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Inventories And Deferred Preservation Costs (Schedule Of Deferred Preservation Costs) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Total deferred preservation costs $ 32,352 $ 33,174
Cardiac Tissues [Member]    
Total deferred preservation costs 15,512 15,972
Vascular Tissues [Member]    
Total deferred preservation costs $ 16,840 $ 17,202