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MARKETABLE SECURITIES - Narrative (Details) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions | Nov. 17, 2025 USD ($) $ / shares shares | Nov. 17, 2025 CAD ($) shares | Oct. 20, 2025 USD ($) $ / shares shares | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | --- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Available-for-sale equity securities |  |  |  | $ 120,814 | $ 6
Available-for-sale debt securities |  |  |  | 52,066 | $ 0
Bear Creek Convertible Debenture | Convertible Debt |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  | $ 49,500 |  |
Debt instrument, interest rate, stated percentage |  |  | 7.00% |  |
Debt instrument, common shares strike price (in dollars per share) | $ / shares |  |  | $ 0.73 |  |
Entree Resources Ltd. |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 50,297,717 |  |
Available-for-sale equity securities |  |  |  | 76,700 |
Equity ownership percentage |  |  | 24.00% |  |
Versamet Royalties Corporation |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 23,654,545 |  |
Equity ownership percentage |  |  | 25.00% |  |
Sale of stock, price per share (in dollars per share) | $ / shares | $ 8.75 |  |  |  |
Sale of stock, consideration received | $ 147,400 | $ 207.0 |  |  |
Equity securities, fv-ni, loss on sale | $ 48,000 |  |  |  |
Versamet Royalties Corporation | Tether |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares | 11,827,273 | 11,827,273 |  |  |
Versamet Royalties Corporation | Nemesia |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Sale of stock, number of shares issued (in shares) | shares | 11,827,272 | 11,827,272 |  |  |
Bear Creek |  |  |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |  |  |
Available-for-sale debt securities |  |  |  | $ 52,100 |

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