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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products $ 79,059 $ 66,064
Work in process 7,542 10,141
Raw materials and supplies 130,509 117,388
Inventories at current cost 217,110 193,593
Less: LIFO valuation (39,854) (39,854)
Total inventories $ 177,256 $ 153,739