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ACQUISITIONS (Details) $ in Thousands | Mar. 15, 2018 USD ($) TankBarge | Feb. 14, 2018 USD ($) TankBarge Towboat bbl | Feb. 12, 2018 USD ($)
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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 |  |

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