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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (inventories and supplies) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Inventories and supplies |  |  |
Raw materials | $ 5,316 | $ 5,412 |
Semi-finished goods | 6,708 | 7,943 |
Finished goods | 21,995 | 33,513 |
Supplies | 6,041 | 5,010 |
Reserve for excess and obsolete items | (5,132) | (11,748) | $ (6,600)
Inventories and supplies, net of reserves | 34,928 | 40,130 |
Changes in reserves for excess and obsolete items |  |  |
Balance, beginning of year | 11,748 | 6,600 | 5,499
Balance, end of year | 5,132 | 11,748 | 6,600
Reserve for excess and obsolete inventory [Member] |  |  |
Changes in reserves for excess and obsolete items |  |  |
Amounts charged to expense | 3,513 | 6,713 | 1,831
Write-offs and sales | $ (10,129) | $ (1,565) | $ (730)

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