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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished products $ 62,011 $ 54,348
Work in process 7,611 6,542
Raw materials and supplies 89,892 84,069
Inventories at current cost 159,514 144,959
Less: LIFO valuation (41,893) (41,893)
Total inventories $ 117,621 $ 103,066