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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Components of Inventories |  |
Raw materials | $ 16,422 | $ 18,297
Work in process | 19,234 | 17,528
Inventories | $ 35,656 | $ 35,825

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