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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net and Deferred revenue (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Vessels, net      
Estimated useful life 25 years    
Estimated scrap value (in dollars per lightweight ton) | $ / item 310    
Depreciation and amortization $ 72,824 $ 68,976 $ 71,776
Deferred drydocking costs      
Amortization expense for drydocking 5,484 4,629 4,988
Due from charterers, reserve 1,064 669  
Charter hire expenses 16,179 1,534 0
Accrual related to estimated customer claims $ 577 345  
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    
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      
Vessels, net      
Depreciation and amortization $ 66,351 64,012 66,514
Detail of Fixed Assets, Excluding Vessels      
Vessels, net      
Depreciation and amortization $ 989 $ 335 $ 274