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INVESTMENTS IN ASSOCIATED COMPANIES (Movements) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Allowance for credit loss, beginning balance | $ 9,171 |  |
Reclassification to owned vessels within the associate | (2,030) |  |
Allowance recorded in net income of associated companies | (716) |  |
Allowance for credit loss, ending balance | 6,425 |  | $ 9,171
Equity Method Investment, Nonconsolidated Investee, Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Allowance for credit loss, beginning balance | 3,421 |  |
Reclassification to owned vessels within the associate | (1,896) |  |
Allowance recorded in net income of associated companies | (551) |  |
Allowance for credit loss, ending balance | $ 974 |  | $ 3,421
River Box |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Participation in equity method investee (in percentage) | 49.90% |  | 49.90%
River Box | Equity Method Investment, Nonconsolidated Investee, Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Allowance for credit loss, beginning balance | $ 786 |  |
Reclassification to owned vessels within the associate | 0 |  |
Allowance recorded in net income of associated companies | (381) |  |
Allowance for credit loss, ending balance | $ 405 |  | $ 786
SFL Hercules |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Participation in equity method investee (in percentage) | 100.00% | 100.00% | 100.00%
SFL Hercules | Equity Method Investment, Nonconsolidated Investee, Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Allowance for credit loss, beginning balance | $ 2,635 |  |
Reclassification to owned vessels within the associate | (1,896) |  |
Allowance recorded in net income of associated companies | (170) |  |
Allowance for credit loss, ending balance | $ 569 |  | $ 2,635

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