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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Inventories and supplies |  |  |
Raw materials | $ 5,189 |  | $ 5,412
Semi-finished goods | 7,522 |  | 7,943
Finished goods | 20,481 |  | 33,513
Supplies | 5,531 |  | 5,010
Reserve for excess and obsolete items | (5,456) | $ (7,118) | (11,748)
Inventories and supplies | 33,267 |  | $ 40,130
Change in reserve for excess and obsolete items |  |  |
Balance, beginning of year | 11,748 | 6,600 |
Amounts charged to expense | 2,151 | 861 |
Write-offs and sales | (8,443) | (343) |
Balance, end of period | $ 5,456 | $ 7,118 |

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