Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Product Information [Line Items]
Total revenues	$ 97,431	$ 83,229
Products
Product Information [Line Items]
Total revenues	71,114	62,291
Aortic stent grafts
Product Information [Line Items]
Total revenues	32,103	26,150
On-X
Product Information [Line Items]
Total revenues	19,681	17,656
Surgical sealants
Product Information [Line Items]
Total revenues	16,981	16,703
Other
Product Information [Line Items]
Total revenues	2,349	1,782
Preservation services
Product Information [Line Items]
Total revenues	$ 26,317	$ 20,938