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Inventories And Deferred Preservation Costs (Schedule Of Deferred Preservation Costs) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Total deferred preservation costs $ 34,808 $ 32,551
Cardiac Tissues [Member]    
Total deferred preservation costs 16,393 15,365
Vascular Tissues [Member]    
Total deferred preservation costs $ 18,415 $ 17,186