Segment And Geographic Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 253,227	$ 276,222	$ 262,841
Total cost of products and preservation services	85,443	93,209	89,857
Total gross margin	167,784	183,013	172,984
Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	179,299	197,246	187,394
Total cost of products and preservation services	50,128	55,022	53,772
Total gross margin	129,171	142,224	133,622
Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	73,928	78,976	75,447
Total cost of products and preservation services	35,315	38,187	36,085
Total gross margin	$ 38,613	$ 40,789	$ 39,362