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Inventories (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Inventories [Abstract]    
Raw materials $ 33,200,000 $ 30,800,000
Work-in-process 7,200,000 6,500,000
Finished goods 27,500,000 26,500,000
Packaging and supplies 21,100,000 20,800,000
Total inventories $ 89,044,000 $ 84,569,000