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