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REVENUES (Tables)
 6 Months Ended
Jun. 30, 2018
REVENUES [Abstract]  
Revenues by Major Source
The following table sets forth the Company’s revenues by major source for the three months and six months ended June 30, 2018 and 2017 (in thousands):

  
Three months ended
June 30,
  
Six months ended
June 30,
 
  
2018
  
2017
  
2018
  
2017
 
Marine transportation segment:
            
Inland transportation
 
$
286,920
  
$
224,464
  
$
539,275
  
$
461,702
 
Coastal transportation
  
91,243
   
106,801
   
179,291
   
213,215
 
  
$
378,163
  
$
331,265
  
$
718,566
  
$
674,917
 
Distribution and services segment:
                
Oil and gas
 
$
304,859
  
$
93,699
  
$
579,350
  
$
190,803
 
Commercial and industrial
  
119,649
   
48,364
   
246,443
   
99,313
 
  
$
424,508
  
$
142,063
  
$
825,793
  
$
290,116