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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($)
Number of reportable segments | segment |  |  | 1 |
Revenue from unaffiliated customers | $ 152,907 | $ 156,362 | $ 468,805 | $ 467,028
Operating Segments [Member] |  |  |  |
Revenue from unaffiliated customers | 152,907 | 156,362 | 468,805 | 467,028
Operating Segments [Member] | United States [Member] |  |  |  |
Revenue from unaffiliated customers | 75,402 | 84,768 | 234,195 | 246,150
Operating Segments [Member] | Other Americas [Member] |  |  |  |
Revenue from unaffiliated customers | 3,534 | 2,122 | 8,300 | 7,831
Operating Segments [Member] | Germany [Member] |  |  |  |
Revenue from unaffiliated customers | 20,761 | 16,796 | 60,908 | 56,225
Operating Segments [Member] | Other EMEA [Member] |  |  |  |
Revenue from unaffiliated customers | 31,696 | 26,948 | 97,956 | 83,704
Operating Segments [Member] | Asia Pacific [Member] |  |  |  |
Revenue from unaffiliated customers | $ 21,514 | $ 25,728 | $ 67,446 | $ 73,118

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