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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Revenue from unaffiliated customers $ 152,555 $ 160,722
Operating Segments [Member] | Americas [Member]    
Segment Reporting Information [Line Items]    
Revenue from unaffiliated customers 83,490 86,262
Operating Segments [Member] | Germany [Member]    
Segment Reporting Information [Line Items]    
Revenue from unaffiliated customers 18,882 21,250
Operating Segments [Member] | Other EMEA [Member]    
Segment Reporting Information [Line Items]    
Revenue from unaffiliated customers 28,549 27,454
Operating Segments [Member] | Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Revenue from unaffiliated customers $ 21,634 $ 25,756