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VESSELS, NET (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
VESSELS, NET [Abstract]      
Number of vessels the Company believed had future undiscounted cash flow less than carrying value 1    
Schedule of Vessels [Line Items]      
Carrying Value $ 964,855 $ 1,022,793  
Accumulated depreciation 413,463 344,244  
Impairment Loss on Vessel 12,030 0 0
Depreciation expense 69,219 64,626 62,545
Vessels [Member]
      
Schedule of Vessels [Line Items]      
Carrying Value 933,424 1,005,147  
Accumulated depreciation 397,641 334,846  
Impairment Loss on Vessel 12,030    
Depreciation expense 62,795 59,102  
Drydocking [Member]
      
Schedule of Vessels [Line Items]      
Carrying Value 31,431 17,646  
Accumulated depreciation 15,822 9,398  
Impairment Loss on Vessel 0    
Depreciation expense $ 6,424 $ 5,524