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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Inventories and supplies |  |  |
Raw materials | $ 6,736 |  | $ 5,316
Semi-finished goods | 7,004 |  | 6,708
Finished goods | 22,677 |  | 21,995
Supplies | 6,525 |  | 6,041
Reserves for excess and obsolete items | (5,437) | $ (5,456) | (5,132)
Inventories and supplies | 37,505 |  | $ 34,928
Changes in reserves for excess and obsolete items |  |  |
Balance, beginning of year | 5,132 | 11,748 |
Balance, end of period | 5,437 | 5,456 |
Reserves for excess and obsolete items |  |  |
Changes in reserves for excess and obsolete items |  |  |
Amounts charged to expense | 1,516 | 2,151 |
Write-offs and other | $ (1,211) | $ (8,443) |

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