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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets $ 865,630 $ 849,153
Operating Segments [Member] | Americas [Member]    
Assets 307,826 345,412
Operating Segments [Member] | Germany [Member]    
Assets 42,788 40,547
Operating Segments [Member] | Other EMEA [Member]    
Assets 398,470 341,616
Operating Segments [Member] | Asia Pacific [Member]    
Assets $ 116,546 $ 121,578