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Net Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished goods $ 29,797 $ 30,262
Work in process 31,990 23,533
Raw materials 22,580 12,352
Supplies 5,598 5,074
Total 89,965 71,221
Inventory reserves $ 11,496 $ 11,839