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Segment And Geographic Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Product Information [Line Items]    
Total revenues $ 67,505 $ 61,948
BioGlue And BioFoam [Member]    
Product Information [Line Items]    
Total revenues 17,222 15,970
JOTEC [Member]    
Product Information [Line Items]    
Total revenues 15,954 14,460
On-X [Member]    
Product Information [Line Items]    
Total revenues 11,731 10,309
CardioGenesis Cardiac Laser Therapy [Member]    
Product Information [Line Items]    
Total revenues 1,714 1,346
PerClot [Member]    
Product Information [Line Items]    
Total revenues 1,050 972
PhotoFix [Member]    
Product Information [Line Items]    
Total revenues 730 541
Cardiac Tissues [Member]    
Product Information [Line Items]    
Total revenues 8,930 8,103
Vascular Tissues [Member]    
Product Information [Line Items]    
Total revenues 10,174 10,247
Preservation Services [Member]    
Product Information [Line Items]    
Total revenues 19,104 18,350
Operating Segments [Member] | Total Products [Member]    
Product Information [Line Items]    
Total revenues 48,401 43,598
Operating Segments [Member] | Total Preservation Services [Member]    
Product Information [Line Items]    
Total revenues $ 19,104 $ 18,350