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Quarterly Results (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Results (Unaudited) [Abstract]  
Quarterly Results (Unaudited)
(12) Quarterly Results (Unaudited)

The unaudited quarterly results for the year ended December 31, 2016 were as follows (in thousands, except per share amounts):

  
Three Months Ended
 
  
March 31,
2016
  
June 30,
2016
  
September 30,
2016
  
December 31,
2016
 
Revenues
 
$
458,733
  
$
441,582
  
$
434,708
  
$
435,650
 
Costs and expenses
  
393,399
   
374,868
   
378,400
   
378,684
 
Gain (loss) on disposition of assets
  
67
   
94
   
(122
)
  
(166
)
Operating income
  
65,401
   
66,808
   
56,186
   
56,800
 
Other income (expense)
  
135
   
179
   
(120
)
  
47
 
Interest expense
  
(4,193
)
  
(4,513
)
  
(4,507
)
  
(4,477
)
Earnings before taxes on income
  
61,343
   
62,474
   
51,559
   
52,370
 
Provision for taxes on income
  
(22,859
)
  
(23,365
)
  
(19,206
)
  
(19,512
)
Net earnings
  
38,484
   
39,109
   
32,353
   
32,858
 
Less: Net earnings attributable to noncontrolling interests
  
(385
)
  
(167
)
  
(343
)
  
(503
)
Net earnings attributable to Kirby
 
$
38,099
  
$
38,942
  
$
32,010
  
$
32,355
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.71
  
$
0.72
  
$
0.59
  
$
0.60
 
Diluted
 
$
0.71
  
$
0.72
  
$
0.59
  
$
0.60
 
 
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
 

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.