Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Product Information [Line Items]
Total revenues	$ 77,213	$ 71,087
Products [Member]
Product Information [Line Items]
Total revenues	57,542	53,345
Aortic Stent Grafts [Member]
Product Information [Line Items]
Total revenues	25,506	20,205
Surgical Sealants [Member]
Product Information [Line Items]
Total revenues	15,681	17,828
On-X [Member]
Product Information [Line Items]
Total revenues	14,371	13,095
Other [Member]
Product Information [Line Items]
Total revenues	1,984	2,217
Preservation Services [Member]
Product Information [Line Items]
Total revenues	19,671	17,742
Operating Segments [Member] | Products [Member]
Product Information [Line Items]
Total revenues	$ 57,542	$ 53,345