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Ransomware Incident (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Ransomware incident |  |  |
Ransomware related incident costs, net | $ 7,681 | $ 0 | $ 0
Insurance recoveries | $ 5,000 | $ 0 | $ 0

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- Definition The amount of costs associated with systems affected by a ransomware incident that encrypted information on our systems and disrupted customer and employee access to our systems and services. + References No definition available. + Details
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Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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