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SEGMENT DATA (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
SEGMENT DATA [Abstract]          
Number of reportable segments | Segment     2    
Revenues [Abstract]          
Marine transportation $ 378,303,000 $ 425,053,000 $ 756,646,000 $ 844,958,000  
Diesel engine services 63,279,000 118,103,000 143,669,000 285,871,000  
Total revenues 441,582,000 543,156,000 900,315,000 1,130,829,000  
Segment profit (loss) 62,474,000 93,072,000 123,817,000 190,974,000  
Total assets 4,268,815,000   4,268,815,000   $ 4,152,281,000
Other segment disclosures [Abstract]          
Gain on disposition of assets 94,000 91,000 161,000 1,646,000  
Interest expense (4,513,000) (4,759,000) (8,706,000) (10,009,000)  
Other income (expense) 179,000 (303,000) 314,000 (243,000)  
Other [Member]          
Revenues [Abstract]          
Segment profit (loss) (8,284,000) (8,870,000) (15,930,000) (16,080,000)  
Total assets 63,897,000   63,897,000   63,179,000
Other segment disclosures [Abstract]          
General corporate expenses (4,044,000) (3,899,000) (7,699,000) (7,474,000)  
Gain on disposition of assets 94,000 91,000 161,000 1,646,000  
Interest expense (4,513,000) (4,759,000) (8,706,000) (10,009,000)  
Other income (expense) 179,000 (303,000) 314,000 (243,000)  
Loss from other segment (8,284,000) (8,870,000) (15,930,000) (16,080,000)  
Details of "Other" total assets [Abstract]          
General corporate assets 61,505,000   61,505,000   61,089,000
Investment in affiliates 2,392,000   2,392,000   2,090,000
Total other assets 63,897,000   63,897,000   63,179,000
Reporting Segments [Member]          
Revenues [Abstract]          
Marine transportation 378,303,000 425,053,000      
Diesel engine services 63,279,000 118,103,000      
Reporting Segments [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Marine transportation     756,646,000 844,958,000  
Segment profit (loss) 72,726,000 97,011,000 142,521,000 193,280,000  
Total assets 3,596,923,000   3,596,923,000   3,451,553,000
Reporting Segments [Member] | Diesel Engine Services [Member]          
Revenues [Abstract]          
Diesel engine services     143,669,000 285,871,000  
Segment profit (loss) (1,968,000) 4,931,000 (2,774,000) 13,774,000  
Total assets 607,995,000   607,995,000   $ 637,549,000
Intersegment Eliminations [Member] | Marine Transportation [Member]          
Revenues [Abstract]          
Total revenues 6,167,000 5,930,000 10,551,000 13,290,000  
Segment profit (loss) $ 617,000 $ 593,000 $ 1,055,000 $ 1,329,000