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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Loss from operations $ (32,335) $ (22,017) $ (48,270) $ (42,493)
Reportable Geographical Components [Member]        
Loss from operations (31,946) (21,373) (46,821) (40,414)
Intercompany Sales [Member]        
Loss from operations (389) (644) (1,449) (2,079)
Americas [Member] | Operating Segments [Member]        
Loss from operations (34,255) (21,525) (63,344) (40,458)
Germany [Member] | Operating Segments [Member]        
Loss from operations 193 2,761 1,978 7,732
Other EMEA [Member] | Operating Segments [Member]        
Loss from operations (1,775) (11,043) 481 (27,225)
Asia Pacific [Member] | Operating Segments [Member]        
Loss from operations $ 3,891 $ 8,434 $ 14,064 $ 19,537