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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished products $ 75,164 $ 65,965
Work in process 8,517 6,169
Raw materials and supplies 129,248 124,554
Inventories at current cost 212,929 196,688
Less: LIFO valuation (40,266) (40,086)
Total inventories $ 172,663 $ 156,602