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Segment Information (Schedule Of Assets By Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets $ 849,153 $ 891,959 $ 1,530,310
Americas [Member]      
Assets 345,412 382,738 1,018,113
Germany [Member]      
Assets 40,547 36,782 47,524
Other EMEA [Member]      
Assets 341,616 369,302 384,830
Asia Pacific [Member]      
Assets $ 121,578 $ 103,137 $ 79,843