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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products $ 75,192 $ 66,064
Work in process 7,571 10,141
Raw materials and supplies 128,294 117,388
Inventories at current cost 211,057 193,593
Less: LIFO valuation (39,854) (39,854)
Total inventories $ 171,203 $ 153,739