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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Finished goods $ 173,140 $ 159,550
Work in process 31,880 29,270
Raw materials 65,670 49,200
Total inventories $ 270,690 $ 238,020