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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands						3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 06, 2021 USD ($)	Apr. 08, 2021 USD ($)	Dec. 17, 2020 USD ($) item	Jun. 05, 2020	Jun. 04, 2020	Jun. 30, 2021 USD ($)	Jun. 30, 2020 item	Jun. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($) item	May 18, 2021 USD ($) item	Apr. 20, 2021 USD ($) item
VESSEL ACQUISITIONS
Number of vessels sold | item							0
Deposits on vessels						$ 21,638		$ 21,638
Restricted cash, current						44,606		44,606	$ 35,492
Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Maximum borrowing capacity						495,000		495,000
Restricted cash, current						44,606		$ 44,606	$ 35,492
Period for which sales proceeds from vessels will remain as restricted cash								360 days
Collateral vessel replacement period				360 days	180 days			360 days
Number of vessels sold which served as collateral | item								10	8
Secured Debt | $133 Million Credit Facility
VESSEL ACQUISITIONS
Maximum borrowing capacity						133,000		$ 133,000
Agreement To Exchange Vessels
VESSEL ACQUISITIONS
Adjusted total fair market value of vessels			$ 46,000
Broker commission (as a percent)			1.00%
Agreement To Purchase Ultramax Newbuild Vessels
VESSEL ACQUISITIONS
Number of vessels purchased under option to be acquired per purchase agreement | item										2
Capacity of vessels | item										61,000
Purchase price per vessel										$ 29,170
Deposits on vessels						17,563		17,563
Capitalized interest associated with new building contracts						54		54
Agreement To Purchase Ultramax Vessels
VESSEL ACQUISITIONS
Capacity of vessels | item											64,000
Purchase price per vessel											$ 20,200
Deposits on vessels						$ 4,075		$ 4,075
Ultramax Vessels | Agreement To Exchange Vessels
VESSEL ACQUISITIONS
Number of vessels to be exchanged | item			3
Handysize Vessels | Agreement To Exchange Vessels
VESSEL ACQUISITIONS
Number of vessels to be exchanged | item			6
Baltic Leopard
VESSEL ACQUISITIONS
Sale of assets		$ 8,000
Broker commission (as a percent)		2.00%
Genco Lorraine | Subsequent Event
VESSEL ACQUISITIONS
Sale of assets	$ 7,950
Broker commission (as a percent)	2.50%
Genco Lorraine | Subsequent Event | Secured Debt | $495 Million Credit Facility
VESSEL ACQUISITIONS
Restricted cash, current	$ 4,144
Period for which sales proceeds from vessels will remain as restricted cash	360 days
Collateral vessel replacement period	360 days

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