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Other assets - Summary of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Miscellaneous non-current assets [abstract]    
Long-term value added tax and other taxes recoverable $ 13,749 $ 6,668
Prepaid forestry fees 3,222 3,175
Prepaid loan costs (note 16(b)) 2,865 749
Other non-current assets 3,107 0
Other assets $ 22,943 $ 10,592