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VESSELS UNDER CAPITAL LEASES, NET (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Vessels
Dec. 31, 2010
Dec. 31, 2009
Components of vessels under capital leases, net:      
Net book value $ 501,904 $ 515,666  
Number of leased shipping vessels   3  
Depreciation and amortization expense 70,286 65,076  
Vessels under capital leases
      
Components of vessels under capital leases, net:      
Cost 600,395 599,671  
Accumulated depreciation and amortization 98,491 84,005  
Number of leased shipping vessels 3    
Depreciation and amortization expense 16,600 16,100 45,900
Drydocking costs
      
Components of vessels under capital leases, net:      
Cost 9,900 9,100  
Accumulated depreciation and amortization $ 4,900 $ 5,200