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Other noncurrent liabilities - Summary of Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Other noncurrent liabilities    
Reserve for uncertain tax positions   $ 4,778
OPEB $ 312 451
Insurance claims and expenses 684 685
Other 281 345
Total $ 1,277 $ 6,259