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INVESTMENTS IN ASSOCIATED COMPANIES (Term loan and credit facility) (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021
SFL Deepwater, SFL Hercules And SFL Linus |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from dividends received | $ 0 | $ 0 |
Financial Guarantee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Amount guaranteed by Ship Finance |  | 83,100,000 | $ 83,100,000
Equity Method Investment, Nonconsolidated Investee, Other | SFL Hercules |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Long-term debt |  | 185,800,000 | 177,700,000
Equity Method Investment, Nonconsolidated Investee, Other | SFL Hercules | Financial Guarantee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Amount guaranteed by Ship Finance |  | $ 83,100,000 | $ 83,100,000

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