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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Inventories and supplies      
Raw materials $ 12,028   $ 11,563
Semi-finished goods 6,098   7,777
Finished goods 37,836   32,938
Supplies 7,062   6,389
Reserve for excess and obsolete items (8,125) $ (5,437) (6,400)
Inventories and supplies 54,899   $ 52,267
Changes in reserve for excess and obsolete items      
Balance, beginning of year 6,400 5,132  
Balance, end of period 8,125 5,437  
Reserves for excess and obsolete items      
Changes in reserve for excess and obsolete items      
Amounts charged to expense 2,151 1,516  
Write-offs and other $ (426) $ (1,211)