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SHORT-TERM AND LONG-TERM DEBT (Summary of long-term debt) (Details) $ in Thousands, kr in Millions | Jun. 30, 2021 USD ($) | Jun. 30, 2021 NOK (kr) | May 31, 2021 | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total Fixed Rate and Foreign Debt | $ 675,022 |  |  | $ 593,257 |
Total debt principal | 1,695,493 |  |  | 1,663,394 |
Less: Unamortized debt issuance costs | (13,770) |  |  | (14,325) |
Less: Current portion of long-term debt | (369,552) |  |  | (484,956) |
Long-term debt | 1,312,171 |  |  | 1,164,113 |
Common stock - Frontline Ltd |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal debt amount | 15,600 |  |  | 15,600 | $ 36,800
Long-term debt, gross | $ 15,639 |  |  | 15,639 |
5.75% senior unsecured convertible notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) | 5.75% | 5.75% |  |  |
Long-term debt, gross | $ 146,919 |  |  | 212,230 |
4.875% senior unsecured convertible notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) | 4.875% | 4.875% |  |  | 4.875%
Long-term debt, gross | $ 137,900 |  |  | 139,900 |
7.25% senior unsecured sustainability-linked bonds due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) | 7.25% | 7.25% | 7.25% |  |
Long-term debt, gross | $ 150,000 |  |  | 0 |
NOK700 million senior unsecured floating rate bonds due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal debt amount | kr |  | kr 700 |  |  |
Long-term debt, gross | 81,238 |  |  | 81,572 |
NOK700 million senior unsecured floating rate bonds due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal debt amount | kr |  | 700 |  |  |
Long-term debt, gross | 80,657 |  |  | 80,989 |
NOK600 million senior unsecured floating rate bonds due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal debt amount | kr |  | kr 600 |  |  |
Long-term debt, gross | 62,669 |  |  | 62,927 |
U.S. dollar denominated floating rate debt due through 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long term debt with floating interest rate | $ 1,020,471 |  |  | $ 1,070,137 |

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