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Reclassification Out Of Accumulated Other Comprehensive Loss (Schedule Of Reclassification Out Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charge and other |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,547)bhe_Assetimpairmentchargeandother | $ 2,606 bhe_Assetimpairmentchargeandother | $ 0 bhe_Assetimpairmentchargeandother
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  | (452)us-gaap_OtherNonoperatingIncomeExpense | (101)us-gaap_OtherNonoperatingIncomeExpense | 154 us-gaap_OtherNonoperatingIncomeExpense
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | 115,700 us-gaap_SellingGeneralAndAdministrativeExpense | 99,331 us-gaap_SellingGeneralAndAdministrativeExpense | 89,951 us-gaap_SellingGeneralAndAdministrativeExpense
Net of tax | 24,011 us-gaap_NetIncomeLoss | 17,156 us-gaap_NetIncomeLoss | 22,150 us-gaap_NetIncomeLoss | 19,125 us-gaap_NetIncomeLoss | 67,489 us-gaap_NetIncomeLoss | 23,726 us-gaap_NetIncomeLoss | 8,457 us-gaap_NetIncomeLoss | 11,487 us-gaap_NetIncomeLoss | 18,115 us-gaap_NetIncomeLoss | 19,314 us-gaap_NetIncomeLoss | 13,580 us-gaap_NetIncomeLoss | 5,598 us-gaap_NetIncomeLoss | 82,442 us-gaap_NetIncomeLoss | 111,159 us-gaap_NetIncomeLoss | 56,607 us-gaap_NetIncomeLoss
Foreign currency translaction adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 2,930 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Foreign currency translaction adjustments [Member] | Disposal Of Tianjin Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charge and other |  |  |  |  |  |  |  |  |  |  |  |  | 2,979 bhe_Assetimpairmentchargeandother / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = bhe_DisposalOfTianjinSubsidiaryMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Foreign currency translaction adjustments [Member] | Foreign Currency Translations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  | (49)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = bhe_ForeignCurrencyTranslationsMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (30)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = bhe_OtherComprehensiveLossMember |  |
Other [Member] | Actuarial Net Gains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ (30)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = bhe_ActuarialNetGainsMember / us-gaap_StatementEquityComponentsAxis = bhe_OtherComprehensiveLossMember |  |

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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