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ACQUISITIONS (Details)
$ in Thousands
Mar. 15, 2018
USD ($)
TankBarge
Feb. 14, 2018
USD ($)
TankBarge
Towboat
bbl
Feb. 12, 2018
USD ($)
Senior Notes Due March 01, 2028 [Member]      
Business Acquisition [Line Items]      
Long term debt, face amount     $ 500,000
Debt instrument, interest rate, stated percentage     4.20%
Credit facility, expiration date     Mar. 01, 2028
Higman [Member]      
Assets [Abstract]      
Cash   $ 2,313  
Accounts receivable   20,381  
Prepaid expenses and other current assets   5,323  
Property and equipment   496,114  
Other assets   30  
Total assets   524,161  
Liabilities [Abstract]      
Accounts payable   19,666  
Accrued liabilities   3,498  
Deferred income taxes   43,059  
Other long-term liabilities   36,016  
Total liabilities   102,239  
Net assets acquired   421,922  
Acquisition related costs   $ 3,261  
Higman [Member] | Inland Tank Barges [Member]      
Business Acquisition [Line Items]      
Number of maritime vessels acquired | TankBarge   163  
Number of maritime vessels under construction | TankBarge   2  
Tank barge barrel capacity | bbl   4,800,000  
Higman [Member] | Inland Towboats [Member]      
Business Acquisition [Line Items]      
Number of maritime vessels acquired | Towboat   75  
Competitor [Member] | Inland Pressure Tank Barges [Member]      
Business Acquisition [Line Items]      
Number of maritime vessels acquired | TankBarge 2    
Average age of property 5 years    
Fair value of consideration transferred $ 10,400