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Segment Data (Tables)
12 Months Ended
Dec. 31, 2014
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, 2014, 2013 and 2012 (in thousands):

  
2014
  
2013
  
2012
 
Revenues:
      
Marine transportation
 
$
1,770,684
  
$
1,713,167
  
$
1,408,893
 
Diesel engine services
  
795,634
   
529,028
   
703,765
 
  
$
2,566,318
  
$
2,242,195
  
$
2,112,658
 
Segment profit (loss):
            
Marine transportation
 
$
429,864
  
$
408,255
  
$
311,755
 
Diesel engine services
  
60,063
   
42,767
   
66,386
 
Other
  
(35,537
)
  
(42,344
)
  
(37,615
)
  
$
454,390
  
$
408,678
  
$
340,526
 
Total assets:
            
Marine transportation
 
$
3,317,696
  
$
3,046,692
  
$
2,951,723
 
Diesel engine services
  
736,129
   
576,472
   
647,986
 
Other
  
88,084
   
59,353
   
53,419
 
  
$
4,141,909
  
$
3,682,517
  
$
3,653,128
 
Depreciation and amortization:
            
Marine transportation
 
$
154,019
  
$
149,574
  
$
129,857
 
Diesel engine services
  
11,463
   
11,096
   
12,030
 
Other
  
3,830
   
3,767
   
3,260
 
  
$
169,312
  
$
164,437
  
$
145,147
 
Capital expenditures:
            
Marine transportation
 
$
340,315
  
$
237,964
  
$
274,351
 
Diesel engine services
  
7,486
   
4,658
   
20,477
 
Other
  
7,343
   
10,605
   
17,339
 
  
$
355,144
  
$
253,227
  
$
312,167
 
Schedule of Other Segment Reporting Information
The following table presents the details of “Other” segment profit (loss) for the years ended December 31, 2014, 2013 and 2012 (in thousands):

  
2014
  
2013
  
2012
 
General corporate expenses
 
$
(14,896
)
 
$
(15,728
)
 
$
(13,294
)
Interest expense
  
(21,461
)
  
(27,872
)
  
(24,385
)
Gain (loss) on disposition of assets
  
781
   
888
   
(14
)
Other income
  
39
   
368
   
78
 
  
$
(35,537
)
 
$
(42,344
)
 
$
(37,615
)

The following table presents the details of “Other” total assets as of December 31, 2014, 2013 and 2012 (in thousands):

  
2014
  
2013
  
2012
 
General corporate assets
 
$
85,545
  
$
57,197
  
$
51,611
 
Investment in affiliates
  
2,539
   
2,156
   
1,808
 
  
$
88,084
  
$
59,353
  
$
53,419