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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Inventories and supplies
Finished and semi-finished goods	$ 27,649	$ 31,146
Raw materials and supplies	17,767	16,787
Reserve for excess and obsolete items	(11,506)	(11,540)
Inventories and supplies, net of reserve	$ 33,910	$ 36,393

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- Definition

Amount before valuation reserves of merchandise or goods held by the entity that are readily available for sale and items held by the entity which are partially complete or in the process of being readied for sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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-Topic 852
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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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Amount of valuation reserve for inventory.

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