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Thailand Flood-Related Items (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Thailand Flood Related Charges [Abstract]      
Thailand flood-related items, net of insurance $ (1,571)bhe_FloodRelatedItemsNetOfInsurance $ (41,325)bhe_FloodRelatedItemsNetOfInsurance $ 9,028bhe_FloodRelatedItemsNetOfInsurance