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SEGMENT DATA (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
SEGMENT DATA [Abstract] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Revenues [Abstract] |  |  |  |  |
Revenues | $ 704,845 | $ 541,274 | $ 2,249,204 | $ 1,506,307 |
Segment profit (loss) | 57,066 | 47,861 | 144,451 | 131,874 |
Total assets | 5,854,332 |  | 5,854,332 |  | $ 5,127,427
Other segment disclosures [Abstract] |  |  |  |  |
Gain (loss) on disposition of assets | 18 | (159) | 2,358 | (199) |
Interest expense | (12,345) | (5,388) | (34,665) | (14,310) |
Other income (expense) | 1,454 | 320 | 4,586 | (41) |
Executive Chairman [Member] |  |  |  |  |
Other segment disclosures [Abstract] |  |  |  |  |
General corporate expenses |  |  | 18,057 |  |
Marine Transportation [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Revenues | 382,040 | 318,810 | 1,100,606 | 993,727 |
Distribution and Services [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Revenues | 322,805 | 222,464 | 1,148,598 | 512,580 |
Other [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Segment profit (loss) | (15,365) | (9,735) | (59,543) | (27,101) |
Total assets | 61,411 |  | 61,411 |  | 75,243
Other segment disclosures [Abstract] |  |  |  |  |
General corporate expenses | (4,492) | (4,508) | (31,822) | (12,551) |
Gain (loss) on disposition of assets | 18 | (159) | 2,358 | (199) |
Interest expense | (12,345) | (5,388) | (34,665) | (14,310) |
Other income (expense) | 1,454 | 320 | 4,586 | (41) |
Loss from other segment | (15,365) | (9,735) | (59,543) | (27,101) |
Details of "Other" total assets [Abstract] |  |  |  |  |
General corporate assets | 59,229 |  | 59,229 |  | 73,353
Investment in affiliates | 2,182 |  | 2,182 |  | 1,890
Total other assets | 61,411 |  | 61,411 |  | 75,243
Reporting Segments [Member] | Marine Transportation [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Revenues | 382,040 | 318,810 | 1,100,606 | 993,727 |
Segment profit (loss) | 48,517 | 35,649 | 102,925 | 106,992 |
Total assets | 4,191,514 |  | 4,191,514 |  | 3,485,099
Reporting Segments [Member] | Distribution and Services [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Revenues | 322,805 | 222,464 | 1,148,598 | 512,580 |
Segment profit (loss) | 23,914 | 21,947 | 101,069 | 51,983 |
Total assets | 1,601,407 |  | 1,601,407 |  | $ 1,567,085
Intersegment Eliminations [Member] |  |  |  |  |
Revenues [Abstract] |  |  |  |  |
Revenues | 5,837 | 4,967 | 21,757 | 15,342 |
Segment profit (loss) | $ 584 | $ 497 | $ 2,176 | $ 1,534 |

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