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Accounts Receivable Sale Program (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Receivables [Abstract] |  |
Maximum Limit Accounts Receivable Sale Program |  | $ 40.0
Trade Accounts Receivable Sold | $ 40.0 | 105.0
Amount Received From Trade Accounts Receivable Sold To Third Party | 39.9 | 104.8
Loss on sale of accounts receivable resulting from discount | $ 0.1 | $ 0.2

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- Definition Amount received upon sale of trade accounts receivable to third party. + References No definition available. + Details
Name: | bhe_AmountReceivedFromTradeAccountsReceivableSoldToThirdParty
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accounts receivable program with third party maximum amount at any time that can be sold. + References No definition available. + Details
Name: | bhe_MaximumLimitAccountsReceivableSaleProgram
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of trade accounts receivable that have been sold to a third party. + References No definition available. + Details
Name: | bhe_TradeAccountsReceivableSold
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale, the carrying amounts, net of allocated reserves, of accounts receivable transferred to a third party in a transaction that qualifies for sales treatment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107425-111719 + Details
Name: | us-gaap_GainLossOnSaleOfAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration