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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Cash and cash equivalents $ 161,662 $ 184,947 $ 169,774 $ 155,643
Operating Segments [Member] | Americas [Member]        
Cash and cash equivalents 79,057 105,750    
Operating Segments [Member] | Germany [Member]        
Cash and cash equivalents 7,488 8,885    
Operating Segments [Member] | Other EMEA [Member]        
Cash and cash equivalents 42,735 35,992    
Operating Segments [Member] | Asia Pacific [Member]        
Cash and cash equivalents $ 32,382 $ 34,320