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Long-term investments - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Long-term investments $ 44,121 $ 36,866
Cespira Canada LP    
Schedule of Investments [Line Items]    
Long-term investments 23,846 25,494
Cespira Sweden AB    
Schedule of Investments [Line Items]    
Long-term investments 20,275 11,225
Other equity-accounted investees    
Schedule of Investments [Line Items]    
Long-term investments $ 0 $ 147