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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 156,910 $ 173,140
Work in process 32,390 31,880
Raw materials 71,650 65,670
Total inventories $ 260,950 $ 270,690