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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived Assets (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
item
Mar. 31, 2020
USD ($)
item
Feb. 24, 2020
item
Impairment of long-lived assets      
Impairment of vessel assets | $ $ 0 $ 112,814  
Genco Picardy, Genco Predator, Genco Provence and Genco Warrior      
Impairment of long-lived assets      
Number impaired vessel assets | item   4  
Impairment of vessel assets | $   $ 27,046  
Baltic Hare, Baltic Fox, Baltic Wind, Baltic Cove, Baltic Breeze, Genco Ocean, Genco Bay, Genco Avra, Genco Mare and Genco Spirit      
Impairment of long-lived assets      
Number of vessels to be disposed | item     10
Impairment of vessel assets | $ $ 85,768    
Baltic Wind, Baltic Breeze and Genco Bay      
Impairment of long-lived assets      
Number of vessels to be disposed | item 3