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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Assets | $ 896,764 | $ 849,153 | $ 891,959
Operating Segments [Member] | Americas [Member] |  |  |
Assets | 329,550 | 345,412 | 382,738
Operating Segments [Member] | EMEA [Member] |  |  |
Assets | 454,319 | 382,163 | 406,084
Operating Segments [Member] | Asia Pacific [Member] |  |  |
Assets | $ 112,895 | $ 121,578 | $ 103,137

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