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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 169,774 $ 155,643 $ 199,896 $ 284,862
Operating Segments [Member] | Americas [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 101,186 98,913    
Operating Segments [Member] | Germany [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 9,964 3,901    
Operating Segments [Member] | Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 32,445 30,487    
Operating Segments [Member] | Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 26,179 $ 22,342