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Inventories - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 21,320 $ 22,514
Work-in-process 31,606 31,164
Finished goods 6,897 5,907
Supplies 10,813 11,084
Total Inventory $ 70,636 $ 70,669