Segment And Geographic Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Information [Line Items]
Total revenues	$ 298,836	$ 253,227	$ 276,222
Products [Member]
Product Information [Line Items]
Total revenues	221,597	179,299	197,246
Aortic Stents And Stent Grafts [Member]
Product Information [Line Items]
Total revenues	85,387	61,663	64,974
Surgical Sealants [Member]
Product Information [Line Items]
Total revenues	70,714	62,068	68,611
On-X [Member]
Product Information [Line Items]
Total revenues	57,363	48,053	50,096
Other [Member]
Product Information [Line Items]
Total revenues	8,133	7,515	13,565
Preservation Services [Member]
Product Information [Line Items]
Total revenues	$ 77,239	$ 73,928	$ 78,976