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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventories [Abstract]    
Raw materials and supplies $ 119,042 $ 120,811
Work in process 24,512 22,979
Finished products 84,086 80,118
Inventory reserves (36,250) (34,040)
Total Inventory $ 191,390 $ 189,868