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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory, Net [Abstract]    
Finished goods $ 127,448 $ 116,378
Raw materials 66,648 63,244
Work in process 23,182 13,139
Inventory, Net $ 217,278 $ 192,761