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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Vessels, net          
Estimated useful life     25 years    
Depreciation expense $ 34,557 $ 33,102 $ 68,717 $ 65,841  
Estimated scrap value (in dollars per lightweight ton)     245    
Deferred revenue          
Accrual related to estimated customer claims $ 459   $ 459   $ 536