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REVENUES (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 (in thousands):


  
Three months ended
June 30,
    
Six months ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Marine transportation segment:
                        
Inland transportation
  
$
310,162
    
$
286,920
    
$
593,247
    
$
539,275
  
Coastal transportation
    
94,124
      
91,243
      
179,160
      
179,291
  
   
$
404,286
    
$
378,163
    
$
772,407
    
$
718,566
  
Distribution and services segment:
                                
Oil and gas
  
$
198,864
    
$
304,859
    
$
421,965
    
$
579,350
  
Commercial and industrial
    
167,892
      
119,649
      
321,291
      
246,443
  
   
$
366,756
    
$
424,508
    
$
743,256
    
$
825,793