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VESSELS AND EQUIPMENT, NET (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property and equipment:      
Property, Plant and Equipment, Gross $ 1,043,439,000 $ 771,945,000  
Property, Plant and Equipment, Net 734,155,000 342,987,000 289,182,000
Accumulated depreciation 231,724,000 198,330,000  
Components of vessels and equipment, net:      
Property, Plant and Equipment, Net, Excluding Capital Leased Assets 811,715,000 573,615,000  
Depreciation and amortization expense 36,871,000 85,524,000 70,286,000
Vessels and equipment
      
Components of vessels and equipment, net:      
Number of owned shipping vessels 7 6  
Depreciation and amortization expense 36,900,000 70,300,000 54,300,000
Drydocking [Member]
      
Components of vessels and equipment, net:      
Cost 33,100,000 34,200,000  
Accumulated depreciation and amortization (18,900,000) (12,900,000)  
Office equipment
      
Components of vessels and equipment, net:      
Cost 1,700,000 1,800,000  
Vessels
      
Components of vessels and equipment, net:      
Amounts pledged as collateral $ 700,700,000 $ 432,900,000