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SHARE CAPITAL, ADDITIONAL PAID-IN CAPITAL AND CONTRIBUTED SURPLUS - Narrative (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended | 23 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 13, 2018 | May 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | May 08, 2023 | Apr. 28, 2023 | Apr. 30, 2022 | Apr. 15, 2022 | May 31, 2020 | May 31, 2018 | May 04, 2018 | Apr. 30, 2018 | Apr. 23, 2018 | Nov. 30, 2016 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of bonds |  |  | $ 133,117,000 | $ 205,848,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital, par value (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |
Total authorized for share lending arrangement (in shares) |  |  | 11,765,142 | 11,765,842 | 11,765,842 |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |
Shares outstanding value |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares cancelled (in shares) |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares issued (in shares) |  |  | 242,146 |  | 10,786 |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) |  |  | 510,000 | 0 | 85,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 96,250,000 |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Own-share lending arrangement, shares, cancelled (in shares) |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) |  |  | 1,095,095 | 1,095,095 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average cost per share repurchased (in dollars per share) |  |  | $ 9.27 | $ 9.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock at cost |  |  | $ 10,200,000 | $ 10,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining authorized purchase amount |  |  | 90,000,000 | 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to additional paid in capital, dividends in excess of retained earnings |  |  | $ 6,900,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment Plan (DRIP) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend reinvestment plan, maximum number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
At The Market |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares issued (in shares) |  |  |  |  |  |  | 11,400,000 |  |  |  |  |  |  |  |  |  |  |
Equity distribution agreement, maximum value of shares authorized |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 90,200,000 |  |  |  |  |  |  |  |  |  |  |
At The Market and Dividend Reinvestment Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares issued (in shares) |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwritten Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total authorized for share lending arrangement (in shares) |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public offering price (in USD per share) |  |  | $ 12.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.875% |  |  |  |  |  |  |  |  |  | 4.875% |  |  |  |  |
Aggregate debt amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000.0 |  | $ 150,000,000.0 |  |
Repurchase of bonds |  |  |  | $ 53,000,000.0 |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of debt repurchased |  | $ 84,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares loaned to affiliate (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,765,842 |  |  |  |  |
Own share lending arrangement, shares transferred (in shares) |  |  | 3,765,142 | 3,765,142 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured convertible bonds due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%
Shares loaned to affiliate (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,765,842 |  |  | 8,000,000
Own share lending arrangement, shares transferred (in shares) |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Convertible Bonds Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.875% | 4.875% |  |
Equity component of convertible debt | $ 7,900,000 |  |  |  |  | $ (100,000) |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured convertible bonds due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000,000
General share lending agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares loaned to affiliate (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |

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