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Goodwill (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Balance at beginning of period | $ 181,230 | $ 187,875
Acquisitions and adjustments | 31,479 | 52
Effect of foreign currency exchange rates | 18,173 | (6,697)
Balance at end of period | 230,882 | 181,230
Americas [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period |  |
Acquisitions and adjustments |  |
Effect of foreign currency exchange rates |  |
Balance at end of period |  |
EMEA [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 144,971 | 150,521
Acquisitions and adjustments | 31,438 |
Acquisitions and adjustments |  | (137)
Effect of foreign currency exchange rates | 15,539 | (5,413)
Balance at end of period | 191,948 | 144,971
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Balance at beginning of period | 36,259 | 37,354
Acquisitions and adjustments | 41 | 189
Effect of foreign currency exchange rates | 2,634 | (1,284)
Balance at end of period | $ 38,934 | $ 36,259

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