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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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