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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Reconciliation of Inventories    
Raw materials $ 20,413 $ 20,645
Work in process 16,884 14,198
Finished goods 4,820 4,461
Reserve for excess and obsolete inventory (5,640) (5,346)
Total inventory $ 36,477 $ 33,958