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SHARE CAPITAL, ADDITIONAL PAID-IN CAPITAL AND CONTRIBUTED SURPLUS (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
May 12, 2021
Feb. 17, 2021
May 01, 2020
Dividends payable (in usd per share)       $ 0.15 $ 0.15  
Shares issued, net of issuance costs $ 83,428,000 $ 12,659,000        
Repayments of debt $ 218,977,000          
Share-based compensation arrangement by share-based payment award, options, exercises in period (in shares) 129,000 6,869        
4.875% senior unsecured convertible notes due 2023            
Senior unsecured convertible notes interest rate (in percentage) 4.875% 4.875%        
Repayments of debt $ 2,000,000.0 $ 6,400,000 $ 8,400,000      
Equity adjustment arising from reacquisition of convertible notes $ 100,000   300,000      
5.75% senior unsecured convertible notes due 2021            
Senior unsecured convertible notes interest rate (in percentage) 5.75%          
Repayments of debt $ 65,300,000 $ 0        
Equity adjustment arising from reacquisition of convertible notes 400,000          
Contributed Surplus            
Dividends, common stock $ 35,700,000   $ 109,400,000      
Dividend Reinvestment Plan (drip)            
Dividend reinvestment plan, maximum number of shares authorized (in shares)           10,000,000
At The Market and Dividend Reinvestment Plan            
Shares issued (in shares) 10,200,000   8,400,000      
Shares issued, net of issuance costs $ 85,400,000   $ 61,500,000      
Shares issued, premium $ 85,300,000   $ 61,400,000      
At the Market            
Equity distribution agreement, maximum value of shares authorized           $ 100,000,000