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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventories    
Raw materials and supplies $ 131,367 $ 119,550
Work in process 30,529 31,085
Finished products 89,293 89,334
Inventory reserves (37,169) (35,211)
Total Inventory $ 214,020 $ 204,758