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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Inventories and supplies |  |  |
Raw materials | $ 5,587 |  | $ 5,316
Semi-finished goods | 6,742 |  | 6,708
Finished goods | 21,555 |  | 21,995
Supplies | 6,022 |  | 6,041
Reserves for excess and obsolete items | (5,379) | $ (12,939) | (5,132)
Inventories and supplies | 34,527 |  | $ 34,928
Change in reserves for excess and obsolete items |  |  |
Balance, beginning of year | 5,132 | 11,748 |
Amounts charged to expense | 773 | 2,013 |
Write-offs and other | (526) | (822) |
Balance, end of period | $ 5,379 | $ 12,939 |

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