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Background and basis of preparation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Investments subject to significant influence
Proceeds from sale of a subsidiary	$ 0	$ 9,696
Revision of Prior Period, Error Correction, Adjustment
Investments subject to significant influence
Proceeds from sale of a subsidiary		$ 9,700
Subsidiaries | VRB Energy Inc
Investments subject to significant influence
Subsidiary, ownership percentage, parent	90.00%		90.00%
Subsidiaries | Computational Geosciences Inc
Investments subject to significant influence
Subsidiary, ownership percentage, parent	94.30%		94.30%
Subsidiaries | Cordoba Minerals Corp
Investments subject to significant influence
Subsidiary, ownership percentage, parent	59.30%		60.80%
Maaden Joint Venture
Investments subject to significant influence
Ownership percentage	50.00%
VRB China | VRB Energy Inc
Investments subject to significant influence
Ownership percentage	49.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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