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Segment Information (Schedule Of Income (Loss) From Operations By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income (loss) from operations $ (6,864) $ (3,717) $ (15,935) $ (20,476)
Reportable Geographical Components [Member]        
Income (loss) from operations (6,299) (2,930) (14,875) (19,041)
Intercompany Sales [Member]        
Income (loss) from operations (565) (787) (1,060) (1,435)
Americas [Member] | Operating Segments [Member]        
Income (loss) from operations (15,639) (4,747) (29,089) (18,933)
Germany [Member] | Operating Segments [Member]        
Income (loss) from operations (272) 3,960 1,785 4,971
Other EMEA [Member] | Operating Segments [Member]        
Income (loss) from operations 3,780 (8,064) 2,256 (16,182)
Asia Pacific [Member] | Operating Segments [Member]        
Income (loss) from operations $ 5,832 $ 5,921 $ 10,173 $ 11,103