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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net, Fixed assets, net (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Vessels, net      
Estimated useful life 25 years    
Estimated scrap value (in dollars per lightweight ton) | $ / item 310    
Fixed assets, net      
Depreciation, Depletion and Amortization $ 68,976 $ 71,776 $ 76,330
Deferred drydocking costs      
Amortization expense for drydocking 4,629 4,988 4,113
Due from charterers, reserve 669 246  
Accrual related to estimated customer claims $ 345 327  
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, Depletion and Amortization $ 335 274 388
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, Depletion and Amortization $ 64,012 $ 66,514 $ 71,829