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Investments subject to significant influence (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Equity Method    
Investment $ 6,250  
Share of (loss) income (3,775) $ (4,989)
Foreign currency translation (143)  
Carried at fair value    
Change in fair value 323  
Total    
Beginning Balance 58,399  
Ending Balance 61,054  
Maaden Joint Venture    
Equity Method    
Beginning balance 8,227  
Investment 6,250  
Share of (loss) income (2,323)  
Ending balance 12,154  
VRB China    
Equity Method    
Beginning balance 47,156  
Share of (loss) income (1,485)  
Foreign currency translation (128)  
Ending balance 45,543  
Other    
Equity Method    
Beginning balance 827  
Share of (loss) income 33  
Foreign currency translation (15)  
Ending balance 845  
Sama    
Carried at fair value    
Beginning Balance 2,189  
Change in fair value 323  
Ending Balance $ 2,512