Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Product Information [Line Items]
Total revenues	$ 80,340	$ 76,148	$ 157,553	$ 147,235
Products
Product Information [Line Items]
Total revenues	58,936	56,076	116,478	109,421
Aortic stent grafts
Product Information [Line Items]
Total revenues	23,833	21,064	49,339	41,269
Surgical sealants
Product Information [Line Items]
Total revenues	15,967	17,864	31,648	35,692
On-X
Product Information [Line Items]
Total revenues	16,255	14,726	30,626	27,821
Other
Product Information [Line Items]
Total revenues	2,881	2,422	4,865	4,639
Preservation services
Product Information [Line Items]
Total revenues	$ 21,404	$ 20,072	$ 41,075	$ 37,814