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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Product Information [Line Items]        
Total revenues $ 43,999 $ 45,252 $ 136,876 $ 135,351
BioGlue And BioFoam [Member]        
Product Information [Line Items]        
Total revenues 15,730 15,976 48,094 47,479
On-X [Member]        
Product Information [Line Items]        
Total revenues 8,326 8,890 27,048 25,159
CardioGenesis Cardiac Laser Therapy [Member]        
Product Information [Line Items]        
Total revenues 1,489 1,653 5,130 5,497
PerClot [Member]        
Product Information [Line Items]        
Total revenues 886 950 2,641 2,983
PhotoFix [Member]        
Product Information [Line Items]        
Total revenues 598 535 1,606 1,406
HeRO Graft [Member]        
Product Information [Line Items]        
Total revenues       2,325
ProCol [Member]        
Product Information [Line Items]        
Total revenues       218
Cardiac Tissues [Member]        
Product Information [Line Items]        
Total revenues 7,932 8,279 23,911 22,255
Vascular Tissues [Member]        
Product Information [Line Items]        
Total revenues 9,038 8,969 28,446 28,029
Operating Segments [Member] | Total Products [Member]        
Product Information [Line Items]        
Total revenues 27,029 28,004 84,519 85,067
Operating Segments [Member] | Total Preservation Services [Member]        
Product Information [Line Items]        
Total revenues $ 16,970 $ 17,248 $ 52,357 $ 50,284