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v3.22.2.2

Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Inventories and supplies |  |  |
Raw materials | $ 7,675 |  | $ 5,316
Semi-finished goods | 7,051 |  | 6,708
Finished goods | 29,550 |  | 21,995
Supplies | 6,496 |  | 6,041
Reserves for excess and obsolete items | (5,523) | $ (5,496) | (5,132)
Inventories and supplies | 45,249 |  | $ 34,928
Changes in reserves for excess and obsolete items |  |  |
Balance, beginning of year | 5,132 | 11,748 |
Balance, end of period | 5,523 | 5,496 |
Reserves for excess and obsolete items |  |  |
Changes in reserves for excess and obsolete items |  |  |
Amounts charged to expense | 2,552 | 2,884 |
Write-offs and other | $ (2,161) | $ (9,136) |

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