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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished goods $ 83,759 $ 77,909
Raw materials 68,590 63,123
Work in process 12,994 14,605
Inventory, Net $ 165,343 $ 155,637