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SHARE OPTION PLAN (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercised (in shares)   129,000 6,869  
Cash payment under Option Scheme   $ 0.1    
Options, expected term 5 years      
Vesting period of options awarded to employees 3 years      
Unrecognized compensation costs related to non-vested options granted   1.6   $ 0.7
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options awarded (shares) 480,000      
Initial strike price (usd per share) $ 8.79      
Ship Finance International Limited Share Option Scheme        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Credit to additional paid-in capital   $ 0.4