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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 67,881	$ 64,598	$ 206,525	$ 195,042
Total cost of products and preservation services	22,659	21,884	70,064	67,249
Total gross margin	45,222	42,714	136,461	127,793
Goodwill	183,368		183,368		$ 188,781
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	47,484	45,152	147,053	138,063
Total cost of products and preservation services	12,706	12,459	41,021	40,166
Total gross margin	34,778	32,693	106,032	97,897
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	20,397	19,446	59,472	56,979
Total cost of products and preservation services	9,953	9,425	29,043	27,083
Total gross margin	$ 10,444	$ 10,021	$ 30,429	$ 29,896