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VESSELS AND EQUIPMENT, NET (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Vessels
Dec. 31, 2011
Vessels
Dec. 31, 2010
Components of vessels and equipment, net:      
Net book value $ 573,615,000 $ 1,203,003,000  
Depreciation and amortization expense 85,524,000 70,286,000  
Vessels and equipment
      
Components of vessels and equipment, net:      
Cost 771,945,000 1,584,365,000  
Accumulated depreciation and amortization (198,330,000) (381,362,000)  
Number of owned shipping vessels 6 9  
Depreciation and amortization expense 70,300,000 54,300,000 52,800,000
Drydocking
      
Components of vessels and equipment, net:      
Cost 34,200,000 39,800,000  
Accumulated depreciation and amortization (12,900,000) (12,100,000)  
Office equipment
      
Components of vessels and equipment, net:      
Cost 1,800,000 1,700,000  
Vessels
      
Components of vessels and equipment, net:      
Amounts pledged as collateral $ 432,900,000 $ 1,188,000,000