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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Product Information [Line Items]    
Total revenues $ 61,948 $ 45,059
BioGlue And BioFoam [Member]    
Product Information [Line Items]    
Total revenues 15,970 15,681
JOTEC [Member]    
Product Information [Line Items]    
Total revenues 14,460  
On-X [Member]    
Product Information [Line Items]    
Total revenues 10,309 8,860
CardioGenesis Cardiac Laser Therapy [Member]    
Product Information [Line Items]    
Total revenues 1,346 1,585
PerClot [Member]    
Product Information [Line Items]    
Total revenues 972 819
PhotoFix [Member]    
Product Information [Line Items]    
Total revenues 541 451
Cardiac Tissues [Member]    
Product Information [Line Items]    
Total revenues 8,103 7,502
Vascular Tissues [Member]    
Product Information [Line Items]    
Total revenues 10,247 10,161
Operating Segments [Member] | Total Products [Member]    
Product Information [Line Items]    
Total revenues 43,598 27,396
Operating Segments [Member] | Total Preservation Services [Member]    
Product Information [Line Items]    
Total revenues $ 18,350 $ 17,663