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RELATED PARTY TRANSACTIONS (Schedule of amounts due from and to related parties, excluding direct financing lease balances) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amounts due from and to related parties [Abstract] |  |
Due from related parties | $ 4,842 | $ 7,718
Allowance for expected credit losses | (6,425) | (9,171)
Loans to related parties - associated companies, long-term | 125,000 | 123,910
Due to related parties | 1,329 | 2,724
River Box |  |
Amounts due from and to related parties [Abstract] |  |
Loans to related parties - associated companies, long-term | 45,000 | 45,000
SFL Hercules Ltd (“SFL Hercules”) |  |
Amounts due from and to related parties [Abstract] |  |
Loans to related parties - associated companies, long-term | 80,000 | 78,910
Frontline Shipping |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 0 | 2,875
Due to related parties | 1,204 | 836
Frontline |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 3,093 | 3,202
Seadrill |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 2,773 | 3,613
Seatankers |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 181 | 0
SFL Hercules Ltd (“SFL Hercules”) |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 213 | 0
River Box |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 5 | 0
Other related parties |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 0 | 2
Due to related parties | 50 | 39
Affiliated Entity |  |
Amounts due from and to related parties [Abstract] |  |
Allowance for expected credit losses | (2,653) | (1,974)
Frontline Management |  |
Amounts due from and to related parties [Abstract] |  |
Due to related parties | 75 | 1,826
Golden Ocean |  |
Amounts due from and to related parties [Abstract] |  |
Due from related parties | 1,230 | 0
Due to related parties | $ 0 | $ 23

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