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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Reconciliation of Inventories    
Raw materials $ 21,109 $ 19,719
Work in process 15,731 13,093
Finished goods 4,847 7,451
Reserve for excess and obsolete inventory (5,811) (6,642)
Total inventory $ 35,876 $ 33,621