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Segment Data (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Data [Abstract]  
Schedule of Segment Reporting Information, by Segment
The following table sets forth by reportable segment the revenues, profit or loss, total assets, depreciation and amortization, and capital expenditures attributable to the principal activities of the Company for the years ended December 31, 2017, 2016 and 2015 (in thousands):

  
2017
  
2016
  
2015
 
Revenues:
         
Marine transportation
 
$
1,324,106
  
$
1,471,893
  
$
1,663,090
 
Distribution and services
  
890,312
   
298,780
   
484,442
 
  
$
2,214,418
  
$
1,770,673
  
$
2,147,532
 
Segment profit (loss):
            
Marine transportation
 
$
136,011
  
$
257,102
  
$
374,842
 
Distribution and services
  
86,585
   
3,186
   
18,921
 
Other
  
(149,582
)
  
(32,542
)
  
(32,051
)
  
$
73,014
  
$
227,746
  
$
361,712
 
Total assets:
            
Marine transportation
 
$
3,485,099
  
$
3,613,951
  
$
3,444,785
 
Distribution and services
  
1,567,085
   
623,268
   
632,764
 
Other
  
75,243
   
52,676
   
63,009
 
  
$
5,127,427
  
$
4,289,895
  
$
4,140,558
 
Depreciation and amortization:
            
Marine transportation
 
$
178,898
  
$
184,291
  
$
175,798
 
Distribution and services
  
20,387
   
12,833
   
12,498
 
Other
  
3,596
   
3,793
   
3,944
 
  
$
202,881
  
$
200,917
  
$
192,240
 
Capital expenditures:
            
Marine transportation
 
$
165,421
  
$
217,423
  
$
311,862
 
Distribution and services
  
5,086
   
5,915
   
28,907
 
Other
  
6,715
   
7,728
   
4,706
 
  
$
177,222
  
$
231,066
  
$
345,475
 
Schedule of Other Segment Reporting Information
The following table presents the details of “Other” segment profit (loss) for the years ended December 31, 2017, 2016 and 2015 (in thousands):

  
2017
  
2016
  
2015
 
General corporate expenses
 
$
(18,150
)
 
$
(14,966
)
 
$
(14,773
)
Interest expense
  
(21,472
)
  
(17,690
)
  
(18,738
)
Impairment of long-lived assets
  
(105,712
)
  
—
   
—
 
Gain (loss) on disposition of assets
  
(4,487
)
  
(127
)
  
1,672
 
Other income (expense)
  
239
   
241
   
(212
)
  
$
(149,582
)
 
$
(32,542
)
 
$
(32,051
)

The following table presents the details of “Other” total assets as of December 31, 2017, 2016 and 2015 (in thousands):

  
2017
  
2016
  
2015
 
General corporate assets
 
$
73,353
  
$
50,054
  
$
60,919
 
Investment in affiliates
  
1,890
   
2,622
   
2,090
 
  
$
75,243
  
$
52,676
  
$
63,009