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RELATED PARTY TRANSACTIONS (Schedule of related party loans – associated companies) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Related Party Transaction [Line Items] |  |
Interest income - related parties, long term loans to associated companies | $ 4,063 | $ 7,064
River Box |  |
Related Party Transaction [Line Items] |  |
Loans granted | 45,000 |
Loans outstanding | 45,000 |
Interest income - related parties, long term loans to associated companies | 2,300 | 0
SFL Hercules Ltd (“SFL Hercules”) |  |
Related Party Transaction [Line Items] |  |
Loans granted | 145,000 |
Loans outstanding | 80,000 |
Interest income - related parties, long term loans to associated companies | 1,800 | 1,800
SFL Deepwater Ltd (“SFL Deepwater”) |  |
Related Party Transaction [Line Items] |  |
Interest income - related parties, long term loans to associated companies | 0 | 2,500
SFL Linus Ltd (“SFL Linus”) |  |
Related Party Transaction [Line Items] |  |
Interest income - related parties, long term loans to associated companies | $ 0 | $ 2,700

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