   
68,473
 
Less: Net earnings attributable to noncontrolling interests
  
(765
)
  
(919
)
  
(496
)
  
(422
)
Net earnings attributable to Kirby
 
$
62,246
  
$
74,992
  
$
76,717
  
$
68,051
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
1.09
  
$
1.32
  
$
1.34
  
$
1.19
 
Diluted
 
$
1.09
  
$
1.31
  
$
1.34
  
$
1.19
 

Quarterly basic and diluted earnings per share may not total to the full year per share amounts, as the weighted average number of shares outstanding for each quarter fluctuates as a result of the assumed exercise of stock options.