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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) item | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) segment $ / item | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 08, 2016 item
Segment reporting |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |  |
Vessels, net |  |  |  |  |  |  |
Estimated useful life |  |  |  | 25 years |  |  |
Depreciation and amortization | $ 18,185 |  | $ 19,686 | $ 36,358 | $ 40,025 |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item |  |  |  | 310 |  |  |
Deferred revenue |  |  |  |  |  |  |
Accrual related to estimated customer claims | 481 | $ 220 |  | $ 481 |  | $ 220 |
Number of categories of General administrative and management fees | item |  | 2 |  |  |  |  |
Voyage expense recognition |  |  |  |  |  |  |
Net gain (loss) on purchase and sale of bunker fuel and LCM adjustments | 1,440 |  | (1,508) | $ 935 | (3,805) |  |
Percentage of gross shipping income attributable to transportation beginning or ending in the U.S. will be subject to a 4% tax without allowance for deductions |  |  |  | 50.00% |  |  |
Percentage of tax without allowance for deductions on gross shipping income attributable to transportation beginning or ending in the U.S |  |  |  | 4.00% |  |  |
Gross transportation tax | 61 |  |  | $ 97 |  | $ 0 |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets | 3,339 |  | 67,594 | 3,339 | 69,278 |  |
Gain on disposal of vessels |  |  |  |  |  |  |
Gain (Loss) on sale of vessels | 1,343 |  | (77) | 7,712 | (77) |  |
Other operating income |  |  |  |  |  |  |
Other operating income | 0 |  | 182 | 0 | 182 |  |
Vessels |  |  |  |  |  |  |
Vessels, net |  |  |  |  |  |  |
Depreciation and amortization | 16,892 |  | 18,541 | 33,598 | 37,675 |  |
Samsun |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |
Other operating income |  |  | 157 |  | 157 |  |
Genco Surprise |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets | 3,339 |  |  | 3,339 |  |  |
Genco Marine |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets |  |  | 0 |  | 1,684 |  |
Gain on disposal of vessels |  |  |  |  |  |  |
Gain (Loss) on sale of vessels |  |  | (77) |  | (77) |  |
Genco Prosperity Limited |  |  |  |  |  |  |
Gain on disposal of vessels |  |  |  |  |  |  |
Gain (Loss) on sale of vessels | $ 1,343 |  |  |  |  |  |
Genco Acheron, Genco Carrier, Genco Leader, Genco Pioneer, Genco Prosperity, Genco Reliance, Genco Success, Genco Sugar, Genco Wisdom |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets |  |  | $ 67,594 |  | $ 67,594 |  |
Number of vessels scrapped | item |  |  |  |  |  |  | 9
Genco Wisdom, Genco Reliance, Genco Carrier, Genco Success And Genco Prosperity |  |  |  |  |  |  |
Gain on disposal of vessels |  |  |  |  |  |  |
Gain (Loss) on sale of vessels |  |  |  | $ 7,712 |  |  |

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