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Inventories (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Finished goods available for resale    
Raw materials $ 21,000,000 $ 13,700,000
Work in process 1,200,000 600,000
Finished goods 196,800,000 168,200,000
Total $ 219,034,000 $ 182,467,000