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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes |  |  |  |
Gross transportation tax |  | $ 0 | $ 365 | $ 0
Ownership percentage held by each shareholder (as a percent) |  | 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% |  |
Taxable income |  | $ (32,940) | $ (58,725) | (217,048)
Income tax expense |  |  |  | 709
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% |  |
Vessel Management Services |  |  |  |
Income Taxes |  |  |  |
Revenues |  | $ 0 | $ 0 | 2,340
Taxable income |  |  |  | 1,502
Income tax expense |  |  |  | 709
Vessel Management Services | Intersegment Elimination |  |  |  |
Income Taxes |  |  |  |
Revenues |  |  |  | $ 0
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 |  | $ 28 | $ 0 |
Denmark | Genco Shipping A/S |  |  |  |
Income Taxes |  |  |  |
Federal tax rate (as a percent) |  | 22.00% |  |
Denmark | Genco Shipping A/S | Ohter income (expense) |  |  |  |
Income Taxes |  |  |  |
Income tax expense |  | $ 79 |  |

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