Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Product Information [Line Items]
Total revenues	$ 87,854	$ 76,838	$ 260,334	$ 234,391
Products
Product Information [Line Items]
Total revenues	63,747	55,248	192,041	171,726
Aortic stent grafts
Product Information [Line Items]
Total revenues	25,523	19,674	80,032	69,013
On-X
Product Information [Line Items]
Total revenues	18,744	16,456	54,346	47,082
Surgical sealants
Product Information [Line Items]
Total revenues	16,234	17,374	49,503	49,022
Other
Product Information [Line Items]
Total revenues	3,246	1,744	8,160	6,609
Preservation services
Product Information [Line Items]
Total revenues	$ 24,107	$ 21,590	$ 68,293	$ 62,665