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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Due from charterers, net      
Due from charterers, reserve $ 246 $ 283  
Accrual related to estimated customer claims $ 327 220  
Vessels, net      
Estimated useful life 25 years    
Estimated scrap value (in dollars per lightweight ton) | $ / item 310    
Fixed assets, net      
Depreciation and amortization $ 71,776 76,330 $ 79,556
Deferred drydocking costs      
Amortization expense for drydocking $ 4,988 4,113 2,877
Minimum      
Deferred drydocking costs      
Period for which vessels are required to be drydocked for major repairs and maintenance 30 months    
Maximum      
Deferred drydocking costs      
Period for which vessels are required to be drydocked for major repairs and maintenance 60 months    
Detail of Fixed Assets, Excluding Vessels      
Fixed assets, net      
Depreciation and amortization $ 274 388 284
Furniture and fixtures      
Fixed assets, net      
Useful lives 5 years    
Vessel equipment | Minimum      
Fixed assets, net      
Useful lives 2 years    
Vessel equipment | Maximum      
Fixed assets, net      
Useful lives 15 years    
Computer equipment      
Fixed assets, net      
Useful lives 3 years    
Vessels      
Fixed assets, net      
Depreciation and amortization $ 66,514 $ 71,829 $ 76,395