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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
United States Employees, Defined Contribution [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution benefit plans | $ 4.7 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_UnitedstatesemployeesdefinedcontributionmemberMember | $ 4.1 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_UnitedstatesemployeesdefinedcontributionmemberMember | $ 3.5 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_UnitedstatesemployeesdefinedcontributionmemberMember
International Employees, Defined Contribution [Member] |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |
Defined contribution benefit plans | $ 0.2 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_ForeignpensionplansdefinedcontributionmemberMember | $ 0.2 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_ForeignpensionplansdefinedcontributionmemberMember | $ 0.1 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = bhe_ForeignpensionplansdefinedcontributionmemberMember

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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