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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020
Inventories and supplies
Raw materials			$ 5,415	$ 5,412
Semi-finished goods			7,916	7,943
Finished goods			31,464	33,513
Supplies			5,263	5,010
Reserve for excess and obsolete items	$ (12,939)	$ (6,353)	(12,939)	(11,748)
Inventories and supplies			$ 37,119	$ 40,130
Change in reserve for excess and obsolete items
Balance, beginning of year	11,748	6,600
Amounts charged to expense	2,013	88
Write-offs	(822)	(335)
Balance, end of period	$ 12,939	$ 6,353

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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 or donating 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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