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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Inventories and supplies |  |
Finished and semi-finished goods | $ 28,335 | $ 31,146
Raw materials and supplies | 17,191 | 16,787
Reserve for excess and obsolete items | (11,017) | (11,540)
Inventories and supplies, net of reserve | $ 34,509 | $ 36,393

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