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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 75,281 $ 69,878
Work-in-progress 45,752 43,031
Finished goods 68,086 67,487
Total $ 189,119 $ 180,396