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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and supplies $ 119,287 $ 120,811
Work in process 29,440 22,979
Finished products 85,336 80,118
Inventory reserves (36,534) (34,040)
Total Inventory $ 197,529 $ 189,868