Inventories And Deferred Preservation Costs (Schedule Of Deferred Preservation Costs) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
Total deferred preservation costs	$ 26,002	$ 24,741
Cardiac Tissues [Member]
Inventory [Line Items]
Total deferred preservation costs	13,065	11,722
Vascular Tissues [Member]
Inventory [Line Items]
Total deferred preservation costs	$ 12,937	$ 13,019