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Finance income and expense
 12 Months Ended
Dec. 31, 2024
Analysis of income and expense [abstract]  
Finance income and expense Finance income and expense:
20242023
Employee future benefit plan expense$(20)$(109)
Investment income36,885 43,340 
Mark to market and foreign exchange loss on financial assets (notes 13 & 31)(14,788)(12,897)
Foreign exchange gain (loss)(3,144)821 
Government levies— (100)
Finance income and other$18,933 $31,055 
Finance expense$(2,146)$(1,105)