SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived Assets (Details) $ in Thousands					3 Months Ended	9 Months Ended
	Nov. 03, 2020 USD ($)	Oct. 16, 2020 USD ($)	Sep. 25, 2020 USD ($)	Sep. 17, 2020 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2020 USD ($) item	Mar. 31, 2020 item	Feb. 24, 2020 item
Impairment of long-lived assets
Impairment of vessel assets					$ 21,896	$ 134,710
Baltic Panther
Impairment of long-lived assets
Adjusted net sales price of vessel					7,285	7,285
Impairment of vessel assets					3,711	3,711
Sale of assets	$ 7,510
Broker commission (as a percent)	3.00%
Genco Loire
Impairment of long-lived assets
Adjusted net sales price of vessel					7,497	7,497
Impairment of vessel assets					$ 3,407	$ 3,407
Sale of assets		$ 7,650
Broker commission (as a percent)		2.00%
Genco Lorraine, Baltic Cougar and Baltic Leopard
Impairment of long-lived assets
Number impaired vessel assets | item					3	3
Impairment of vessel assets					$ 7,963	$ 7,963
Baltic Jaguar
Impairment of long-lived assets
Adjusted net sales price of vessel					7,081	7,081
Impairment of vessel assets					4,138	4,138
Sale of assets			$ 7,300
Broker commission (as a percent)			3.00%
Genco Normandy
Impairment of long-lived assets
Adjusted net sales price of vessel					5,733	5,733
Impairment of vessel assets					$ 2,677	2,677
Sale of assets				$ 5,850
Broker commission (as a percent)				2.00%
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