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Revenues (Tables)
 12 Months Ended
Dec. 31, 2018
Revenues [Abstract]  
Revenues by Major Source
The following table sets forth the Company’s revenues by major source for the years ended December 31, 2018, 2017 and 2016 (in thousands):

  
2018
  
2017
  
2016
 
Marine transportation segment:
         
Inland transportation
 
$
1,119,820
  
$
923,916
  
$
951,097
 
Coastal transportation
  
363,323
   
400,190
   
520,796
 
  
$
1,483,143
  
$
1,324,106
  
$
1,471,893
 

Distribution and services segment:
         
Oil and gas
 
$
1,010,410
  
$
614,128
  
$
115,012
 
Commercial and industrial
  
477,144
   
276,184
   
183,768
 
  
$
1,487,554
  
$
890,312
  
$
298,780