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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

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