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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels held for exchange (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 17, 2020
item
Vessels, net        
Number of vessels held for exchange | item   5    
Vessels held for exchange   $ 38,214    
Contract liability   7,200    
Fixed assets, net        
Depreciation and amortization $ 56,231 65,168 $ 72,824  
Deferred drydocking costs        
Amortization expense for drydocking $ 5,055 $ 5,598 5,484  
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      
Agreement To Exchange Vessels | Ultramax Vessels        
Vessels, net        
Number Of Vessels To Be Exchanged | item       3
Number of vessels exchanged | item   1    
Contract liability   $ 7,200    
Agreement To Exchange Vessels | Handysize Vessels        
Vessels, net        
Number Of Vessels To Be Exchanged | item       6
Number of vessels exchanged | item   1    
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        
Fixed assets, net        
Depreciation and amortization $ 1,759 $ 1,562 $ 989