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Other assets - Summary of other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Miscellaneous non-current assets [abstract]    
Long-term value added tax and other taxes recoverable $ 38,822 $ 32,148
Prepaid forestry fees 1,824 2,655
Prepaid loan costs 2,020 2,191
Investment in marketable securities and debt securities 59,849 0
Other 1,508 2,568
Total other assets $ 104,023 $ 39,562