Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 71,087	$ 66,429
Total cost of products and preservation services	23,249	22,258
Total gross margin	47,838	44,171
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	53,345	46,420
Total cost of products and preservation services	14,911	13,040
Total gross margin	38,434	33,380
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	17,742	20,009
Total cost of products and preservation services	8,338	9,218
Total gross margin	$ 9,404	$ 10,791