Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Product Information [Line Items]
Total revenues	$ 47,818	$ 47,083	$ 92,877	$ 90,099
BioGlue And BioFoam [Member]
Product Information [Line Items]
Total revenues	16,683	16,187	32,364	31,503
On-X [Member]
Product Information [Line Items]
Total revenues	9,862	9,554	18,722	16,269
CardioGenesis Cardiac Laser Therapy [Member]
Product Information [Line Items]
Total revenues	2,056	1,860	3,641	3,844
PerClot [Member]
Product Information [Line Items]
Total revenues	936	1,042	1,755	2,033
PhotoFix [Member]
Product Information [Line Items]
Total revenues	557	490	1,008	871
HeRO Graft [Member]
Product Information [Line Items]
Total revenues		912		2,325
ProCol [Member]
Product Information [Line Items]
Total revenues				218
Cardiac Tissues [Member]
Product Information [Line Items]
Total revenues	8,477	7,548	15,979	13,976
Vascular Tissues [Member]
Product Information [Line Items]
Total revenues	9,247	9,490	19,408	19,060
Operating Segments [Member] | Total Products [Member]
Product Information [Line Items]
Total revenues	30,094	30,045	57,490	57,063
Operating Segments [Member] | Total Preservation Services [Member]
Product Information [Line Items]
Total revenues	$ 17,724	$ 17,038	$ 35,387	$ 33,036