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Inventories (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Inventories      
Raw materials $ 66,016 $ 61,996 $ 61,238
In-process products 19,885 18,364 18,729
Finished products 81,033 71,937 70,819
Total inventories $ 166,934 $ 152,297 $ 150,786