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Other assets - Summary of other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Miscellaneous non-current assets [abstract]    
Long-term value added tax and other taxes recoverable $ 32,148 $ 13,749
Prepaid forestry fees 2,655 3,222
Prepaid loan costs 2,191 2,865
Other assets 2,568 3,107
Total other assets $ 39,562 $ 22,943