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Investment in Low Carbon Royalties - Company's share of the net income (loss) generated by the Low Carbon Royalties (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Investment in Low Carbon Royalties |  |  |  |  |
Investment at the beginning of the period |  |  | $ 8,203 | $ 8,429 | $ 8,429
Equity-accounted investment income (loss) | $ 89 | $ (61) | 54 | $ (139) | (226)
Return of capital |  |  | 346 |  |
Investment at the end of the period | $ 7,911 |  | $ 7,911 |  | $ 8,203

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