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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Net of Reserves $ 8,390 $ 12,447
Inventory, Work in Process, Net of Reserves 104,755 88,643
Inventory, Finished Goods, Net of Reserves 50,735 51,631
Total inventories $ 163,880 $ 152,721