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Finance income and expense
12 Months Ended
Dec. 31, 2021
Analysis of income and expense [abstract]  
Finance income and expense Finance income and expense:
20212020
Employee future benefit plan expense (note 20)$(131)$(164)
Pension administration expense(120)(110)
Investment income4,043 1,436 
Other income(300)(255)
Mark to market and foreign exchange loss on financial assets (notes 14 & 31)(9,024)— 
Foreign exchange gain (loss)(1,336)4,875 
Government levies(1,945)(1,500)
Finance income and other$(8,813)$4,282 
Finance expense$(1,294)$(1,303)