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SEGMENT DATA (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Segment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
SEGMENT DATA [Abstract] |  |  |
Number of reportable segments | Segment | 2 |  |
Revenues [Abstract] |  |  |
Revenues | $ 741,688 | $ 491,705 |
Segment profit (loss) | 42,531 | 40,998 |
Total assets | 5,714,500 |  | $ 5,127,427
Other segment disclosures [Abstract] |  |  |
Gain on disposition of assets | 1,898 | 99 |
Interest expense | (9,780) | (4,457) |
Other income (expense) | 1,591 | (589) |
Marine Transportation [Member] |  |  |
Revenues [Abstract] |  |  |
Revenues | 340,403 | 343,652 |
Distribution and Services [Member] |  |  |
Revenues [Abstract] |  |  |
Revenues | 401,285 | 148,053 |
Other [Member] |  |  |
Revenues [Abstract] |  |  |
Segment profit (loss) | (10,614) | (8,475) |
Total assets | 60,560 |  | 75,243
Other segment disclosures [Abstract] |  |  |
General corporate expenses | (4,323) | (3,528) |
Gain on disposition of assets | 1,898 | 99 |
Interest expense | (9,780) | (4,457) |
Other income (expense) | 1,591 | (589) |
Loss from other segment | (10,614) | (8,475) |
Details of "Other" total assets [Abstract] |  |  |
General corporate assets | 58,535 |  | 73,353
Investment in affiliates | 2,025 |  | 1,890
Total other assets | 60,560 |  | 75,243
Reporting Segments [Member] | Marine Transportation [Member] |  |  |
Revenues [Abstract] |  |  |
Revenues | 340,403 | 343,652 |
Segment profit (loss) | 16,180 | 35,768 |
Total assets | 4,022,420 |  | 3,485,099
Reporting Segments [Member] | Distribution and Services [Member] |  |  |
Revenues [Abstract] |  |  |
Revenues | 401,285 | 148,053 |
Segment profit (loss) | 36,965 | 13,705 |
Total assets | 1,631,520 |  | $ 1,567,085
Intersegment Eliminations [Member] |  |  |
Revenues [Abstract] |  |  |
Revenues | 8,150 | 5,430 |
Segment profit (loss) | $ 815 | $ 543 |

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