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Segment Data (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014 (in thousands):

  
2016
  
2015
  
2014
 
Revenues:
         
Marine transportation
 
$
1,471,893
  
$
1,663,090
  
$
1,770,684
 
Diesel engine services
  
298,780
   
484,442
   
795,634
 
  
$
1,770,673
  
$
2,147,532
  
$
2,566,318
 
Segment profit (loss):
            
Marine transportation
 
$
257,102
  
$
374,842
  
$
429,864
 
Diesel engine services
  
3,186
   
18,921
   
60,063
 
Other
  
(32,542
)
  
(32,051
)
  
(35,537
)
  
$
227,746
  
$
361,712
  
$
454,390
 
Total assets:
            
Marine transportation
 
$
3,622,348
  
$
3,451,553
  
$
3,317,696
 
Diesel engine services
  
628,290
   
637,549
   
736,129
 
Other
  
52,861
   
63,179
   
83,789
 
  
$
4,303,499
  
$
4,152,281
  
$
4,137,614
 
Depreciation and amortization:
            
Marine transportation
 
$
184,291
  
$
175,798
  
$
154,019
 
Diesel engine services
  
12,833
   
12,498
   
11,463
 
Other
  
3,793
   
3,944
   
3,830
 
  
$
200,917
  
$
192,240
  
$
169,312
 
Capital expenditures:
            
Marine transportation
 
$
217,423
  
$
311,862
  
$
340,315
 
Diesel engine services
  
5,915
   
28,907
   
7,486
 
Other
  
7,728
   
4,706
   
7,343
 
  
$
231,066
  
$
345,475
  
$
355,144
 
Schedule of Other Segment Reporting Information
The following table presents the details of “Other” segment profit (loss) for the years ended December 31, 2016, 2015 and 2014 (in thousands):

  
2016
  
2015
  
2014
 
General corporate expenses
 
$
(14,966
)
 
$
(14,773
)
 
$
(14,896
)
Interest expense
  
(17,690
)
  
(18,738
)
  
(21,461
)
Gain (loss) on disposition of assets
  
(127
)
  
1,672
   
781
 
Other income (expense)
  
241
   
(212
)
  
39
 
  
$
(32,542
)
 
$
(32,051
)
 
$
(35,537
)

The following table presents the details of “Other” total assets as of December 31, 2016, 2015 and 2014 (in thousands):

  
2016
  
2015
  
2014
 
General corporate assets
 
$
50,239
  
$
61,089
  
$
81,250
 
Investment in affiliates
  
2,622
   
2,090
   
2,539
 
  
$
52,861
  
$
63,179
  
$
83,789