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SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (inventories and supplies) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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