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Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Balance at beginning of period | $ 230,882 | $ 181,230
Acquisitions and adjustments | 331 | (31,479)
Effect of foreign currency exchange rates | (9,217) | 18,173
Balance at end of period | 221,334 | 230,882
Americas |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 0 | 0
Acquisitions and adjustments | 0 | 0
Effect of foreign currency exchange rates | 0 | 0
Balance at end of period | 0 | 0
EMEA |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 191,948 | 144,971
Acquisitions and adjustments | 331 | (31,438)
Effect of foreign currency exchange rates | (7,597) | 15,539
Balance at end of period | 184,020 | 191,948
Asia Pacific |  |
Goodwill [Roll Forward] |  |
Balance at beginning of period | 38,934 | 36,259
Acquisitions and adjustments | 0 | (41)
Effect of foreign currency exchange rates | (1,620) | 2,634
Balance at end of period | $ 37,314 | $ 38,934

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