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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory, Net [Abstract]    
Raw materials $ 33,311 $ 41,142
Work-in-process 14,757 15,548
Finished goods 10,634 10,535
Operating and other supplies 99,836 104,736
Inventories $ 158,538 $ 171,961