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ACQUISITIONS (Details)
$ in Thousands
May 10, 2018
USD ($)
TankBarge
bbl
Mar. 15, 2018
USD ($)
TankBarge
Feb. 14, 2018
USD ($)
TankBarge
Towboat
bbl
Feb. 12, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Assets [Abstract]            
Goodwill         $ 961,745 $ 935,135
Senior Notes Due March 01, 2028 [Member]            
Acquisitions [Abstract]            
Long term debt, face amount       $ 500,000    
Debt instrument, interest rate, stated percentage       4.20%    
Credit facility, expiration date       Mar. 01, 2028    
Higman [Member]            
Acquisitions [Abstract]            
Cash consideration     $ 421,922      
Goodwill expected to deductible for tax purposes     9,873      
Intangible assets acquired     $ 11,100      
Weighted average amortization period of intangibles     4 years 10 months 24 days      
Assets [Abstract]            
Cash     $ 2,313      
Accounts receivable     27,527      
Prepaid expenses and other current assets     5,323      
Property and equipment     497,503      
Goodwill     9,873      
Other assets     31      
Total assets     542,570      
Liabilities [Abstract]            
Accounts payable     17,012      
Accrued liabilities     14,128      
Deferred income taxes     42,392      
Other long-term liabilities     47,116      
Total liabilities     120,648      
Net assets acquired     421,922      
Acquisition related costs     $ 3,261      
Higman [Member] | Inland Tank Barges [Member]            
Acquisitions [Abstract]            
Number of maritime vessels acquired | TankBarge     163      
Number of maritime vessels under construction | TankBarge     2      
Tank barge barrel capacity | bbl     4,800,000      
Average age of property     7 years      
Higman [Member] | Inland Towboats [Member]            
Acquisitions [Abstract]            
Number of maritime vessels acquired | Towboat     75      
Average age of property     8 years      
Competitor [Member] | Inland Pressure Tank Barges [Member]            
Acquisitions [Abstract]            
Number of maritime vessels acquired | TankBarge   2        
Average age of property   5 years        
Fair value of consideration transferred   $ 10,400        
Targa [Member]            
Acquisitions [Abstract]            
Cash consideration $ 69,250          
Intangible assets acquired $ 11,000          
Weighted average amortization period of intangibles 15 years          
Assets [Abstract]            
Goodwill $ 16,116          
Targa [Member] | Inland Pressure Tank Barges [Member]            
Acquisitions [Abstract]            
Number of maritime vessels acquired | TankBarge 16          
Tank barge barrel capacity | bbl 258,000