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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Finished goods $ 38,722 $ 38,095
Work-in-process 9,592 6,047
Raw materials 22,688 25,769
Total $ 71,002 $ 69,911