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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 15, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |
Gross transportation tax |  | $ 0 | $ 0 | $ 365
Ownership percentage held by each shareholder (as a percent) |  | 5.00% | 5.00% | 5.00%
Federal tax rate (as a percent) |  |  | 21.00% |
Tax rate on 50% of shipping income if not qualified for Section 883 |  | 4.00% |  |
Tax on branch profits |  | 30.00% |  |
Percentage of shipping income sourced to United States if attributable to transportation exclusively between United States ports |  | 100.00% |  |
Percentage of shipping income attributable to transportation that begins or ends in the United States included in United States source shipping income |  | 50.00% |  |
Percentage of shipping income sourced to United States if no transportation is attributable to United States |  | 0.00% |  |
Minimum |  |  |  |
Income Taxes |  |  |  |
Combined ownership held by 5% shareholders (as a percent) |  | 50.00% |  |
Combined ownership of shareholders for more than half the days of year (as a percent) |  |  |  | 50.00%
Percentage of value of outstanding shares owned by the qualified shareholders of a foreign corporation |  | 50.00% |  |
Maximum |  |  |  |
Income Taxes |  |  |  |
Combined ownership of shareholders for more than half the days of year (as a percent) |  | 50.00% | 50.00% |
Singapore | Genco Shipping Pte. Ltd. (GSPL) |  |  |  |
Income Taxes |  |  |  |
Federal tax rate (as a percent) |  | 17.00% |  |
Initial period of the Maritime Sector Incentive award | 10 years |  |  |
Initial performance review period of the Maritime Sector Incentive award | 5 years |  |  |
Singapore | Genco Shipping Pte. Ltd. (GSPL) | Ohter income (expense) |  |  |  |
Income Taxes |  |  |  |
Income tax expense |  | $ 0 | $ 0 | $ 0
Denmark | Genco Shipping A/S |  |  |  |
Income Taxes |  |  |  |
Federal tax rate (as a percent) |  | 22.00% | 22.00% |
Denmark | Genco Shipping A/S | Ohter income (expense) |  |  |  |
Income Taxes |  |  |  |
Income tax expense |  | $ 241 | $ 79 |

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