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Borrowing Facilities (Details) In Millions, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 U.S. Credit Agreement [Member] USD ($) | Dec. 31, 2014 U.S. Credit Agreement [Member] USD ($) | Mar. 31, 2015 Thailand Subsidiary [Member] THB | Mar. 31, 2015 Minimum [Member] U.S. Credit Agreement [Member] | Mar. 31, 2015 Maximum [Member] U.S. Credit Agreement [Member] | Mar. 31, 2015 LIBOR Plus [Member] Minimum [Member] U.S. Credit Agreement [Member] | Mar. 31, 2015 LIBOR Plus [Member] Maximum [Member] U.S. Credit Agreement [Member] | Mar. 31, 2015 Prime Rate Plus [Member] Minimum [Member] U.S. Credit Agreement [Member] | Mar. 31, 2015 Prime Rate Plus [Member] Maximum [Member] U.S. Credit Agreement [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility | $ 200 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  | 350 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |  |  |
Revolving credit facility, term period | 5 years |  |  |  |  |  |  |  |
U.S. revolving credit facility, maturity date | Jul. 30, 2017 |  |  |  |  |  |  |  |
Possible increase to the borrowing capacity of U.S. credit agreement | 100 bhe_PossibleIncreaseToBorrowingCapacityOfCreditAgreement / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = bhe_LiborPlusMember | 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = bhe_LiborPlusMember | 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = bhe_PrimeRatePlusMember | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = bhe_PrimeRatePlusMember
U.S. Credit facility, commitment fee |  |  |  | 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.40%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Letters of credit outstanding amount | 1.2 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember | 1.2 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  |  |  |  |  |  |
U.S. Credit facility, available for future borrowings | $ 198.8 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember | $ 198.8 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  |  |  |  |  |  |
U.S. Credit agreement, secured by percentage of stock of the Company's domestic subsidiaries | 100.00%bhe_PercentageOfDomesticSubsidiariesStockUsedToSecureCreditAgreement / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  |  |  |  |  |  |  |
U.S. Credit agreement, secured by percentage of voting capital stock of each direct foreign subsidiary | 65.00%bhe_PercentageOfDirectForeignSubsidiariesVotingCapitalStockUsedToSecureCreditAgreement / us-gaap_CreditFacilityAxis = bhe_USCreditAgreementMember |  |  |  |  |  |  |  |

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- Definition Line of credit facility, term period + References No definition available. + Details
Name: | bhe_LineOfCreditFacilityTermPeriod
Namespace Prefix: | bhe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Direct Foreign Subsidiaries Voting Capital Stock, Used To Secure Credit Agreement + References No definition available. + Details
Name: | bhe_PercentageOfDirectForeignSubsidiariesVotingCapitalStockUsedToSecureCreditAgreement
Namespace Prefix: | bhe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Domestic Subsidiaries Stock, Used To Secure Credit Agreement + References No definition available. + Details
Name: | bhe_PercentageOfDomesticSubsidiariesStockUsedToSecureCreditAgreement
Namespace Prefix: | bhe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Possible increase to the borrowing capacity of credit agreement + References No definition available. + Details
Name: | bhe_PossibleIncreaseToBorrowingCapacityOfCreditAgreement
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant