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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 162,130 $ 173,140
Work in process 30,200 31,880
Raw materials 70,480 65,670
Total inventories $ 262,810 $ 270,690