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INVESTMENTS IN ASSOCIATED COMPANIES (Balance sheet information) (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]      
Current assets $ 496,757   $ 356,436
Total assets 3,193,902   3,093,211
Current liabilities 460,227   576,531
Total liabilities 2,292,582   2,297,560
Equity Method Investment, Nonconsolidated Investee, Other      
Schedule of Equity Method Investments [Line Items]      
Current assets 21,617   34,763
Non-current assets 517,381   513,918
Total assets 538,998   548,681
Current liabilities 30,618   199,255
Non-current liabilities 479,239   322,129
Total liabilities 509,857   521,384
Total stockholders’ equity $ 29,141   $ 27,297
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]      
Current assets $ 13,602   $ 12,475
Non-current assets 253,457   258,865
Total assets 267,059   271,340
Current liabilities 12,921   12,569
Non-current liabilities 237,487   243,219
Total liabilities 250,408   255,788
Total stockholders’ equity $ 16,651   $ 15,552
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]      
Current assets $ 8,015   $ 22,288
Non-current assets 263,924   255,053
Total assets 271,939   277,341
Current liabilities 17,697   186,686
Non-current liabilities 241,752   78,910
Total liabilities 259,449   265,596
Total stockholders’ equity $ 12,490   $ 11,745