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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Inventories and supplies |  |  |  |
Raw materials |  |  | $ 5,415 | $ 5,412
Semi-finished goods |  |  | 7,916 | 7,943
Finished goods |  |  | 31,464 | 33,513
Supplies |  |  | 5,263 | 5,010
Reserve for excess and obsolete items | $ (12,939) | $ (6,353) | (12,939) | (11,748)
Inventories and supplies |  |  | $ 37,119 | $ 40,130
Change in reserve for excess and obsolete items |  |  |  |
Balance, beginning of year | 11,748 | 6,600 |  |
Amounts charged to expense | 2,013 | 88 |  |
Write-offs | (822) | (335) |  |
Balance, end of period | $ 12,939 | $ 6,353 |  |

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