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Goodwill And Other Intangible Assets (Schedule Of Carrying Values Of Indefinite Lived Intangible Assets)(Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 188,305 $ 78,294 $ 11,365
In Process R&D [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Total indefinite lived intangible assets 13,954    
Procurement Contracts And Agreements [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Total indefinite lived intangible assets 2,013 2,013  
Trademarks [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Total indefinite lived intangible assets $ 841 $ 841