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Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Product Information [Line Items]    
Total revenues $ 83,229 $ 77,213
Products    
Product Information [Line Items]    
Total revenues 62,291 57,542
Aortic stent grafts    
Product Information [Line Items]    
Total revenues 26,150 25,506
On-X    
Product Information [Line Items]    
Total revenues 17,656 14,371
Surgical sealants    
Product Information [Line Items]    
Total revenues 16,703 15,681
Other    
Product Information [Line Items]    
Total revenues 1,782 1,984
Preservation services    
Product Information [Line Items]    
Total revenues $ 20,938 $ 19,671