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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, 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, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Revenue from unaffiliated customers | $ 165,937 | $ 156,362 | $ 158,111 | $ 152,555 | $ 183,363 | $ 151,574 | $ 170,504 | $ 160,722 | $ 187,438 | $ 166,944 | $ 151,512 | $ 147,758 | $ 632,965 | $ 666,163 | $ 653,652
Operating Segments [Member] | Americas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 340,885 | 357,976 | 333,925
Operating Segments [Member] | Germany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 78,979 | 82,872 | 87,021
Operating Segments [Member] | Other EMEA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | 114,162 | 117,232 | 109,066
Operating Segments [Member] | Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from unaffiliated customers |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,939 | $ 108,083 | $ 123,640

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