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Summary Of Significant Accounting Policies (Schedule Of Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest $ 2,561 $ 2,446 $ 1
Income taxes 3,358 2,501 $ 145
On-X [Member]      
Issuance of common stock for acquisition of intangible assets   $ 34,593  
JOTEC [Member]      
Issuance of common stock for acquisition of intangible assets $ 53,119