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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventories    
Raw materials and supplies $ 128,809 $ 121,573
Work in process 33,133 29,725
Finished products 88,614 81,536
Inventory reserves (45,834) (41,967)
Total Inventory $ 204,722 $ 190,867