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Inventories (Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventory, Net [Abstract]    
Raw materials and supplies $ 202,921 $ 236,336
Work-in-process 237,880 227,139
Finished goods 157,792 151,543
Inventories, total $ 598,593 $ 615,018