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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished goods $ 77,909 $ 94,675
Raw materials 63,123 71,596
Work in process 14,605 16,975
Inventory, Net $ 155,637 $ 183,246