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INVESTMENTS IN ASSOCIATED COMPANIES (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Aug. 27, 2021
River Box Holding Inc. ("River Box")          
Schedule of Equity Method Investments [Line Items]          
Participation in equity method investee (in percentage)   49.90% 49.90% 49.90%  
Financial guarantee [Member]          
Schedule of Equity Method Investments [Line Items]          
Amount guaranteed by Ship Finance         $ 83,000,000
Seadrill | Financial guarantee [Member]          
Schedule of Equity Method Investments [Line Items]          
Accounts payable         3,000,000
River Box Holding Inc. ("River Box")          
Schedule of Equity Method Investments [Line Items]          
Proceeds from dividends received   $ 1,500,000 $ 700,000 $ 2,200,000  
SFL Hercules Ltd. (“SFL Hercules”)          
Schedule of Equity Method Investments [Line Items]          
Proceeds from dividends received     $ 0 $ 0  
SFL Hercules Ltd. (“SFL Hercules”) | Financial guarantee [Member]          
Schedule of Equity Method Investments [Line Items]          
Cash contribution         $ 5,000,000
West Hercules          
Schedule of Equity Method Investments [Line Items]          
Bareboat charter revenues, per day $ 64,700        
Bareboat charter revenues, per day, after emergence date 60,000        
Bareboat charter revenues, per day, other scenarios $ 40,000