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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Loss from operations $ (16,759) $ (17,524)
Reportable Geographical Components [Member]    
Segment Reporting Information [Line Items]    
Loss from operations (16,111) (17,017)
Intercompany Sales [Member]    
Segment Reporting Information [Line Items]    
Loss from operations (648) (507)
Americas [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Loss from operations (14,186) (23,106)
Germany [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Loss from operations 1,011 1,840
Other EMEA [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Loss from operations (8,118) (1,335)
Asia Pacific [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Loss from operations $ 5,182 $ 5,584