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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 07, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Feb. 27, 2018 item
Impairment of long-lived assets
Impairment of vessel assets			$ 184	$ 3,339	$ 56,586	$ 3,339
Genco Surprise
Impairment of long-lived assets
Impairment of vessel assets			$ 184	$ 3,339	184	$ 3,339
Genco Cavalier, Genco Loire, Genco Lorraine, Genco Muse, Genco Normandy, Baltic Cougar, Baltic Jaguar, Baltic Leopard and Baltic Panther
Impairment of long-lived assets
Impairment of vessel assets					$ 56,402
Number impaired vessel assets | item							9
Subsequent Event | Genco Surprise
Impairment of long-lived assets
Sale of assets	$ 5,300
Broker Commission	3.00%
Forecast | Subsequent Event | Genco Surprise
Impairment of long-lived assets
Net proceeds from sale of assets		$ 5,141

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Number of vessels determined to be impaired.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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