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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Inventories and supplies      
Raw materials $ 5,587   $ 5,316
Semi-finished goods 6,742   6,708
Finished goods 21,555   21,995
Supplies 6,022   6,041
Reserves for excess and obsolete items (5,379) $ (12,939) (5,132)
Inventories and supplies 34,527   $ 34,928
Change in reserves for excess and obsolete items      
Balance, beginning of year 5,132 11,748  
Amounts charged to expense 773 2,013  
Write-offs and other (526) (822)  
Balance, end of period $ 5,379 $ 12,939