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Inventories (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Inventories    
Raw materials and supplies $ 121,701 $ 113,415
Work in process 32,932 26,358
Finished products 93,458 71,302
Inventory reserves (36,404) (32,516)
Total Inventory $ 211,687 $ 178,559