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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Revenue from unaffiliated customers | $ 177,264 | $ 152,907 | $ 159,467 | $ 156,431 | $ 165,937 | $ 156,362 | $ 158,111 | $ 152,555 | $ 183,363 | $ 151,574 | $ 170,504 | $ 160,722 | $ 646,069 | $ 632,965 | $ 666,163
Operating Segments [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 322,399 | 329,553 | 345,032
Operating Segments [Member] | Other Americas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 11,377 | 11,332 | 12,944
Operating Segments [Member] | EMEA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 220,357 | 193,141 | 200,104
Operating Segments [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 91,936 | $ 98,939 | $ 108,083

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