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COMMON SHARE CAPITAL - Dividends on common shares (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 10, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
COMMON SHARE CAPITAL          
Dividend declared, per share $ 0.03 $ 0.03 $ 0.03    
Dividend declared, Total amount   $ 37,800,000 $ 37,700,000 $ 75,500,000  
Dividend paid, per share   $ 0.06      
Dividend paid, Total amount   $ 75,500,000   75,500,000 $ 0
Dividend declared and unpaid   $ 0   $ 0