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Other assets (Tables)
12 Months Ended
Dec. 31, 2020
Miscellaneous non-current assets [abstract]  
Summary of other assets
December 31, 2020December 31, 2019
Long-term value added tax and other taxes recoverable$32,148 $13,749 
Prepaid forestry fees2,655 3,222 
Prepaid loan costs (Note 15(b))
2,191 2,865 
Other assets2,568 3,107 
$39,562 $22,943