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Supplemental balance sheet and cash flow information (inventories and supplies) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Inventories and supplies    
Finished and semi-finished goods $ 32,646 $ 34,194
Raw materials and supplies 16,762 17,339
Reserve for excess and obsolete items (10,743) (9,445)
Inventories and supplies, net of reserve $ 38,665 $ 42,088