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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventories [Abstract]    
Finished goods $ 55,678 $ 45,734
Work-in-process 1,182 891
Raw materials and supplies 11,054 7,429
Inventories $ 67,914 $ 54,054