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Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Results (Unaudited) [Abstract]  
Schedule of Quarterly Results
The unaudited quarterly results for the year ended December 31, 2017 were as follows (in thousands, except per share amounts):

 
 
Three Months Ended
 
  
March 31,
2017
  
June 30,
2017
  
September 30,
2017
  
December 31,
2017
 
Revenues
 
$
491,705
  
$
473,328
  
$
541,274
  
$
708,111
 
Costs and expenses
  
446,233
   
425,708
   
487,753
   
755,990
 
Gain (loss) on disposition of assets
  
99
   
(139
)
  
(159
)
  
(4,288
)
Operating income (loss)
  
45,571
   
47,481
   
53,362
   
(52,167
)
Other income (expense)
  
(116
)
  
(1
)
  
(113
)
  
469
 
Interest expense
  
(4,457
)
  
(4,465
)
  
(5,388
)
  
(7,162
)
Earnings before taxes on income
  
40,998
   
43,015
   
47,861
   
(58,860
)
Benefit (provision) for taxes on income
  
(13,353
)
  
(17,043
)
  
(19,072
)
  
290,357
 
Net earnings
  
27,645
   
25,972
   
28,789
   
231,497
 
Less: Net earnings attributable to noncontrolling interests
  
(162
)
  
(194
)
  
(182
)
  
(178
)
Net earnings attributable to Kirby
 
$
27,483
  
$
25,778
  
$
28,607
  
$
231,319
 
                 
Net earnings per share attributable to Kirby common stockholders:
                
Basic
 
$
0.51
  
$
0.48
  
$
0.52
  
$
3.88
 
Diluted
 
$
0.51
  
$
0.48
  
$
0.52
  
$
3.87
 

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