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SEGMENT DATA (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
SEGMENT DATA [Abstract]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Revenues $ 802,671 $ 473,328 $ 1,544,359 $ 965,033  
Segment profit (loss) 44,854 43,015 87,385 84,013  
Total assets 5,829,276   5,829,276   $ 5,127,427
Other segment disclosures [Abstract]          
Gain (loss) on disposition of assets 442 (139) 2,340 (40)  
Interest expense (12,540) (4,465) (22,320) (8,922)  
Other income (expense) 1,541 228 3,132 (361)  
Executive Chairman [Member]          
Other segment disclosures [Abstract]          
General corporate expenses 18,057   18,057    
Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 378,163 331,265 718,566 674,917  
Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 424,508 142,063 825,793 290,116  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (33,564) (8,891) (44,178) (17,366)  
Total assets 62,537   62,537   75,243
Other segment disclosures [Abstract]          
General corporate expenses (23,007) (4,515) (27,330) (8,043)  
Gain (loss) on disposition of assets 442 (139) 2,340 (40)  
Interest expense (12,540) (4,465) (22,320) (8,922)  
Other income (expense) 1,541 228 3,132 (361)  
Loss from other segment (33,564) (8,891) (44,178) (17,366)  
Details of "Other" total assets [Abstract]          
General corporate assets 60,406   60,406   73,353
Investment in affiliates 2,131   2,131   1,890
Total other assets 62,537   62,537   75,243
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Revenues 378,163 331,265 718,566 674,917  
Segment profit (loss) 38,228 35,575 54,408 71,343  
Total assets 4,173,730   4,173,730   3,485,099
Reporting Segments [Member] | Distribution and Services [Member]          
Revenues [Abstract]          
Revenues 424,508 142,063 825,793 290,116  
Segment profit (loss) 40,190 16,331 77,155 30,036  
Total assets 1,593,009   1,593,009   $ 1,567,085
Intersegment Eliminations [Member]          
Revenues [Abstract]          
Revenues 7,770 4,945 15,920 10,375  
Segment profit (loss) $ 777 $ 494 $ 1,592 $ 1,037