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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2022
USD ($)
$ / item
Dec. 31, 2021
USD ($)
$ / item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Vessels, net        
Estimated useful life   25 years    
Depreciation and amortization   $ 56,231 $ 65,168 $ 72,824
Estimated scrap value (in dollars per lightweight ton) | $ / item   310    
Subsequent Event        
Vessels, net        
Estimated scrap value (in dollars per lightweight ton) | $ / item 400      
Estimated life of average scrap value of steel 15 years      
Decrease in depreciation expense $ 4,500      
Vessels        
Vessels, net        
Depreciation and amortization   $ 49,417 $ 58,008 $ 66,351