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INVESTMENTS IN ASSOCIATED COMPANIES (Income statement information) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Operating revenues $ 305,686 $ 225,890  
Equity method investment, nonconsolidated investee, other      
Schedule of Equity Method Investments [Line Items]      
Operating revenues 9,665 20,141  
Net operating revenues 9,654 15,082  
Net income 1,405 2,564  
River Box Holding Inc. ("River Box")      
Schedule of Equity Method Investments [Line Items]      
Operating revenues 9,665 10,076  
Net operating revenues 9,654 10,065  
Net income $ 1,405 1,819  
SFL Hercules Ltd. (“SFL Hercules”)      
Schedule of Equity Method Investments [Line Items]      
Operating revenues   10,065  
Net operating revenues   5,017  
Net income   $ 745  
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%
SFL Hercules Ltd. (“SFL Hercules”)      
Schedule of Equity Method Investments [Line Items]      
Participation in equity method investee (in percentage)   100.00%