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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Product Information [Line Items] |  |  |  |
Total revenues | $ 76,148 | $ 53,771 | $ 147,235 | $ 120,200
Products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 56,076 | 37,268 | 109,421 | 83,688
Aortic Stents And Stent Grafts [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 21,064 | 13,174 | 41,269 | 28,642
Surgical Sealants [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 17,864 | 12,437 | 35,692 | 29,174
On-X [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 14,726 | 10,116 | 27,821 | 22,318
Other [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 2,422 | 1,541 | 4,639 | 3,554
Preservation Services [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | 20,072 | 16,503 | 37,814 | 36,512
Operating Segments [Member] | Products [Member] |  |  |  |
Product Information [Line Items] |  |  |  |
Total revenues | $ 56,076 | $ 37,268 | $ 109,421 | $ 83,688

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