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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Derivative
Dec. 31, 2011
Derivative
Dec. 31, 2010
Dec. 31, 2004
Orion Tankers Pool [Abstract]        
Number of tankers withdrawn from pool 9      
Cash and Cash Equivalents [Abstract]        
Original maturities of deposits classified as cash and cash equivalents (in months) 3M      
Vessels, Net [Abstract]        
Number of types of vessel 1      
Historical and Average Spot Market Rate 15 years      
Improvements amortized over a period (in years) 25      
Impairment Of Long-Lived Assets [Abstract]        
Salvage value of the vessel $ 9.7      
Drydock [Abstract]        
Period when vessels are required to be drydocked, minimum (in months) 30M      
Period when vessels are required to be drydocked, maximum (in months) 60M      
Deferred Compensation Liability [Abstract]        
Number of individual deferred compensation agreements 2      
Segments [Abstract]        
Number of operating segment 1      
Interest Risk [Abstract]        
Number of derivatives outstanding 0 0    
Geographical Segment [Abstract]        
Total number of vessels 20 17 17 3
Ballast Tank [Member]
        
Vessels, Net [Abstract]        
Improvements amortized over a period (in years) 8