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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 50,439 $ 43,364
Work-in-process 11,927 6,222
Raw materials 30,565 32,792
Total $ 92,931 $ 82,378