Segment and Geographic Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Product Information [Line Items]
Total revenues	$ 354,004	$ 313,789	$ 298,836
Products
Product Information [Line Items]
Total revenues	261,185	230,353	221,597
Aortic stent grafts
Product Information [Line Items]
Total revenues	107,469	92,752	85,387
On-X
Product Information [Line Items]
Total revenues	74,528	63,904	57,363
Surgical sealants
Product Information [Line Items]
Total revenues	68,016	65,379	70,714
Other
Product Information [Line Items]
Total revenues	11,172	8,318	8,133
Preservation services
Product Information [Line Items]
Total revenues	$ 92,819	$ 83,436	$ 77,239