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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Inventories and supplies
Raw materials	$ 5,327		$ 5,412
Semi-finished goods	7,156		7,943
Finished goods	22,788		33,513
Supplies	5,580		5,010
Reserve for excess and obsolete items	(5,496)	$ (6,682)	(11,748)
Inventories and supplies	35,355		$ 40,130
Change in reserve for excess and obsolete items
Balance, beginning of year	11,748	6,600
Amounts charged to expense	2,884	1,270
Write-offs and sales	(9,136)	(1,188)
Balance, end of period	$ 5,496	$ 6,682

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Increase in inventory reserves due to factors including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Reductions in the reserve for inventories resulting from scrapping, donating or selling inventory.

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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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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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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