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Other assets - Summary of other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Miscellaneous non-current assets [abstract]    
Long-term value added tax and other taxes recoverable $ 55,394 $ 38,822
Prepaid forestry fees 1,403 1,824
Prepaid loan costs 1,487 2,020
Investment in marketable securities and debt securities 61,611 59,849
Other 170 1,508
Total other assets $ 120,065 $ 104,023