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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product Information [Line Items]    
Total revenues $ 45,059 $ 43,016
BioGlue And BioFoam [Member]    
Product Information [Line Items]    
Total revenues 15,681 15,316
On-X [Member]    
Product Information [Line Items]    
Total revenues 8,860 6,715
CardioGenesis Cardiac Laser Therapy [Member]    
Product Information [Line Items]    
Total revenues 1,585 1,984
PerClot [Member]    
Product Information [Line Items]    
Total revenues 819 991
PhotoFix [Member]    
Product Information [Line Items]    
Total revenues 451 381
HeRO Graft [Member]    
Product Information [Line Items]    
Total revenues   1,413
ProCol [Member]    
Product Information [Line Items]    
Total revenues   218
Cardiac Tissues [Member]    
Product Information [Line Items]    
Total revenues 7,502 6,428
Vascular Tissues [Member]    
Product Information [Line Items]    
Total revenues 10,161 9,570
Operating Segments [Member] | Total Products [Member]    
Product Information [Line Items]    
Total revenues 27,396 27,018
Operating Segments [Member] | Total Preservation Services [Member]    
Product Information [Line Items]    
Total revenues $ 17,663 $ 15,998