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OPERATING LEASES (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Minimum contractual future revenues to be received:      
Cost $ 1,043,439,000 $ 771,945,000  
Accumulated depreciation 231,724,000 198,330,000  
Future minimum payments under non-cancellable operating leases:      
2013 374,000    
2014 381,000    
2015 381,000    
2016 381,000    
2017 256,000    
Total minimum lease payments 1,773,000    
Total rental expense for operating leases 700,000 700,000 1,000,000
Vessels leased to third parties
      
Minimum contractual future revenues to be received:      
Cost 190,400,000 620,000,000  
Accumulated depreciation 29,300,000 141,200,000  
Time charters
      
Minimum contractual future revenues to be received:      
2014 50,188,000    
2015 11,413,000    
Total $ 61,601,000