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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Number of reportable segments | segment | 1 |
Revenue from unaffiliated customers | $ 165,888 | $ 156,431
United States |  |
Revenue from unaffiliated customers | 82,730 | 77,872
Other Americas |  |
Revenue from unaffiliated customers | 1,817 | 2,419
EMEA |  |
Revenue from unaffiliated customers | 57,416 | 52,958
Asia Pacific |  |
Revenue from unaffiliated customers | $ 23,925 | $ 23,182

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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=63488584&loc=d3e20235-122688 + Details
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