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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets $ 862,348 $ 893,275
Operating Segments [Member] | Americas [Member]    
Assets 359,075 384,054
Operating Segments [Member] | Germany [Member]    
Assets 39,157 36,782
Operating Segments [Member] | Other EMEA [Member]    
Assets 343,194 369,302
Operating Segments [Member] | Asia Pacific [Member]    
Assets $ 120,922 $ 103,137