Segment Information (Summary Of Net Revenues By Product And Service) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Product Information [Line Items]
Total revenues	$ 68,496	$ 47,818	$ 130,444	$ 92,877
BioGlue And BioFoam [Member]
Product Information [Line Items]
Total revenues	17,069	16,683	33,039	32,364
JOTEC [Member]
Product Information [Line Items]
Total revenues	17,205		31,665
On-X [Member]
Product Information [Line Items]
Total revenues	11,888	9,862	22,197	18,722
CardioGenesis Cardiac Laser Therapy [Member]
Product Information [Line Items]
Total revenues	1,578	2,056	2,924	3,641
PerClot [Member]
Product Information [Line Items]
Total revenues	968	936	1,940	1,755
PhotoFix [Member]
Product Information [Line Items]
Total revenues	605	557	1,146	1,008
Cardiac Tissues [Member]
Product Information [Line Items]
Total revenues	9,055	8,477	17,158	15,979
Vascular Tissues [Member]
Product Information [Line Items]
Total revenues	10,128	9,247	20,375	19,408
Preservation Services [Member]
Product Information [Line Items]
Total revenues	19,183	17,724	37,533	35,387
Operating Segments [Member] | Total Products [Member]
Product Information [Line Items]
Total revenues	49,313	30,094	92,911	57,490
Operating Segments [Member] | Total Preservation Services [Member]
Product Information [Line Items]
Total revenues	$ 19,183	$ 17,724	$ 37,533	$ 35,387