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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income (loss) from operations $ (9,071) $ (16,759)
Reportable Geographical Components [Member]    
Income (loss) from operations (8,576) (16,111)
Intercompany Sales [Member]    
Income (loss) from operations (495) (648)
Americas [Member] | Operating Segments [Member]    
Income (loss) from operations (13,450) (14,186)
Germany [Member] | Operating Segments [Member]    
Income (loss) from operations 2,057 1,011
Other EMEA [Member] | Operating Segments [Member]    
Income (loss) from operations (1,524) (8,118)
Asia Pacific [Member] | Operating Segments [Member]    
Income (loss) from operations $ 4,341 $ 5,182