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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jan. 28, 2019 USD ($) | Dec. 26, 2018 USD ($) | Dec. 17, 2018 USD ($) | Dec. 05, 2018 USD ($) | Nov. 13, 2018 USD ($) | Oct. 16, 2018 USD ($) | Sep. 13, 2018 USD ($) | Aug. 07, 2018 USD ($) | Jul. 24, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) item | Feb. 28, 2019 USD ($) | Sep. 30, 2018 USD ($) | Aug. 14, 2018 USD ($) item | Jul. 12, 2018 USD ($) item | Jun. 06, 2018 USD ($) item | Dec. 31, 2017 USD ($)
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  | $ 4,947 |  |  |  |  |  | $ 7,234
Number of vessels sold which did not serve as collateral under credit facilities | item |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of term loan facility |  |  |  |  |  |  |  |  |  | $ 495,000 | $ 495,000 | $ 495,000 |  |  |  |  |
Collateral vessel replacement period |  |  |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |  |
Secured Debt | $108 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of term loan facility |  |  |  |  |  |  |  |  |  | $ 108,000 | 108,000 |  | $ 108,000 | $ 108,000 |  |  |
Agreement To Purchase Ultramax And Capesize Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Aggregate purchase price for vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 141,000 |
Agreement To Purchase Ultramax And Capesize Vessels | Secured Debt | $108 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Agreement to Purchase Capesize Drybulk Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |
Aggregate purchase price for vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,000 |  |
Agreement to Purchase Capesize Drybulk Vessels | Secured Debt | $108 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Agreement To Purchase Ultramax Drybulk Vessels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Agreement To Purchase Ultramax Drybulk Vessels | Secured Debt | $108 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels committed to be acquired under purchase agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Genco Vigour |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets | $ 6,550 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Knight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  | $ 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Beauty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  | $ 6,560 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Muse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  | $ 6,660 |  |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Genco Cavalier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |
Genco Cavalier | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of term loan facility |  |  |  |  |  | $ 495,000 |  |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  |  |  |  |  |  | $ 4,947 |  |  |  |  |  |
Period for which sales proceeds from vessels will remain as restricted cash |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |
Collateral vessel replacement period |  |  |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |
Genco Surprise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  |  | $ 5,300 | $ 5,300 |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  |  | 3.00% | 3.00% |  |  |  |  |  |  |  |
Genco Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Genco Explorer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |  |  |
Broker commission (as a percent) |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |

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