Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 65,131	$ 67,881	$ 185,331	$ 206,525
Total cost of products and preservation services	21,999	22,659	62,138	70,064
Total gross margin	43,132	45,222	123,193	136,461
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	45,109	47,484	128,797	147,053
Total cost of products and preservation services	12,998	12,706	36,078	41,021
Total gross margin	32,111	34,778	92,719	106,032
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	20,022	20,397	56,534	59,472
Total cost of products and preservation services	9,001	9,953	26,060	29,043
Total gross margin	$ 11,021	$ 10,444	$ 30,474	$ 30,429