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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands																					3 Months Ended
	Oct. 16, 2020 USD ($)	Oct. 01, 2020 USD ($)	Sep. 25, 2020 USD ($)	Sep. 17, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jul. 07, 2020 USD ($)	Jun. 05, 2020	Jun. 04, 2020	Mar. 05, 2020 USD ($)	Feb. 24, 2020 USD ($)	Dec. 11, 2019 USD ($)	Nov. 15, 2019 USD ($)	Nov. 04, 2019 USD ($)	Oct. 21, 2019 USD ($)	Oct. 21, 2019 item	Oct. 10, 2019 USD ($)	Sep. 25, 2019 USD ($)	Sep. 20, 2019 USD ($)	Aug. 02, 2019 USD ($)	Jan. 28, 2019 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2019 item	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
VESSEL ACQUISITIONS
Number of vessels sold | item																						0
Restricted cash, current																							$ 24,227	$ 6,045
Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Collateral vessel replacement period							360 days	180 days
Baltic Jaguar
VESSEL ACQUISITIONS
Sale of assets			$ 7,300
Broker commission (as a percent)			3.00%
Baltic Jaguar | Subsequent Event
VESSEL ACQUISITIONS
Sale of assets	$ 7,300
Broker commission (as a percent)	3.00%
Baltic Jaguar | Secured Debt | Subsequent Event | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current	$ 4,054
Period for which sales proceeds from vessels will remain as restricted cash	360 days
Genco Normandy
VESSEL ACQUISITIONS
Sale of assets				$ 5,850
Broker commission (as a percent)				2.00%
Genco Normandy | Forecast
VESSEL ACQUISITIONS
Sale of assets																					$ 5,850
Broker commission (as a percent)																					2.00%
Genco Bay | Subsequent Event
VESSEL ACQUISITIONS
Sale of assets		$ 7,900
Broker commission (as a percent)		2.00%
Genco Bay | Secured Debt | Subsequent Event | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current		$ 4,798
Period for which sales proceeds from vessels will remain as restricted cash		360 days
Baltic Breeze
VESSEL ACQUISITIONS
Sale of assets					$ 7,900
Broker commission (as a percent)					2.00%
Baltic Breeze | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current					$ 4,797
Collateral vessel replacement period					360 days
Baltic Wind
VESSEL ACQUISITIONS
Sale of assets						$ 7,750
Broker commission (as a percent)						2.00%
Baltic Wind | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current						$ 4,575
Collateral vessel replacement period						360 days
Genco Thunder
VESSEL ACQUISITIONS
Sale of assets									$ 10,400								$ 10,400
Broker commission (as a percent)									2.00%								2.00%
Genco Thunder | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current									$ 5,339
Period for which sales proceeds from vessels will remain as restricted cash									360 days
Genco Charger
VESSEL ACQUISITIONS
Sale of assets										$ 5,150
Broker commission (as a percent)										1.00%
Genco Charger | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current										$ 3,471
Period for which sales proceeds from vessels will remain as restricted cash										360 days
Genco Raptor
VESSEL ACQUISITIONS
Sale of assets											$ 10,200		$ 10,200
Broker commission (as a percent)											2.00%		2.00%
Genco Raptor | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current											$ 6,045													$ 6,045
Period for which sales proceeds from vessels will remain as restricted cash											360 days
Genco Champion
VESSEL ACQUISITIONS
Sale of assets														$ 6,600				$ 6,600
Broker commission (as a percent)														3.00%				3.00%
Genco Challenger
VESSEL ACQUISITIONS
Sale of assets																$ 5,250			$ 5,250
Broker commission (as a percent)																2.00%			2.00%
Genco Champion and Genco Challenger | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Number of vessels sold | item															2
Vessel sale proceeds utilized as a loan repayment												$ 6,880
Collateral vessel replacement period												180 days
Genco Vigour
VESSEL ACQUISITIONS
Sale of assets																				$ 6,550
Broker commission (as a percent)																				2.00%

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