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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 48,889 $ 39,029
Work-in-process 14,533 14,736
Finished goods 98,677 89,446
Total inventory $ 162,099 $ 143,211