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SHORT-TERM AND LONG-TERM DEBT (Narrative) (Details) $ in Thousands, shares in Millions, kr in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 USD ($) shares | May 31, 2021 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2020 NOK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 shares | Jun. 30, 2020 NOK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain on repurchase of debt |  |  | $ 700 | $ (1,100) |  |  |  |
Repayments of debt |  |  | 218,977 |  |  |  |  |
Restricted cash |  |  | 5,866 | 7,994 |  | $ 8,953 |  |
Drawdowns |  |  | 252,000 | 347,231 |  |  |  |
Common stock - Frontline Ltd |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 15,639 |  |  | 15,639 |  |
Number of shares repurchased in forward contract (in shares) | shares |  |  | 1.4 |  |  |  | 3.4 |
Forward contract shares, amount |  |  | $ 16,300 |  |  |  |  |
Principal debt amount |  |  | 15,600 | 36,800 |  | 15,600 |  |
Common stock - Frontline Ltd | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of shares repurchased in forward contract (in shares) | shares | 1.4 |  |  |  |  |  |  |
Forward contract shares, amount | $ 16,400 |  |  |  |  |  |  |
Secured borrowings, collateral, total repurchase price (in percentage) | 20.00% |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | kr |  |  |  |  | kr 500 |  |  |
Principal debt amount | kr |  |  |  |  |  |  |  | kr 500
Senior Unsecured Convertible Bonds due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | kr |  |  |  |  | 5 |  |  |
Principal debt amount | kr |  |  |  |  |  |  |  | 700
Senior Unsecured Convertible Bonds due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | kr |  |  |  |  | kr 60 |  |  |
Principal debt amount | kr |  |  |  |  |  |  |  | kr 600
4.875% senior unsecured convertible notes due 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 2,000 | $ 6,400 |  | 8,400 |  |
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% |  |  |  |  |
Long-term debt, gross |  |  | $ 150,000 |  |  | $ 0 |  |
7.25% Senior Unsecured Sustainability-Linked Bonds Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Drawdowns |  | $ 150,000 |  |  |  |  |  |

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