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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished goods $ 89,439 $ 77,909
Raw materials 62,635 63,123
Work in process 12,939 14,605
Inventory, Net $ 165,013 $ 155,637