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Segment Information (Schedule of Assets by Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets $ 825,832 $ 896,764 $ 849,153
Americas      
Assets 284,676 329,550 345,412
EMEA      
Assets 433,326 454,319 382,163
Asia Pacific      
Assets $ 107,830 $ 112,895 $ 121,578