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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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