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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net and Deferred revenue (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
$ / item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 17, 2020
item
Summary of Significant Accounting Policies        
Due from charterers, reserve $ 669 $ 1,064    
Accrual related to estimated customer claims 358 577    
Charter hire expenses $ 10,307 16,179 $ 1,534  
Vessels, net        
Estimated useful life 25 years      
Estimated scrap value (in dollars per lightweight ton) | $ / item 310      
Depreciation and amortization $ 65,168 72,824 68,976  
Number of vessels held for exchange | item 5      
Vessels held for exchange $ 38,214      
Contract Liability 7,200      
Deferred drydocking costs        
Amortization expense for drydocking $ 5,598 5,484 4,629  
Agreement To Exchange Vessels | Handysize Vessels        
Vessels, net        
Number of vessels to be exchanged | item       6
Number of vessels exchanged | item 1      
Agreement To Exchange Vessels | Ultramax Vessels        
Vessels, net        
Contract Liability $ 7,200      
Number of vessels to be exchanged | item       3
Number of vessels exchanged | item 1      
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      
Vessels        
Vessels, net        
Depreciation and amortization $ 58,008 66,351 64,012  
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      
Detail of Fixed Assets, Excluding Vessels        
Vessels, net        
Depreciation and amortization $ 1,562 $ 989 $ 335