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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished products $ 80,118 $ 65,965
Work in process 11,971 6,169
Raw materials and supplies 140,485 124,554
Inventories at current cost 232,574 196,688
Less: LIFO valuation (40,375) (40,086)
Total inventories $ 192,199 $ 156,602