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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Inventories and supplies      
Raw materials $ 11,326   $ 11,563
Semi-finished goods 5,973   7,777
Finished goods 37,240   32,938
Supplies 6,866   6,389
Reserve for excess and obsolete items (7,482) $ (5,379) (6,400)
Inventories and supplies 53,923   $ 52,267
Changes in reserve for excess and obsolete items      
Balance, beginning of year 6,400 5,132  
Balance, end of period 7,482 5,379  
Reserves for excess and obsolete items      
Changes in reserve for excess and obsolete items      
Amounts charged to expense 1,334 773  
Write-offs and other $ (252) $ (526)