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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 155,643 $ 284,862 $ 306,316 $ 155,859
Americas [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 98,913 245,219 286,377  
Germany [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 3,901 6,640 3,441  
Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 30,487 15,556 8,915  
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 22,342 $ 17,447 $ 7,583