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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - United States Gross Transportation Tax (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 15, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |  |
Gross transportation tax |  | $ 0 | $ 0 | $ 0
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% |  |
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% | 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 |  |  |
Income tax expense |  | $ 0 | $ 0 | $ 0
Denmark | Genco Shipping A/S |  |  |  |
Income Taxes |  |  |  |
Federal tax rate (as a percent) |  | 22.00% | 22.00% | 22.00%
Denmark | Genco Shipping A/S | Other income (expense) |  |  |  |
Income Taxes |  |  |  |
Income tax expense |  | $ 407 | $ 241 | $ 79

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- Definition Represents the percentage of shipping income included in source shipping income attributable to transportation that begins or ends, but that does not both begin and end, in the domestic country of the entity. + References No definition available. + Details
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