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Major Customers (Schedule Of Sales To Largest Customers) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
International Business Machines Corporation [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Sales to our largest customers | $ 312,611 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bhe_InternationalbusinessmachinescorporationmemberMember | $ 430,205 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bhe_InternationalbusinessmachinescorporationmemberMember | $ 506,126 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bhe_InternationalbusinessmachinescorporationmemberMember
Arris Group, Inc. [Member] |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |
Sales to our largest customers | $ 315,688 us-gaap_Revenues / us-gaap_MajorCustomersAxis = bhe_ArrisgroupincMember |  |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -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 1 -Article 5 + Details
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