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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Maritime Equipment
Mar. 31, 2013
Maritime Equipment
Vessels, net        
Estimated useful life     25 years  
Depreciation expense     $ 34,160 $ 32,739
Estimated scrap value (in dollars per lightweight ton)     245  
Deferred revenue        
Accrual related to estimated customer claims $ 579 $ 536