Segment Information (Revenues, Cost Of Products And Services, And Gross Margins For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 71,139	$ 68,496	$ 138,644	$ 130,444
Total cost of products and preservation services	24,173	22,645	47,405	45,365
Total gross margin	46,966	45,851	91,239	85,079
Goodwill	188,106		188,106		$ 188,781
Operating Segments [Member] | Medical Devices [Member]
Segment Reporting Information [Line Items]
Total revenues	51,168	49,313	99,569	92,911
Total cost of products and preservation services	14,489	13,550	28,315	27,707
Total gross margin	36,679	35,763	71,254	65,204
Operating Segments [Member] | Preservation Services [Member]
Segment Reporting Information [Line Items]
Total revenues	19,971	19,183	39,075	37,533
Total cost of products and preservation services	9,684	9,095	19,090	17,658
Total gross margin	$ 10,287	$ 10,088	$ 19,985	$ 19,875