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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventories [Abstract]    
Raw materials and supplies $ 127,525 $ 121,573
Work in process 30,498 29,725
Finished products 90,352 81,536
Inventory reserves 43,452 41,967
Total Inventory $ 204,923 $ 190,867