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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Inventory Disclosure [Abstract]      
Raw materials $ 89,903 $ 95,575 $ 91,850
In-process products 19,464 23,672 24,690
Finished products 146,353 132,660 155,919
Total inventories $ 255,720 $ 251,907 $ 272,459