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SEGMENT DATA (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Segment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
SEGMENT DATA [Abstract]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Marine transportation $ 331,265 $ 378,303 $ 674,917 $ 756,646  
Diesel engine services 142,063 63,279 290,116 143,669  
Total revenues 473,328 441,582 965,033 900,315  
Segment profit (loss) 43,015 62,474 84,013 123,817  
Total assets 4,225,356   4,225,356   $ 4,289,895
Other segment disclosures [Abstract]          
Gain (loss) on disposition of assets (139) 94 (40) 161  
Interest expense (4,465) (4,513) (8,922) (8,706)  
Other income (expense) (1) 179 (117) 314  
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Marine transportation 331,265 378,303 674,917 756,646  
Segment profit (loss) 35,766 72,726 71,020 142,521  
Total assets 3,539,345   3,539,345   3,613,951
Reporting Segments [Member] | Diesel Engine Services [Member]          
Revenues [Abstract]          
Diesel engine services 142,063 63,279 290,116 143,669  
Segment profit (loss) 16,355 (1,968) 30,089 (2,774)  
Total assets 633,583   633,583   623,268
Intersegment Eliminations [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Total revenues 4,945 6,167 10,375 10,551  
Segment profit (loss) 494 617 1,037 1,055  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (9,106) (8,284) (17,096) (15,930)  
Total assets 52,428   52,428   52,676
Other segment disclosures [Abstract]          
General corporate expenses (4,501) (4,044) (8,017) (7,699)  
Gain (loss) on disposition of assets (139) 94 (40) 161  
Interest expense (4,465) (4,513) (8,922) (8,706)  
Other income (expense) (1) 179 (117) 314  
Loss from other segment (9,106) $ (8,284) (17,096) $ (15,930)  
Details of "Other" total assets [Abstract]          
General corporate assets 50,681   50,681   50,054
Investment in affiliates 1,747   1,747   2,622
Total other assets $ 52,428   $ 52,428   $ 52,676