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SEGMENT DATA (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
Segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
SEGMENT DATA [Abstract]      
Number of reportable segments | Segment 2    
Revenues [Abstract]      
Marine transportation $ 378,343,000 $ 419,905,000  
Diesel engine services 80,390,000 167,768,000  
Total revenues 458,733,000 587,673,000  
Segment profit (loss) 61,343,000 97,902,000  
Total assets 4,108,986,000   $ 4,152,281,000
Other segment disclosures [Abstract]      
Gain on disposition of assets 67,000 1,555,000  
Interest expense (4,193,000) (5,250,000)  
Other income 135,000 60,000  
Other [Member]      
Revenues [Abstract]      
Segment profit (loss) (7,646,000) (7,210,000)  
Total assets 51,475,000   63,179,000
Other segment disclosures [Abstract]      
General corporate expenses (3,655,000) (3,575,000)  
Gain on disposition of assets 67,000 1,555,000  
Interest expense (4,193,000) (5,250,000)  
Other income 135,000 60,000  
Profit (loss) from other segment (7,646,000) (7,210,000)  
Details of "Other" total assets [Abstract]      
General corporate assets 49,250,000   61,089,000
Investment in affiliates 2,225,000   2,090,000
Total other assets 51,475,000   63,179,000
Reporting Segments [Member]      
Revenues [Abstract]      
Marine transportation 378,343,000 419,905,000  
Diesel engine services 80,390,000 167,768,000  
Reporting Segments [Member] | Marine Transportation [Member]      
Revenues [Abstract]      
Segment profit (loss) 69,795,000 96,269,000  
Total assets 3,438,587,000   3,451,553,000
Reporting Segments [Member] | Diesel Engine Services [Member]      
Revenues [Abstract]      
Segment profit (loss) (806,000) 8,843,000  
Total assets 618,924,000   $ 637,549,000
Intersegment Eliminations [Member] | Marine Transportation [Member]      
Revenues [Abstract]      
Total revenues 4,384,000 7,360,000  
Segment profit (loss) $ 438,000 $ 736,000