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Segment And Geographic Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Product Information [Line Items] |  |  |
Total revenues | $ 253,227 | $ 276,222 | $ 262,841
Products [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 179,299 | 197,246 | 187,394
BioGlue [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 62,068 | 68,611 | 66,660
Aortic Stents And Stent Grafts [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 61,663 | 64,974 | 63,341
On-X [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 48,053 | 50,096 | 44,832
PhotoFix [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 4,169 | 3,754 | 2,577
PerClot [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 2,882 | 3,795 | 3,767
CardioGenesis Cardiac Laser Therapy [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 464 | 6,016 | 6,217
Preservation Services [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 73,928 | 78,976 | 75,447
Cardiac Tissues [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 37,893 | 40,879 | 35,683
NeoPatch [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | 183 |  |
Vascular Tissues [Member] |  |  |
Product Information [Line Items] |  |  |
Total revenues | $ 35,852 | $ 38,097 | $ 39,764

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