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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 10, 2019 USD ($) | Aug. 02, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2020 item | Feb. 24, 2020 item
Impairment of long-lived assets |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  | $ 0 | $ 13,897 | $ 112,814 | $ 13,897 |  |
Net proceeds from sale of vessels |  |  |  |  | 14,726 | 6,309 |  |
Genco Picardy, Genco Predator, Genco Provence and Genco Warrior |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |
Number impaired vessel assets | item |  |  |  |  |  |  | 4 |
Impairment of vessel assets |  |  |  |  | 27,046 |  |  |
Baltic Hare, Baltic Fox, Baltic Wind, Baltic Cove, Baltic Breeze, Genco Ocean, Genco Bay, Genco Avra, Genco Mare and Genco Spirit |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |
Number of vessels to be disposed | item |  |  |  |  |  |  |  | 10
Impairment of vessel assets |  |  |  |  | $ 85,768 |  |  |
Baltic Wind, Baltic Breeze and Genco Bay |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |
Number of vessels to be disposed | item |  |  |  |  |  |  | 3 |
Genco Challenger |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  | 4,401 |  | 4,401 |  |
Sale of assets | $ 5,250 | $ 5,250 |  |  |  |  |  |
Broker commission (as a percent) | 2.00% | 2.00% |  |  |  |  |  |
Adjusted net sales price of vessel |  |  |  | 5,145 |  | 5,145 |  |
Genco Champion and Genco Charger |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  | $ 9,496 |  | $ 9,496 |  |

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