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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and cash equivalents $ 184,947 $ 155,643 $ 284,862 $ 306,316
Americas [Member]        
Cash and cash equivalents 105,750 98,913 245,219  
Germany [Member]        
Cash and cash equivalents 8,885 3,901 6,640  
Other EMEA [Member]        
Cash and cash equivalents 35,992 30,487 15,556  
Asia Pacific [Member]        
Cash and cash equivalents $ 34,320 $ 22,342 $ 17,447