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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Inventories and supplies |  |  |
Finished and semi-finished goods | $ 40,453 |  | $ 40,715
Raw materials and supplies | 18,508 |  | 17,952
Reserve for excess and obsolete items | (9,702) | $ (5,523) | (6,400)
Inventories and supplies, net of reserve | 49,259 |  | $ 52,267
Changes in reserve for excess and obsolete items |  |  |
Balance, beginning of year | 6,400 | 5,132 |
Balance, end of period | 9,702 | 5,523 |
Reserves for excess and obsolete items |  |  |
Changes in reserve for excess and obsolete items |  |  |
Amounts charged to expense | 3,859 | 2,552 |
Write-offs and other | $ (557) | $ (2,161) |

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