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Goodwill and Other Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Goodwill $ 192,116 $ 191,616
Acquisitions 500  
Americas [Member]    
Goodwill [Line Items]    
Goodwill 154,014 153,514
Acquisitions 500  
Asia [Member]    
Goodwill [Line Items]    
Goodwill 38,102 $ 38,102
Acquisitions $ 0