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Revenues (Tables)
 12 Months Ended
Dec. 31, 2019
Revenues [Abstract]  
Revenues by Major Source

The following table sets forth the Company’s revenues by major source for the years ended December 31, 2019, 2018 and 2017 (in thousands):


  
2019
    
2018
    
2017
  
Marine transportation segment:
                  
Inland transportation
  
$
1,220,878
    
$
1,119,820
    
$
923,916
  
Coastal transportation
    
366,204
      
363,323
      
400,190
  
   
$
1,587,082
    
$
1,483,143
    
$
1,324,106
  

Distribution and services segment:
                  
Oil and gas
  
$
659,364
    
$
1,010,410
    
$
614,128
  
Commercial and industrial
    
591,953
      
477,144
      
276,184
  
   
$
1,251,317
    
$
1,487,554
    
$
890,312