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SEGMENT DATA (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Segment
Jun. 30, 2013
Dec. 31, 2013
SEGMENT DATA [Abstract]          
Number of Reportable Segments     2    
Revenues [Abstract]          
Marine transportation $ 456,745 $ 423,868 $ 892,516 $ 842,386  
Diesel engine services 171,309 140,040 324,784 280,307  
Total revenues 628,054 563,908 1,217,300 1,122,693  
Segment profit (loss) 121,679 102,134 222,679 194,070  
Total assets 3,867,880   3,867,880   3,682,517
Other segment disclosures [Abstract]          
General corporate expenses     (7,327) (7,174)  
Gain (loss) on disposition of assets 527 537 578 505  
Interest expense (5,469) (7,219) (11,087) (15,207)  
Other income (expense) 123 101 (113) 176  
Profit (loss) from other segment     (17,949) (21,700)  
Details of "Other" total assets [Abstract]          
Total assets 3,867,880   3,867,880   3,682,517
Marine transportation [Member]
          
Revenues [Abstract]          
Segment profit (loss) 115,968 97,563 213,519 186,816  
Total assets 3,205,275   3,205,275   3,046,692
Details of "Other" total assets [Abstract]          
Total assets 3,205,275   3,205,275   3,046,692
Diesel engine services [Member]
          
Revenues [Abstract]          
Segment profit (loss) 14,337 14,932 27,109 28,954  
Total assets 604,730   604,730   576,472
Details of "Other" total assets [Abstract]          
Total assets 604,730   604,730   576,472
Other [Member]
          
Revenues [Abstract]          
Segment profit (loss) (8,626) (10,361) (17,949) (21,700)  
Total assets 57,875   57,875   59,353
Other segment disclosures [Abstract]          
General corporate expenses (3,807) (3,780)      
Gain (loss) on disposition of assets 527 537      
Interest expense (5,469) (7,219)      
Other income (expense) 123 101      
Profit (loss) from other segment (8,626) (10,361)      
Details of "Other" total assets [Abstract]          
General corporate assets 55,537   55,537   57,197
Investment in affiliates 2,338   2,338   2,156
Total assets $ 57,875   $ 57,875   $ 59,353