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Goodwill And Other Intangible Assets (Schedule Of Goodwill By Reportable Segment) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Goodwill [Line Items]  
Beginning balance $ 188,305
Additional goodwill from JOTEC Acquisition 1,359
Revaluation of goodwill denominated in foreign currency 3,481
Ending balance $ 193,145