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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventories    
Raw materials and supplies $ 125,415 $ 121,573
Work in process 31,265 29,725
Finished products 85,929 81,536
Inventory reserves (42,586) (41,967)
Total Inventory $ 200,023 $ 190,867