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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Change in useful life of the vessels
Adjustment
Dec. 31, 2012
Vessels
Minimum
Dec. 31, 2012
Vessels
Maximum
Dec. 31, 2012
Machinery and equipment
Minimum
Dec. 31, 2012
Machinery and equipment
Maximum
Dec. 31, 2012
Terminal Facilities
Minimum
Dec. 31, 2012
Terminal Facilities
Maximum
Dry-docking                    
Dry-dock interval, minimum 2 years                  
Dry-dock interval, maximum 5 years                  
Depreciation                    
Useful life         10 years 40 years 2 years 20 years 3 years 35 years
Depreciation Expense $ 70.6 $ 69.4 $ 68.1 $ (1.1)