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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Sale of Vessels (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gain on sale of vessels |  |  |
(Loss) gain on sale of vessels | $ (1,855) | $ (168) | $ 3,513
Genco Charger, Genco Thunder, Baltic Wind, Baltic Breeze, Genco Bay, Baltic Jaguar, Genco Loire, Genco Normandy and Genco Ocean [Member] |  |  |
Gain on sale of vessels |  |  |
(Loss) gain on sale of vessels | $ (1,855) |  |
Genco Challenger, Genco Champion and Genco Raptor |  |  |
Gain on sale of vessels |  |  |
(Loss) gain on sale of vessels |  | $ (168) |
Genco Progress, Genco Cavalier, Genco Explorer, Genco Muse, Genco Beauty and Genco Knight |  |  |
Gain on sale of vessels |  |  |
(Loss) gain on sale of vessels |  |  | $ 3,513

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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