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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 86,690 $ 77,909
Raw materials 61,534 63,123
Work in process 14,509 14,605
Inventory, net $ 162,733 $ 155,637