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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials and supplies $ 131,817 $ 113,632
Work in process 29,172 24,290
Finished products 87,561 81,263
Inventory reserves (39,244) (37,233)
Total Inventory $ 209,306 $ 181,952