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Other assets - Summary of other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Miscellaneous non-current assets [abstract]    
Long-term value added tax and other taxes recoverable $ 74,495 $ 55,394
Prepaid forestry fees 1,403 1,403
Prepaid loan costs 3,175 1,487
Investment in marketable securities and debt securities 105,966 61,611
Other 170 170
Total other assets $ 185,209 $ 120,065