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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, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Number of reportable segments | segment | 1 |
Revenue from unaffiliated customers | $ 156,431 | $ 152,555
Operating Segments [Member] | Americas [Member] |  |
Revenue from unaffiliated customers | 80,291 | 83,490
Operating Segments [Member] | Germany [Member] |  |
Revenue from unaffiliated customers | 19,816 | 18,882
Operating Segments [Member] | Other EMEA [Member] |  |
Revenue from unaffiliated customers | 33,142 | 28,549
Operating Segments [Member] | Asia Pacific [Member] |  |
Revenue from unaffiliated customers | $ 23,182 | $ 21,634

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