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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials and supplies $ 132,949 $ 113,632
Work in process 27,649 24,290
Finished products 82,445 81,263
Inventory reserves (38,110) (37,233)
Total Inventory $ 204,933 $ 181,952