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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 171,217 $ 284,862 $ 570,262 $ 306,316
Americas [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 124,534 245,219    
Germany [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 9,873 6,640    
Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 20,286 15,556    
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 16,524 $ 17,447